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stm32: csi: addition of the STM32 CSI driver Message-ID: References: <20241212-csi_dcmipp_mp25-v4-0-fbeb55a05ed7@foss.st.com> <20241212-csi_dcmipp_mp25-v4-3-fbeb55a05ed7@foss.st.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241212-csi_dcmipp_mp25-v4-3-fbeb55a05ed7@foss.st.com> Hi Alain, On Thu, Dec 12, 2024 at 10:17:27AM +0100, Alain Volmat wrote: > The STM32 CSI controller is tightly coupled with the DCMIPP and act as an > input stage to receive data coming from the sensor and transferring > them into the DCMIPP. > > Signed-off-by: Alain Volmat > > --- > v3: get reset controller within probe function and remove it > from the driver structure > use devm_clk_bulk apis rather 3 separate clks > > v2: correct data-lanes handling, using values 1 & 2 > update yaml filename in MAINTAINERS > --- > MAINTAINERS | 8 + > drivers/media/platform/st/stm32/Kconfig | 14 + > drivers/media/platform/st/stm32/Makefile | 1 + > drivers/media/platform/st/stm32/stm32-csi.c | 1137 +++++++++++++++++++++++++++ > 4 files changed, 1160 insertions(+) > > diff --git a/MAINTAINERS b/MAINTAINERS > index 1e930c7a58b1..2ffa10e38e52 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -14495,6 +14495,14 @@ W: https://linuxtv.org > T: git git://linuxtv.org/media.git > F: drivers/media/dvb-frontends/stv6111* > > +MEDIA DRIVERS FOR STM32 - CSI > +M: Alain Volmat > +L: linux-media@vger.kernel.org > +S: Supported > +T: git git://linuxtv.org/media_tree.git > +F: Documentation/devicetree/bindings/media/st,stm32mp25-csi.yaml > +F: drivers/media/platform/stm32/stm32-csi.c > + > MEDIA DRIVERS FOR STM32 - DCMI / DCMIPP > M: Hugues Fruchet > M: Alain Volmat > diff --git a/drivers/media/platform/st/stm32/Kconfig b/drivers/media/platform/st/stm32/Kconfig > index 9df9a2a17728..f12e67bcc9bc 100644 > --- a/drivers/media/platform/st/stm32/Kconfig > +++ b/drivers/media/platform/st/stm32/Kconfig > @@ -1,6 +1,20 @@ > # SPDX-License-Identifier: GPL-2.0-only > > # V4L drivers > +config VIDEO_STM32_CSI > + tristate "STM32 Camera Serial Interface (CSI) support" > + depends on V4L_PLATFORM_DRIVERS > + depends on VIDEO_DEV && OF > + depends on ARCH_STM32 || COMPILE_TEST > + select MEDIA_CONTROLLER > + select V4L2_FWNODE > + help > + This module makes the STM32 Camera Serial Interface (CSI) > + available as a v4l2 device. > + > + To compile this driver as a module, choose M here: the module > + will be called stm32-csi. > + > config VIDEO_STM32_DCMI > tristate "STM32 Digital Camera Memory Interface (DCMI) support" > depends on V4L_PLATFORM_DRIVERS > diff --git a/drivers/media/platform/st/stm32/Makefile b/drivers/media/platform/st/stm32/Makefile > index 7ed8297b9b19..9ae57897f030 100644 > --- a/drivers/media/platform/st/stm32/Makefile > +++ b/drivers/media/platform/st/stm32/Makefile > @@ -1,4 +1,5 @@ > # SPDX-License-Identifier: GPL-2.0-only > +obj-$(CONFIG_VIDEO_STM32_CSI) += stm32-csi.o > obj-$(CONFIG_VIDEO_STM32_DCMI) += stm32-dcmi.o > obj-$(CONFIG_VIDEO_STM32_DCMIPP) += stm32-dcmipp/ > stm32-dma2d-objs := dma2d/dma2d.o dma2d/dma2d-hw.o > diff --git a/drivers/media/platform/st/stm32/stm32-csi.c b/drivers/media/platform/st/stm32/stm32-csi.c > new file mode 100644 > index 000000000000..48941aae8c9b > --- /dev/null > +++ b/drivers/media/platform/st/stm32/stm32-csi.c > @@ -0,0 +1,1137 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Driver for STM32 Camera Serial Interface > + * > + * Copyright (C) STMicroelectronics SA 2024 > + * Author: Alain Volmat > + * for STMicroelectronics. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include > +#include > +#include > + > +#define STM32_CSI_CR 0x0000 > +#define STM32_CSI_CR_CSIEN BIT(0) > +#define STM32_CSI_CR_VCXSTART(x) BIT(2 + ((x) * 4)) > +#define STM32_CSI_CR_VCXSTOP(x) BIT(3 + ((x) * 4)) > +#define STM32_CSI_PCR 0x0004 > +#define STM32_CSI_PCR_DL1EN BIT(3) > +#define STM32_CSI_PCR_DL0EN BIT(2) > +#define STM32_CSI_PCR_CLEN BIT(1) > +#define STM32_CSI_PCR_PWRDOWN BIT(0) > +#define STM32_CSI_VCXCFGR1(x) ((((x) + 1) * 0x0010) + 0x0) > +#define STM32_CSI_VCXCFGR1_ALLDT BIT(0) > +#define STM32_CSI_VCXCFGR1_DT0EN BIT(1) > +#define STM32_CSI_VCXCFGR1_DT1EN BIT(2) > +#define STM32_CSI_VCXCFGR1_CDTFT_SHIFT 8 > +#define STM32_CSI_VCXCFGR1_DT0_SHIFT 16 > +#define STM32_CSI_VCXCFGR1_DT0FT_SHIFT 24 > +#define STM32_CSI_VCXCFGR2(x) ((((x) + 1) * 0x0010) + 0x4) > +#define STM32_CSI_VCXCFGR2_DT1_SHIFT 0 > +#define STM32_CSI_VCXCFGR2_DT1FT_SHIFT 8 > +#define STM32_CSI_INPUT_BPP8 2 > +#define STM32_CSI_INPUT_BPP10 3 > +#define STM32_CSI_INPUT_BPP12 4 > +#define STM32_CSI_INPUT_BPP14 5 > +#define STM32_CSI_LMCFGR 0x0070 > +#define STM32_CSI_LMCFGR_LANENB_SHIFT 8 > +#define STM32_CSI_LMCFGR_DLMAP_SHIFT 16 > +#define STM32_CSI_IER0 0x0080 > +#define STM32_CSI_IER1 0x0084 > +#define STM32_CSI_SR0 0x0090 > +#define STM32_CSI_SR0_SYNCERRF BIT(30) > +#define STM32_CSI_SR0_SPKTERRF BIT(28) > +#define STM32_CSI_SR0_IDERRF BIT(27) > +#define STM32_CSI_SR0_CECCERRF BIT(26) > +#define STM32_CSI_SR0_ECCERRF BIT(25) > +#define STM32_CSI_SR0_CRCERRF BIT(24) > +#define STM32_CSI_SR0_CCFIFOFF BIT(21) > +#define STM32_CSI_SR0_VCXSTATEF(x) BIT(17 + (x)) > +#define STM32_CSI_SR1 0x0094 > +#define STM32_CSI_SR1_ECTRLDL1F BIT(12) > +#define STM32_CSI_SR1_ESYNCESCDL1F BIT(11) > +#define STM32_CSI_SR1_EESCDL1F BIT(10) > +#define STM32_CSI_SR1_ESOTSYNCDL1F BIT(9) > +#define STM32_CSI_SR1_ESOTDL1F BIT(8) > +#define STM32_CSI_SR1_ECTRLDL0F BIT(4) > +#define STM32_CSI_SR1_ESYNCESCDL0F BIT(3) > +#define STM32_CSI_SR1_EESCDL0F BIT(2) > +#define STM32_CSI_SR1_ESOTSYNCDL0F BIT(1) > +#define STM32_CSI_SR1_ESOTDL0F BIT(0) > +#define STM32_CSI_FCR0 0x0100 > +#define STM32_CSI_FCR1 0x0104 > +#define STM32_CSI_SPDFR 0x0110 > +#define STM32_CSI_DT_MASK 0x3f > +#define STM32_CSI_VC_MASK 0x03 > +#define STM32_CSI_ERR1 0x0114 > +#define STM32_CSI_ERR1_IDVCERR_SHIFT 22 > +#define STM32_CSI_ERR1_IDDTERR_SHIFT 16 > +#define STM32_CSI_ERR1_CECCVCERR_SHIFT 14 > +#define STM32_CSI_ERR1_CECCDTERR_SHIFT 8 > +#define STM32_CSI_ERR1_CRCVCERR_SHIFT 6 > +#define STM32_CSI_ERR1_CRCDTERR_SHIFT 0 > +#define STM32_CSI_ERR2 0x0118 > +#define STM32_CSI_ERR2_SYNCVCERR_SHIFT 18 > +#define STM32_CSI_ERR2_SPKTVCERR_SHIFT 6 > +#define STM32_CSI_ERR2_SPKTDTERR_SHIFT 0 > +#define STM32_CSI_PRCR 0x1000 > +#define STM32_CSI_PRCR_PEN BIT(1) > +#define STM32_CSI_PMCR 0x1004 > +#define STM32_CSI_PFCR 0x1008 > +#define STM32_CSI_PFCR_CCFR_MASK GENMASK(5, 0) > +#define STM32_CSI_PFCR_CCFR_SHIFT 0 > +#define STM32_CSI_PFCR_HSFR_MASK GENMASK(14, 8) > +#define STM32_CSI_PFCR_HSFR_SHIFT 8 > +#define STM32_CSI_PFCR_DLD BIT(16) > +#define STM32_CSI_PTCR0 0x1010 > +#define STM32_CSI_PTCR0_TCKEN BIT(0) > +#define STM32_CSI_PTCR1 0x1014 > +#define STM32_CSI_PTCR1_TWM BIT(16) > +#define STM32_CSI_PTCR1_TDI_MASK GENMASK(7, 0) > +#define STM32_CSI_PTCR1_TDI_SHIFT 0 > +#define STM32_CSI_PTSR 0x1018 > + > +#define STM32_CSI_LANES_MAX 2 > + > +#define STM32_CSI_SR0_ERRORS (STM32_CSI_SR0_SYNCERRF | STM32_CSI_SR0_SPKTERRF |\ > + STM32_CSI_SR0_IDERRF | STM32_CSI_SR0_CECCERRF |\ > + STM32_CSI_SR0_ECCERRF | STM32_CSI_SR0_CRCERRF |\ > + STM32_CSI_SR0_CCFIFOFF) > +#define STM32_CSI_SR1_DL0_ERRORS (STM32_CSI_SR1_ECTRLDL0F | STM32_CSI_SR1_ESYNCESCDL0F |\ > + STM32_CSI_SR1_EESCDL0F | STM32_CSI_SR1_ESOTSYNCDL0F |\ > + STM32_CSI_SR1_ESOTDL0F) > +#define STM32_CSI_SR1_DL1_ERRORS (STM32_CSI_SR1_ECTRLDL1F | STM32_CSI_SR1_ESYNCESCDL1F |\ > + STM32_CSI_SR1_EESCDL1F | STM32_CSI_SR1_ESOTSYNCDL1F |\ > + STM32_CSI_SR1_ESOTDL1F) > +#define STM32_CSI_SR1_ERRORS (STM32_CSI_SR1_DL0_ERRORS | STM32_CSI_SR1_DL1_ERRORS) > + > +enum stm32_csi_pads { > + STM32_CSI_PAD_SINK, > + STM32_CSI_PAD_SOURCE, > + STM32_CSI_PAD_MAX, > +}; > + > +struct stm32_csi_event { > + u32 mask; > + const char * const name; > +}; > + > +static const struct stm32_csi_event stm32_csi_events_sr0[] = { > + {STM32_CSI_SR0_SYNCERRF, "Synchronization error"}, > + {STM32_CSI_SR0_SPKTERRF, "Short packet error"}, > + {STM32_CSI_SR0_IDERRF, "Data type ID error"}, > + {STM32_CSI_SR0_CECCERRF, "Corrected ECC error"}, > + {STM32_CSI_SR0_ECCERRF, "ECC error"}, > + {STM32_CSI_SR0_CRCERRF, "CRC error"}, > + {STM32_CSI_SR0_CCFIFOFF, "Clk changer FIFO full error"}, > +}; > + > +#define STM32_CSI_NUM_SR0_EVENTS ARRAY_SIZE(stm32_csi_events_sr0) > + > +static const struct stm32_csi_event stm32_csi_events_sr1[] = { > + {STM32_CSI_SR1_ECTRLDL1F, "L1: D-PHY control error"}, > + {STM32_CSI_SR1_ESYNCESCDL1F, > + "L1: D-PHY low power data transmission synchro error"}, > + {STM32_CSI_SR1_EESCDL1F, "L1: D-PHY escape entry error"}, > + {STM32_CSI_SR1_ESOTSYNCDL1F, > + "L1: Start of transmission synchro error"}, > + {STM32_CSI_SR1_ESOTDL1F, "L1: Start of transmission error"}, > + {STM32_CSI_SR1_ECTRLDL0F, "L0: D-PHY control error"}, > + {STM32_CSI_SR1_ESYNCESCDL0F, > + "L0: D-PHY low power data transmission synchro error"}, > + {STM32_CSI_SR1_EESCDL0F, "L0: D-PHY escape entry error"}, > + {STM32_CSI_SR1_ESOTSYNCDL0F, > + "L0: Start of transmission synchro error"}, > + {STM32_CSI_SR1_ESOTDL0F, "L0: Start of transmission error"}, > +}; > + > +#define STM32_CSI_NUM_SR1_EVENTS ARRAY_SIZE(stm32_csi_events_sr1) > + > +enum stm32_csi_clk { > + STM32_CSI_CLK_PCLK, > + STM32_CSI_CLK_TXESC, > + STM32_CSI_CLK_CSI2PHY, > + STM32_CSI_CLK_NB, > +}; > + > +static const char * const stm32_csi_clks_id[] = { > + "pclk", > + "txesc", > + "csi2phy", > +}; > + > +struct stm32_csi_dev { > + struct device *dev; > + > + void __iomem *base; > + > + struct clk_bulk_data clks[STM32_CSI_CLK_NB]; > + struct regulator_bulk_data supplies[2]; > + > + u8 lanes[STM32_CSI_LANES_MAX]; > + u8 num_lanes; > + > + /* > + * spinlock slock is used to protect to srX_counters tables being > + * accessed from log_status and interrupt context > + */ > + spinlock_t slock; > + > + u32 sr0_counters[STM32_CSI_NUM_SR0_EVENTS]; > + u32 sr1_counters[STM32_CSI_NUM_SR1_EVENTS]; > + > + struct v4l2_subdev sd; > + struct v4l2_async_notifier notifier; > + struct media_pad pads[STM32_CSI_PAD_MAX]; > + > + /* Remote source */ > + struct v4l2_subdev *s_subdev; > + u32 s_subdev_pad_nb; > +}; > + > +struct stm32_csi_fmts { > + u32 code; > + u32 datatype; > + u32 input_fmt; > + u8 bpp; > +}; > + > +#define FMT_MBUS_DT_DTFMT_BPP(mbus, dt, input, byteperpixel) \ > + { \ > + .code = MEDIA_BUS_FMT_##mbus, \ > + .datatype = MIPI_CSI2_DT_##dt, \ > + .input_fmt = STM32_CSI_INPUT_##input, \ > + .bpp = byteperpixel, \ > + } > +static const struct stm32_csi_fmts stm32_csi_formats[] = { > + /* YUV 422 8 bit */ > + FMT_MBUS_DT_DTFMT_BPP(UYVY8_1X16, YUV422_8B, BPP8, 8), > + FMT_MBUS_DT_DTFMT_BPP(YUYV8_1X16, YUV422_8B, BPP8, 8), > + FMT_MBUS_DT_DTFMT_BPP(YVYU8_1X16, YUV422_8B, BPP8, 8), > + FMT_MBUS_DT_DTFMT_BPP(VYUY8_1X16, YUV422_8B, BPP8, 8), > + > + /* Raw Bayer */ > + /* 8 bit */ > + FMT_MBUS_DT_DTFMT_BPP(SBGGR8_1X8, RAW8, BPP8, 8), > + FMT_MBUS_DT_DTFMT_BPP(SGBRG8_1X8, RAW8, BPP8, 8), > + FMT_MBUS_DT_DTFMT_BPP(SGRBG8_1X8, RAW8, BPP8, 8), > + FMT_MBUS_DT_DTFMT_BPP(SRGGB8_1X8, RAW8, BPP8, 8), > + /* 10 bit */ > + FMT_MBUS_DT_DTFMT_BPP(SRGGB10_1X10, RAW10, BPP10, 10), > + FMT_MBUS_DT_DTFMT_BPP(SGBRG10_1X10, RAW10, BPP10, 10), > + FMT_MBUS_DT_DTFMT_BPP(SGRBG10_1X10, RAW10, BPP10, 10), > + FMT_MBUS_DT_DTFMT_BPP(SRGGB10_1X10, RAW10, BPP10, 10), > + /* 12 bit */ > + FMT_MBUS_DT_DTFMT_BPP(SRGGB12_1X12, RAW12, BPP12, 12), > + FMT_MBUS_DT_DTFMT_BPP(SGBRG12_1X12, RAW12, BPP12, 12), > + FMT_MBUS_DT_DTFMT_BPP(SGRBG12_1X12, RAW12, BPP12, 12), > + FMT_MBUS_DT_DTFMT_BPP(SRGGB12_1X12, RAW12, BPP12, 12), > + /* 14 bit */ > + FMT_MBUS_DT_DTFMT_BPP(SRGGB14_1X14, RAW14, BPP14, 14), > + FMT_MBUS_DT_DTFMT_BPP(SGBRG14_1X14, RAW14, BPP14, 14), > + FMT_MBUS_DT_DTFMT_BPP(SGRBG14_1X14, RAW14, BPP14, 14), > + FMT_MBUS_DT_DTFMT_BPP(SRGGB14_1X14, RAW14, BPP14, 14), > + > + /* RGB 565 */ > + FMT_MBUS_DT_DTFMT_BPP(RGB565_1X16, RGB565, BPP8, 8), > + > + /* JPEG (datatype isn't used) */ > + FMT_MBUS_DT_DTFMT_BPP(JPEG_1X8, NULL, BPP8, 8), > +}; > + > +struct stm32_csi_mbps_phy_reg { > + unsigned int mbps; > + unsigned int hsfreqrange; > + unsigned int osc_freq_target; > +}; > + > +/* > + * Table describing configuration of the PHY depending on the > + * intended Bit Rate. From table 5-8 Frequency Ranges and Defaults > + * of the Synopsis DWC MIPI PHY databook > + */ > +static const struct stm32_csi_mbps_phy_reg snps_stm32mp25[] = { > + { .mbps = 80, .hsfreqrange = 0x00, .osc_freq_target = 460 }, > + { .mbps = 90, .hsfreqrange = 0x10, .osc_freq_target = 460 }, > + { .mbps = 100, .hsfreqrange = 0x20, .osc_freq_target = 460 }, > + { .mbps = 110, .hsfreqrange = 0x30, .osc_freq_target = 460 }, > + { .mbps = 120, .hsfreqrange = 0x01, .osc_freq_target = 460 }, > + { .mbps = 130, .hsfreqrange = 0x11, .osc_freq_target = 460 }, > + { .mbps = 140, .hsfreqrange = 0x21, .osc_freq_target = 460 }, > + { .mbps = 150, .hsfreqrange = 0x31, .osc_freq_target = 460 }, > + { .mbps = 160, .hsfreqrange = 0x02, .osc_freq_target = 460 }, > + { .mbps = 170, .hsfreqrange = 0x12, .osc_freq_target = 460 }, > + { .mbps = 180, .hsfreqrange = 0x22, .osc_freq_target = 460 }, > + { .mbps = 190, .hsfreqrange = 0x32, .osc_freq_target = 460 }, > + { .mbps = 205, .hsfreqrange = 0x03, .osc_freq_target = 460 }, > + { .mbps = 220, .hsfreqrange = 0x13, .osc_freq_target = 460 }, > + { .mbps = 235, .hsfreqrange = 0x23, .osc_freq_target = 460 }, > + { .mbps = 250, .hsfreqrange = 0x33, .osc_freq_target = 460 }, > + { .mbps = 275, .hsfreqrange = 0x04, .osc_freq_target = 460 }, > + { .mbps = 300, .hsfreqrange = 0x14, .osc_freq_target = 460 }, > + { .mbps = 325, .hsfreqrange = 0x25, .osc_freq_target = 460 }, > + { .mbps = 350, .hsfreqrange = 0x35, .osc_freq_target = 460 }, > + { .mbps = 400, .hsfreqrange = 0x05, .osc_freq_target = 460 }, > + { .mbps = 450, .hsfreqrange = 0x16, .osc_freq_target = 460 }, > + { .mbps = 500, .hsfreqrange = 0x26, .osc_freq_target = 460 }, > + { .mbps = 550, .hsfreqrange = 0x37, .osc_freq_target = 460 }, > + { .mbps = 600, .hsfreqrange = 0x07, .osc_freq_target = 460 }, > + { .mbps = 650, .hsfreqrange = 0x18, .osc_freq_target = 460 }, > + { .mbps = 700, .hsfreqrange = 0x28, .osc_freq_target = 460 }, > + { .mbps = 750, .hsfreqrange = 0x39, .osc_freq_target = 460 }, > + { .mbps = 800, .hsfreqrange = 0x09, .osc_freq_target = 460 }, > + { .mbps = 850, .hsfreqrange = 0x19, .osc_freq_target = 460 }, > + { .mbps = 900, .hsfreqrange = 0x29, .osc_freq_target = 460 }, > + { .mbps = 950, .hsfreqrange = 0x3a, .osc_freq_target = 460 }, > + { .mbps = 1000, .hsfreqrange = 0x0a, .osc_freq_target = 460 }, > + { .mbps = 1050, .hsfreqrange = 0x1a, .osc_freq_target = 460 }, > + { .mbps = 1100, .hsfreqrange = 0x2a, .osc_freq_target = 460 }, > + { .mbps = 1150, .hsfreqrange = 0x3b, .osc_freq_target = 460 }, > + { .mbps = 1200, .hsfreqrange = 0x0b, .osc_freq_target = 460 }, > + { .mbps = 1250, .hsfreqrange = 0x1b, .osc_freq_target = 460 }, > + { .mbps = 1300, .hsfreqrange = 0x2b, .osc_freq_target = 460 }, > + { .mbps = 1350, .hsfreqrange = 0x3c, .osc_freq_target = 460 }, > + { .mbps = 1400, .hsfreqrange = 0x0c, .osc_freq_target = 460 }, > + { .mbps = 1450, .hsfreqrange = 0x1c, .osc_freq_target = 460 }, > + { .mbps = 1500, .hsfreqrange = 0x2c, .osc_freq_target = 460 }, > + { .mbps = 1550, .hsfreqrange = 0x3d, .osc_freq_target = 285 }, > + { .mbps = 1600, .hsfreqrange = 0x0d, .osc_freq_target = 295 }, > + { .mbps = 1650, .hsfreqrange = 0x1d, .osc_freq_target = 304 }, > + { .mbps = 1700, .hsfreqrange = 0x2e, .osc_freq_target = 313 }, > + { .mbps = 1750, .hsfreqrange = 0x3e, .osc_freq_target = 322 }, > + { .mbps = 1800, .hsfreqrange = 0x0e, .osc_freq_target = 331 }, > + { .mbps = 