Re: [PATCH v13 6/6] soc: mediatek: mutex: add functions that operate registers by CMDQ

[CK Hu <ck.hu@mediatek.com>]

Hi, Moudy:

On Tue, 2022-03-15 at 14:10 +0800, Moudy Ho wrote:
> Due to hardware limitations, MDP3 is necessary to enable MUTEX in
> each frame for SOF triggering and cooperate with CMDQ control to
> reduce the amount of interrupts generated(also, reduce frame
> latency).
> 
> In response to the above situation, a new interface
> "mtk_mutex_enable_by_cmdq" has been added to achieve the purpose.
> 
> Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
> ---
>  drivers/soc/mediatek/mtk-mutex.c       | 42
> +++++++++++++++++++++++++-
>  include/linux/soc/mediatek/mtk-mutex.h |  2 ++
>  2 files changed, 43 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-mutex.c
> b/drivers/soc/mediatek/mtk-mutex.c
> index 88fb4fc8f216..0d85111cfbe2 100644
> --- a/drivers/soc/mediatek/mtk-mutex.c
> +++ b/drivers/soc/mediatek/mtk-mutex.c
> @@ -7,10 +7,16 @@
>  #include <linux/iopoll.h>
>  #include <linux/module.h>
>  #include <linux/of_device.h>
> +#include <linux/of_address.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  #include <linux/soc/mediatek/mtk-mmsys.h>
>  #include <linux/soc/mediatek/mtk-mutex.h>
> +#include <linux/soc/mediatek/mtk-cmdq.h>
> +
> +#define MTK_MUTEX_ENABLE			BIT(0)

This is not related to cmdq. Separate this to another patch and apply
to mtk_mutex_enable() also.

> +#define MTK_MUTEX_MOD_MASK			0x07FFFFFF

Useless, remove.

> +#define MTK_MUTEX_SOF_MASK			0x00000007

Ditto.

>  
>  #define MT2701_MUTEX0_MOD0			0x2c
>  #define MT2701_MUTEX0_SOF0			0x30
> @@ -167,6 +173,7 @@ struct mtk_mutex_data {
>  	const unsigned int mutex_sof_reg;
>  	const unsigned long long *mutex_table_mod;
>  	const bool no_clk;
> +	const bool has_gce_client_reg;
>  };
>  
>  struct mtk_mutex_ctx {
> @@ -175,6 +182,8 @@ struct mtk_mutex_ctx {
>  	void __iomem			*regs;
>  	struct mtk_mutex		mutex[10];
>  	const struct mtk_mutex_data	*data;
> +	phys_addr_t			addr;
> +	struct cmdq_client_reg		cmdq_reg;
>  };
>  
>  static const unsigned int mt2701_mutex_mod[DDP_COMPONENT_ID_MAX] = {
> @@ -357,6 +366,7 @@ static const struct mtk_mutex_data
> mt8183_mutex_driver_data = {
>  	.mutex_sof_reg = MT8183_MUTEX0_SOF0,
>  	.mutex_table_mod = mt8183_mutex_table_mod,
>  	.no_clk = true,
> +	.has_gce_client_reg = true,
>  };
>  
>  static const struct mtk_mutex_data mt8186_mutex_driver_data = {
> @@ -639,6 +649,22 @@ void mtk_mutex_enable(struct mtk_mutex *mutex)
>  }
>  EXPORT_SYMBOL_GPL(mtk_mutex_enable);
>  
> +void mtk_mutex_enable_by_cmdq(struct mtk_mutex *mutex,
> +			      struct cmdq_pkt *pkt)
> +{
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +	struct mtk_mutex_ctx *mtx = container_of(mutex, struct
> mtk_mutex_ctx,
> +						 mutex[mutex->id]);
> +
> +	WARN_ON(&mtx->mutex[mutex->id] != mutex);
> +
> +	cmdq_pkt_write_mask(pkt, mtx->cmdq_reg.subsys,
> +			    mtx->aaddr + DISP_REG_MUTEX_EN(mutex->id),
> +			    MTK_MUTEX_ENABLE, MTK_MUTEX_ENABLE);

#else
/* show some error message here */


> +#endif
> +}
> +EXPORT_SYMBOL_GPL(mtk_mutex_enable_by_cmdq);
> +
>  void mtk_mutex_disable(struct mtk_mutex *mutex)
>  {
>  	struct mtk_mutex_ctx *mtx = container_of(mutex, struct
> mtk_mutex_ctx,
> @@ -677,7 +703,7 @@ static int mtk_mutex_probe(struct platform_device
> *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct mtk_mutex_ctx *mtx;
> -	struct resource *regs;
> +	struct resource *regs, addr;
>  	int i;
>  
>  	mtx = devm_kzalloc(dev, sizeof(*mtx), GFP_KERNEL);
> @@ -698,6 +724,20 @@ static int mtk_mutex_probe(struct
> platform_device *pdev)
>  		}
>  	}
>  
> +	if (