1850, .hsfreqrange = 0x1e, .osc_freq_target = 341 }, > + { .mbps = 1900, .hsfreqrange = 0x2f, .osc_freq_target = 350 }, > + { .mbps = 1950, .hsfreqrange = 0x3f, .osc_freq_target = 359 }, > + { .mbps = 2000, .hsfreqrange = 0x0f, .osc_freq_target = 368 }, > + { .mbps = 2050, .hsfreqrange = 0x40, .osc_freq_target = 377 }, > + { .mbps = 2100, .hsfreqrange = 0x41, .osc_freq_target = 387 }, > + { .mbps = 2150, .hsfreqrange = 0x42, .osc_freq_target = 396 }, > + { .mbps = 2200, .hsfreqrange = 0x43, .osc_freq_target = 405 }, > + { .mbps = 2250, .hsfreqrange = 0x44, .osc_freq_target = 414 }, > + { .mbps = 2300, .hsfreqrange = 0x45, .osc_freq_target = 423 }, > + { .mbps = 2350, .hsfreqrange = 0x46, .osc_freq_target = 432 }, > + { .mbps = 2400, .hsfreqrange = 0x47, .osc_freq_target = 442 }, > + { .mbps = 2450, .hsfreqrange = 0x48, .osc_freq_target = 451 }, > + { .mbps = 2500, .hsfreqrange = 0x49, .osc_freq_target = 460 }, > + { /* sentinel */ } > +}; > + > +static const struct v4l2_mbus_framefmt fmt_default = { > + .width = 640, > + .height = 480, > + .code = MEDIA_BUS_FMT_RGB565_1X16, > + .field = V4L2_FIELD_NONE, > + .colorspace = V4L2_COLORSPACE_REC709, > + .ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT, > + .quantization = V4L2_QUANTIZATION_DEFAULT, > + .xfer_func = V4L2_XFER_FUNC_DEFAULT, > +}; > + > +static const struct stm32_csi_fmts *stm32_csi_code_to_fmt(unsigned int code) > +{ > + unsigned int i; > + > + for (i = 0; i < ARRAY_SIZE(stm32_csi_formats); i++) > + if (stm32_csi_formats[i].code == code) > + return &stm32_csi_formats[i]; > + > + return NULL; > +} > + > +static inline struct stm32_csi_dev *to_csidev(struct v4l2_subdev *sd) > +{ > + return container_of(sd, struct stm32_csi_dev, sd); > +} > + > +static int stm32_csi_setup_lane_merger(struct stm32_csi_dev *csidev) > +{ > + u32 lmcfgr = 0; > + int i; unsigned int i? > + > + for (i = 0; i < csidev->num_lanes; i++) { > + if (!csidev->lanes[i] || csidev->lanes[i] > STM32_CSI_LANES_MAX) { > + dev_err(csidev->dev, "Invalid lane id (%d)\n", csidev->lanes[i]); > + return -EINVAL; > + } > + lmcfgr |= (csidev->lanes[i] << ((i * 4) + STM32_CSI_LMCFGR_DLMAP_SHIFT)); > + } > + > + lmcfgr |= (csidev->num_lanes << STM32_CSI_LMCFGR_LANENB_SHIFT); > + > + writel_relaxed(lmcfgr, csidev->base + STM32_CSI_LMCFGR); > + > + return 0; > +} > + > +static void stm32_csi_phy_reg_write(struct stm32_csi_dev *csidev, > + u32 addr, u32 val) > +{ > + /* Based on sequence described at section 5.2.3.2 of DesignWave document */ > + /* For writing the 4-bit testcode MSBs */ > + /* Set testen to high */ > + writel_relaxed(STM32_CSI_PTCR1_TWM, csidev->base + STM32_CSI_PTCR1); > + > + /* Set testclk to high */ > + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); > + > + /* Place 0x00 in testdin */ > + writel_relaxed(STM32_CSI_PTCR1_TWM, csidev->base + STM32_CSI_PTCR1); > + > + /* > + * Set testclk to low (with the falling edge on testclk, the testdin > + * signal content is latched internally) > + */ > + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); > + > + /* Set testen to low */ > + writel_relaxed(0, csidev->base + STM32_CSI_PTCR1); > + > + /* Place the 8-bit word corresponding to the testcode MSBs in testdin */ > + writel_relaxed(((addr >> 8) & STM32_CSI_PTCR1_TDI_MASK) << STM32_CSI_PTCR1_TDI_SHIFT, > + csidev->base + STM32_CSI_PTCR1); > + > + /* Set testclk to high */ > + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); > + > + /* For writing the 8-bit testcode LSBs */ > + /* Set testclk to low */ > + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); > + > + /* Set testen to high */ > + writel_relaxed(STM32_CSI_PTCR1_TWM, csidev->base + STM32_CSI_PTCR1); > + > + /* Set testclk to high */ > + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); > + > + /* Place the 8-bit word test data in testdin */ > + writel_relaxed((addr & STM32_CSI_PTCR1_TDI_MASK) << > + STM32_CSI_PTCR1_TDI_SHIFT | STM32_CSI_PTCR1_TWM, > + csidev->base + STM32_CSI_PTCR1); > + > + /* > + * Set testclk to low (with the falling edge on testclk, the testdin > + * signal content is latched internally) > + */ > + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); > + > + /* Set testen to low */ > + writel_relaxed(0, csidev->base + STM32_CSI_PTCR1); > + > + /* For writing the data */ > + /* Place the 8-bit word corresponding to the page offset in testdin */ > + writel_relaxed((val & STM32_CSI_PTCR1_TDI_MASK) << STM32_CSI_PTCR1_TDI_SHIFT, > + csidev->base + STM32_CSI_PTCR1); > + > + /* Set testclk to high (test data is programmed internally */ > + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); > + > + /* Finish by setting testclk to low */ > + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); > +} > + > +static int stm32_csi_start(struct stm32_csi_dev *csidev, > + struct v4l2_subdev_state *state) > +{ > + const struct stm32_csi_mbps_phy_reg *phy_regs; > + struct v4l2_mbus_framefmt *sink_fmt; > + const struct stm32_csi_fmts *fmt; > + unsigned long phy_clk_frate; > + unsigned int mbps; > + u32 lanes_ie = 0; > + u32 lanes_en = 0; > + s64 link_freq; > + int ret; > + u32 ccfr; > + > + dev_dbg(csidev->dev, "Starting the CSI2\n"); > + > + /* Get the bpp value on pad0 (input of CSI) */ > + sink_fmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SINK); > + fmt = stm32_csi_code_to_fmt(sink_fmt->code); > + > + /* Get the remote sensor link frequency */ > + if (!csidev->s_subdev) > + return -EIO; > + > + link_freq = v4l2_get_link_freq(csidev->s_subdev->ctrl_handler, > + fmt->bpp, 2 * csidev->num_lanes); You'll be able to pass sub-device to the function soon, see e.g. . I intend to send a PR with that early next week. > + if (link_freq < 0) > + return link_freq; > + > + /* MBPS is expressed in Mbps, hence link_freq / 100000 * 2 */ > + mbps = div_s64(link_freq, 500000); > + dev_dbg(csidev->dev, "Computed Mbps: %u\n", mbps); > + > + for (phy_regs = snps_stm32mp25; phy_regs->mbps != 0; phy_regs++) I'd use ARRAY_SIZE() there instead. There's also bsearch. > + if (phy_regs->mbps >= mbps) > + break; > + > + if (!phy_regs->mbps) { > + dev_err(csidev->dev, "Unsupported PHY speed (%u Mbps)", mbps); > + return -ERANGE; > + } > + > + dev_dbg(csidev->dev, "PHY settings: (%u Mbps, %u HS FRange, %u OSC Freq)\n", > + phy_regs->mbps, phy_regs->hsfreqrange, > + phy_regs->osc_freq_target); > + > + /* Prepare lanes related configuration bits */ > + lanes_ie |= STM32_CSI_SR1_DL0_ERRORS; > + lanes_en |= STM32_CSI_PCR_DL0EN; You could initialise these here instead of in variable declaration. > + if (csidev->num_lanes == 2) { > + lanes_ie |= STM32_CSI_SR1_DL1_ERRORS; > + lanes_en |= STM32_CSI_PCR_DL1EN; > + } > + > + ret = pm_runtime_get_sync(csidev->dev); > + if (ret < 0) This requires pm_runtime_put(). Or alternatively, use pm_runtime_resume_and_get(). In the first case I'd add a label for handling this, considering you have already two other cases doign more than returning the error code. > + return ret; > + > + /* Retrieve CSI2PHY clock rate to compute CCFR value */ > + phy_clk_frate = clk_get_rate(csidev->clks[STM32_CSI_CLK_CSI2PHY].clk); > + if (!phy_clk_frate) { > + pm_runtime_put(csidev->dev); > + dev_err(csidev->dev, "CSI2PHY clock rate invalid (0)\n"); > + return ret; > + } > + > + ret = stm32_csi_setup_lane_merger(csidev); > + if (ret) { > + pm_runtime_put(csidev->dev); > + return ret; > + } > + > + /* Enable the CSI */ > + writel_relaxed(STM32_CSI_CR_CSIEN, csidev->base + STM32_CSI_CR); > + > + /* Enable some global CSI related interrupts - bits are same as SR0 */ > + writel_relaxed(STM32_CSI_SR0_ERRORS, csidev->base + STM32_CSI_IER0); > + > + /* Enable lanes related error interrupts */ > + writel_relaxed(lanes_ie, csidev->base + STM32_CSI_IER1); > + > + /* Initialization of the D-PHY */ > + /* Stop the D-PHY */ > + writel_relaxed(0, csidev->base + STM32_CSI_PRCR); > + > + /* Keep the D-PHY in power down state */ > + writel_relaxed(0, csidev->base + STM32_CSI_PCR); > + > + /* Enable testclr clock during 15ns */ > + writel_relaxed(STM32_CSI_PTCR0_TCKEN, csidev->base + STM32_CSI_PTCR0); > + udelay(1); > + writel_relaxed(0, csidev->base + STM32_CSI_PTCR0); > + > + /* Set hsfreqrange */ > + phy_clk_frate /= 1000000; > + ccfr = (phy_clk_frate - 17) * 4; > + writel_relaxed((ccfr << STM32_CSI_PFCR_CCFR_SHIFT) | > + (phy_regs->hsfreqrange << STM32_CSI_PFCR_HSFR_SHIFT), > + csidev->base + STM32_CSI_PFCR); > + > + /* set reg @08 deskew_polarity_rw 1'b1 */ > + stm32_csi_phy_reg_write(csidev, 0x08, 0x38); > + > + /* set reg @0xE4 counter_for_des_en_config_if_rx 0x10 + DLL prog EN */ > + /* This is because 13<= cfgclkfreqrange[5:0]<=38 */ > + stm32_csi_phy_reg_write(csidev, 0xe4, 0x11); > + > + /* set reg @0xe2 & reg @0xe3 value DLL target oscilation freq */ > + /* Based on the table page 77, osc_freq_target */ > + stm32_csi_phy_reg_write(csidev, 0xe2, phy_regs->osc_freq_target & 0xFF); > + stm32_csi_phy_reg_write(csidev, 0xe3, (phy_regs->osc_freq_target >> 8) & 0x0F); > + > + writel_relaxed(STM32_CSI_PFCR_DLD | readl_relaxed(csidev->base + STM32_CSI_PFCR), > + csidev->base + STM32_CSI_PFCR); > + > + /* Enable Lanes */ > + writel_relaxed(lanes_en | STM32_CSI_PCR_CLEN, csidev->base + STM32_CSI_PCR); > + writel_relaxed(lanes_en | STM32_CSI_PCR_CLEN | STM32_CSI_PCR_PWRDOWN, > + csidev->base + STM32_CSI_PCR); > + > + writel_relaxed(STM32_CSI_PRCR_PEN, csidev->base + STM32_CSI_PRCR); > + > + /* Remove the force */ > + writel_relaxed(0, csidev->base + STM32_CSI_PMCR); > + > + return ret; > +} > + > +static void stm32_csi_stop(struct stm32_csi_dev *csidev) > +{ > + dev_dbg(csidev->dev, "Stopping the CSI2\n"); > + > + /* Disable the D-PHY */ > + writel_relaxed(0, csidev->base + STM32_CSI_PCR); > + > + /* Disable ITs */ > + writel_relaxed(0, csidev->base + STM32_CSI_IER0); > + writel_relaxed(0, csidev->base + STM32_CSI_IER1); > + > + /* Disable the CSI */ > + writel_relaxed(0, csidev->base + STM32_CSI_CR); > + > + pm_runtime_put(csidev->dev); > +} > + > +static int stm32_csi_start_vc(struct stm32_csi_dev *csidev, > + struct v4l2_subdev_state *state, u32 vc) > +{ > + struct v4l2_mbus_framefmt *mbus_fmt; > + const struct stm32_csi_fmts *fmt; > + u32 cfgr1 = 0; > + int ret = 0; Redundant initialisation. > + u32 status; > + > + mbus_fmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SOURCE); > + fmt = stm32_csi_code_to_fmt(mbus_fmt->code); > + > + /* If the mbus code is JPEG, don't enable filtering */ > + if (mbus_fmt->code == MEDIA_BUS_FMT_JPEG_1X8) { > + cfgr1 |= STM32_CSI_VCXCFGR1_ALLDT; > + cfgr1 |= fmt->input_fmt << STM32_CSI_VCXCFGR1_CDTFT_SHIFT; > + dev_dbg(csidev->dev, "VC%d: enable AllDT mode\n", vc); > + } else { > + cfgr1 |= fmt->datatype << STM32_CSI_VCXCFGR1_DT0_SHIFT; > + cfgr1 |= fmt->input_fmt << STM32_CSI_VCXCFGR1_DT0FT_SHIFT; > + cfgr1 |= STM32_CSI_VCXCFGR1_DT0EN; > + dev_dbg(csidev->dev, "VC%d: enable DT0(0x%x)/DT0FT(0x%x)\n", > + vc, fmt->datatype, fmt->input_fmt); > + } > + writel_relaxed(cfgr1, csidev->base + STM32_CSI_VCXCFGR1(vc)); > + > + /* Enable processing of the virtual-channel and wait for its status */ > + writel_relaxed(STM32_CSI_CR_VCXSTART(vc) | STM32_CSI_CR_CSIEN, > + csidev->base + STM32_CSI_CR); > + > + ret = readl_relaxed_poll_timeout(csidev->base + STM32_CSI_SR0, > + status, > + status & STM32_CSI_SR0_VCXSTATEF(vc), > + 1000, 1000000); > + if (ret) { > + dev_err(csidev->dev, "failed to start VC(%d)\n", vc); > + return ret; > + } > + > + return 0; > +} > + > +static int stm32_csi_stop_vc(struct stm32_csi_dev *csidev, u32 vc) > +{ > + int ret = 0; Redundant initialisation. > + u32 status; > + > + /* Stop the Virtual Channel */ > + writel_relaxed(STM32_CSI_CR_VCXSTOP(vc) | STM32_CSI_CR_CSIEN, > + csidev->base + STM32_CSI_CR); > + > + ret = readl_relaxed_poll_timeout(csidev->base + STM32_CSI_SR0, > + status, > + !(status & STM32_CSI_SR0_VCXSTATEF(vc)), > + 1000, 1000000); > + if (ret) { > + dev_err(csidev->dev, "failed to stop VC(%d)\n", vc); > + return ret; > + } > + > + /* Disable all DTs */ > + writel_relaxed(0, csidev->base + STM32_CSI_VCXCFGR1(vc)); > + writel_relaxed(0, csidev->base + STM32_CSI_VCXCFGR2(vc)); > + > + return 0; > +} > + > +static int stm32_csi_disable_streams(struct v4l2_subdev *sd, > + struct v4l2_subdev_state *state, u32 pad, > + u64 streams_mask) > +{ > + struct stm32_csi_dev *csidev = to_csidev(sd); > + int ret; > + > + ret = v4l2_subdev_disable_streams(csidev->s_subdev, > + csidev->s_subdev_pad_nb, BIT_ULL(0)); > + if (ret) > + return ret; > + > + /* Stop the VC0 */ > + ret = stm32_csi_stop_vc(csidev, 0); > + if (ret) > + dev_err(csidev->dev, "Failed to stop VC0\n"); > + > + stm32_csi_stop(csidev); > + > + return 0; > +} > + > +static int stm32_csi_enable_streams(struct v4l2_subdev *sd, > + struct v4l2_subdev_state *state, u32 pad, > + u64 streams_mask) > +{ > + struct stm32_csi_dev *csidev = to_csidev(sd); > + int ret; > + > + ret = stm32_csi_start(csidev, state); > + if (ret) > + return ret; > + > + /* Configure & start the VC0 */ > + ret = stm32_csi_start_vc(csidev, state, 0); > + if (ret) { > + dev_err(csidev->dev, "Failed to start VC0\n"); > + stm32_csi_stop(csidev); > + return ret; > + } > + > + ret = v4l2_subdev_enable_streams(csidev->s_subdev, > + csidev->s_subdev_pad_nb, BIT_ULL(0)); > + if (ret) { > + stm32_csi_stop_vc(csidev, 0); > + stm32_csi_stop(csidev); Maybe a label or a few could be useful here? > + return ret; > + } > + > + return 0; > +} > + > +static int stm32_csi_init_state(struct v4l2_subdev *sd, > + struct v4l2_subdev_state *state) > +{ > + int i; unsigned int i > + > + for (i = 0; i < sd->entity.num_pads; i++) > + *v4l2_subdev_state_get_format(state, i) = fmt_default; > + > + return 0; > +} > + > +static int stm32_csi_enum_mbus_code(struct v4l2_subdev *sd, > + struct v4l2_subdev_state *state, > + struct v4l2_subdev_mbus_code_enum *code) > +{ > + if (code->index >= ARRAY_SIZE(stm32_csi_formats)) > + return -EINVAL; > + > + code->code = stm32_csi_formats[code->index].code; > + return 0; > +} > + > +static int stm32_csi_set_pad_format(struct v4l2_subdev *sd, > + struct v4l2_subdev_state *state, > + struct v4l2_subdev_format *format) > +{ > + struct stm32_csi_dev *csidev = to_csidev(sd); > + struct v4l2_mbus_framefmt *framefmt; > + const struct stm32_csi_fmts *fmt; > + > + fmt = stm32_csi_code_to_fmt(format->format.code); > + if (!fmt) { > + dev_dbg(csidev->dev, "Unsupported code %d, use default\n", > + format->format.code); > + format->format.code = fmt_default.code; > + } > + > + framefmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SINK); > + > + if (format->pad == STM32_CSI_PAD_SOURCE) > + format->format = *framefmt; > + else > + *framefmt = format->format; > + > + framefmt = v4l2_subdev_state_get_format(state, STM32_CSI_PAD_SOURCE); > + *framefmt = format->format; > + > + return 0; > +} > + > +static int stm32_csi_log_status(struct v4l2_subdev *sd) > +{ > + struct stm32_csi_dev *csidev = to_csidev(sd); > + unsigned long flags; > + unsigned int i; > + > + spin_lock_irqsave(&csidev->slock, flags); > + > + for (i = 0; i < STM32_CSI_NUM_SR0_EVENTS; i++) { > + if (csidev->sr0_counters[i]) > + dev_info(csidev->dev, "%s events: %d\n", > + stm32_csi_events_sr0[i].name, > + csidev->sr0_counters[i]); > + } > + > + for (i = 0; i < STM32_CSI_NUM_SR1_EVENTS; i++) { > + if (csidev->sr1_counters[i]) > + dev_info(csidev->dev, "%s events: %d\n", > + stm32_csi_events_sr1[i].name, > + csidev->sr1_counters[i]); > + } > + > + spin_unlock_irqrestore(&csidev->slock, flags); > + > + return 0; > +} > + > +static const struct v4l2_subdev_core_ops stm32_csi_core_ops = { > + .log_status = stm32_csi_log_status, > +}; > + > +static const struct v4l2_subdev_video_ops stm32_csi_video_ops = { > + .s_stream = v4l2_subdev_s_stream_helper, > +}; > + > +static const struct v4l2_subdev_pad_ops stm32_csi_pad_ops = { > + .enum_mbus_code = stm32_csi_enum_mbus_code, > + .set_fmt = stm32_csi_set_pad_format, > + .get_fmt = v4l2_subdev_get_fmt, > + .enable_streams = stm32_csi_enable_streams, > + .disable_streams = stm32_csi_disable_streams, > +}; > + > +static const struct v4l2_subdev_ops stm32_csi_subdev_ops = { > + .core = &stm32_csi_core_ops, > + .pad = &stm32_csi_pad_ops, > + .video = &stm32_csi_video_ops, > +}; > + > +static const struct v4l2_subdev_internal_ops stm32_csi_subdev_internal_ops = { > + .init_state = stm32_csi_init_state, > +}; > + > +static int stm32_csi_async_bound(struct v4l2_async_notifier *notifier, > + struct v4l2_subdev *s_subdev, > + struct v4l2_async_connection *asd) > +{ > + struct v4l2_subdev *sd = notifier->sd; > + struct stm32_csi_dev *csidev = to_csidev(sd); > + int remote_pad; > + > + remote_pad = media_entity_get_fwnode_pad(&s_subdev->entity, > + s_subdev->fwnode, > + MEDIA_PAD_FL_SOURCE); > + if (remote_pad < 0) { > + dev_err(csidev->dev, "Couldn't find output pad for subdev %s\n", > + s_subdev->name); > + return remote_pad; > + } > + > + csidev->s_subdev = s_subdev; > + csidev->s_subdev_pad_nb = remote_pad; > + > + return media_create_pad_link(&csidev->s_subdev->entity, > + remote_pad, &csidev->sd.entity, > + STM32_CSI_PAD_SINK, > + MEDIA_LNK_FL_ENABLED | > + MEDIA_LNK_FL_IMMUTABLE); > +} > + > +static const struct v4l2_async_notifier_operations stm32_csi_notifier_ops = { > + .bound = stm32_csi_async_bound, > +}; > + > +static irqreturn_t stm32_csi_irq_thread(int irq, void *arg) > +{ > + struct stm32_csi_dev *csidev = arg; > + unsigned long flags; > + u32 sr0, sr1; > + int i; > + > + sr0 = readl_relaxed(csidev->base + STM32_CSI_SR0); > + sr1 = readl_relaxed(csidev->base + STM32_CSI_SR1); > + > + /* Clear interrupt */ > + writel_relaxed(sr0 & STM32_CSI_SR0_ERRORS, > + csidev->base + STM32_CSI_FCR0); > + writel_relaxed(sr1 & STM32_CSI_SR1_ERRORS, > + csidev->base + STM32_CSI_FCR1); > + > + spin_lock_irqsave(&csidev->slock, flags); > + > + for (i = 0; i < STM32_CSI_NUM_SR0_EVENTS; i++) > + if (sr0 & stm32_csi_events_sr0[i].mask) > + csidev->sr0_counters[i]++; > + > + for (i = 0; i < STM32_CSI_NUM_SR1_EVENTS; i++) > + if (sr1 & stm32_csi_events_sr1[i].mask) > + csidev->sr1_counters[i]++; > + > + spin_unlock_irqrestore(&csidev->slock, flags); > + > + return IRQ_HANDLED; > +} > + > +static int stm32_csi_get_resources(struct stm32_csi_dev *csidev, > + struct platform_device *pdev) > +{ > + int irq, ret, i; unsigned int i ? > + > + csidev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); > + if (IS_ERR(csidev->base)) > + return dev_err_probe(&pdev->dev, PTR_ERR(csidev->base), > + "Failed to ioremap resource\n"); > + > + for (i = 0; i < STM32_CSI_CLK_NB; i++) > + csidev->clks[i].id = stm32_csi_clks_id[i]; > + > + ret = devm_clk_bulk_get(&pdev->dev, STM32_CSI_CLK_NB, > + csidev->clks); Fits on the previous line. > + if (ret < 0) > + return dev_err_probe(&pdev->dev, ret, "Couldn't get clks\n"); > + > + csidev->supplies[0].supply = "vdd"; > + csidev->supplies[1].supply = "vdda18"; > + ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(csidev->supplies), > + csidev->supplies); > + if (ret) > + return dev_err_probe(&pdev->dev, ret, > + "Failed to request regulator vdd\n"); > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) > + return irq; > + > + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, > + stm32_csi_irq_thread, IRQF_ONESHOT, > + dev_name(&pdev->dev), csidev); > + if (ret) > + return dev_err_probe(&pdev->dev, ret, > + "Unable to request irq"); > + > + return 0; > +} > + > +static int stm32_csi_parse_dt(struct stm32_csi_dev *csidev) > +{ > + struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = V4L2_MBUS_CSI2_DPHY }; > + struct v4l2_async_connection *asd; > + struct fwnode_handle *ep; > + int ret; > + > + /* Get bus characteristics from devicetree */ > + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csidev->dev), 0, 0, > + FWNODE_GRAPH_ENDPOINT_NEXT); > + if (!ep) { > + dev_err(csidev->dev, "Could not find the endpoint\n"); > + return -ENODEV; > + } > + > + ret = v4l2_fwnode_endpoint_parse(ep, &v4l2_ep); > + fwnode_handle_put(ep); > + if (ret) { > + dev_err(csidev->dev, "Could not parse v4l2 endpoint\n"); > + return ret; > + } > + > + csidev->num_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes; > + if (csidev->num_lanes > STM32_CSI_LANES_MAX) { > + dev_err(csidev->dev, "Unsupported number of data-lanes: %d\n", > + csidev->num_lanes); > + return -EINVAL; > + } > + > + memcpy(csidev->lanes, v4l2_ep.bus.mipi_csi2.data_lanes, > + sizeof(csidev->lanes)); > + > + ep = fwnode_graph_get_next_endpoint(dev_fwnode(csidev->dev), NULL); How about: ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csidev->dev), 1, 0, FWNODE_GRAPH_ENDPOINT_NEXT); > + if (!ep) { > + dev_err(csidev->dev, "Failed to get next endpoint\n"); > + return -EINVAL; > + } > + > + v4l2_async_subdev_nf_init(&csidev->notifier, &csidev->sd); > + > + asd = v4l2_async_nf_add_fwnode_remote(&csidev->notifier, ep, > + struct v4l2_async_connection); > + > + fwnode_handle_put(ep); > + > + if (IS_ERR(asd)) { > + dev_err(csidev->dev, "Failed to add fwnode remote subdev\n"); > + return PTR_ERR(asd); > + } > + > + csidev->notifier.ops = &stm32_csi_notifier_ops; > + > + ret = v4l2_async_nf_register(&csidev->notifier); > + if (ret) { > + dev_err(csidev->dev, "Failed to register notifier\n"); > + v4l2_async_nf_cleanup(&csidev->notifier); > + return ret; > + } > + > + return ret; > +} > + > +static int stm32_csi_probe(struct platform_device *pdev) > +{ > + struct stm32_csi_dev *csidev; > + struct reset_control *rstc; > + int ret; > + > + csidev = devm_kzalloc(&pdev->dev, sizeof(*csidev), GFP_KERNEL); > + if (!csidev) > + return -ENOMEM; > + > + platform_set_drvdata(pdev, csidev); > + csidev->dev = &pdev->dev; > + > + spin_lock_init(&csidev->slock); > + > + ret = stm32_csi_get_resources(csidev, pdev); > + if (ret) You could just return the error here. The label naming is misleading, too. Same below. > + goto err_free_priv; > + > + ret = stm32_csi_parse_dt(csidev); > + if (ret) > + goto err_free_priv; > + > + csidev->sd.owner = THIS_MODULE; > + csidev->sd.dev = &pdev->dev; > + csidev->sd.internal_ops = &stm32_csi_subdev_internal_ops; > + v4l2_subdev_init(&csidev->sd, &stm32_csi_subdev_ops); > + v4l2_set_subdevdata(&csidev->sd, &pdev->dev); > + snprintf(csidev->sd.name, sizeof(csidev->sd.name), "%s", > + dev_name(&pdev->dev)); > + > + /* Create our media pads */ > + csidev->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; > + csidev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; > + csidev->pads[STM32_CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK; > + csidev->pads[STM32_CSI_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE; > + > + ret = media_entity_pads_init(&csidev->sd.entity, STM32_CSI_PAD_MAX, > + csidev->pads); > + if (ret) > + goto err_cleanup; > + > + ret = v4l2_subdev_init_finalize(&csidev->sd); > + if (ret < 0) > + goto err_cleanup; > + > + ret = v4l2_async_register_subdev(&csidev->sd); > + if (ret < 0) > + goto err_cleanup; You should hold registering the async sub-device until all initialisation has been done. Otherwise, you may get callbacks that end up accessing what has not been set up yet (below). > + > + /* Reset device */ > + rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); > + if (IS_ERR(rstc)) { > + ret = dev_err_probe(&pdev->dev, PTR_ERR(rstc), > + "Couldn't get reset control\n"); > + goto err_cleanup; > + } > + > + ret = reset_control_assert(rstc); > + if (ret) { > + ret = dev_err_probe(&pdev->dev, ret, > + "Failed to assert the reset line\n"); > + goto err_cleanup; > + } > + > + usleep_range(3000, 5000); > + > + ret = reset_control_deassert(rstc); > + if (ret) { > + ret = dev_err_probe(&pdev->dev, ret, > + "Failed to deassert the reset line\n"); > + goto err_cleanup; > + } > + > + pm_runtime_enable(&pdev->dev); > + > + dev_info(&pdev->dev, > + "Probed CSI with %u lanes\n", csidev->num_lanes); > + > + return 0; > + > +err_cleanup: > + v4l2_async_nf_cleanup(&csidev->notifier); > +err_free_priv: > + return ret; > +} > + > +static void stm32_csi_remove(struct platform_device *pdev) > +{ > + struct stm32_csi_dev *csidev = platform_get_drvdata(pdev); > + > + v4l2_async_unregister_subdev(&csidev->sd); > + > + pm_runtime_disable(&pdev->dev); > +} > + > +static int stm32_csi_runtime_suspend(struct device *dev) > +{ > + struct stm32_csi_dev *csidev = dev_get_drvdata(dev); > + int ret; > + > + clk_bulk_disable_unprepare(STM32_CSI_CLK_NB, csidev->clks); > + > + ret = regulator_bulk_disable(ARRAY_SIZE(csidev->supplies), > + csidev->supplies); > + if (ret < 0) > + dev_err(dev, "cannot disable regulators %d\n", ret); > + > + return 0; > +} > + > +static int stm32_csi_runtime_resume(struct device *dev) > +{ > + struct stm32_csi_dev *csidev = dev_get_drvdata(dev); > + int ret; > + > + ret = regulator_bulk_enable(ARRAY_SIZE(csidev->supplies), > + csidev->supplies); > + if (ret) > + goto error_out; > + > + ret = clk_bulk_prepare_enable(STM32_CSI_CLK_NB, csidev->clks); > + if (ret) > + goto error_disable_supplies; > + > + return 0; > + > +error_disable_supplies: > + ret = regulator_bulk_disable(ARRAY_SIZE(csidev->supplies), csidev->supplies); Over 80, please wrap. > + if (ret < 0) > + dev_err(dev, "cannot disable regulators %d\n", ret); > +error_out: > + dev_err(csidev->dev, "Failed to resume: %d\n", ret); > + > + return ret; > +} > + > +static const struct of_device_id stm32_csi_of_table[] = { > + { .compatible = "st,stm32mp25-csi", }, > + { /* end node */ }, > +}; > +MODULE_DEVICE_TABLE(of, stm32_csi_of_table); > + > +static const struct dev_pm_ops stm32_csi_pm_ops = { > + RUNTIME_PM_OPS(stm32_csi_runtime_suspend, > + stm32_csi_runtime_resume, NULL) > +}; > + > +static struct platform_driver stm32_csi_driver = { > + .driver = { > + .name = "stm32-csi", > + .of_match_table = stm32_csi_of_table, > + .pm = pm_ptr(&stm32_csi_pm_ops), > + }, > + .probe = stm32_csi_probe, > + .remove = stm32_csi_remove, > +}; > + > +module_platform_driver(stm32_csi_driver); > + > +MODULE_AUTHOR("Alain Volmat "); > +MODULE_DESCRIPTION("STM32 CSI controller"); > +MODULE_LICENSE("GPL"); > -- Kind regards, Sakari Ailus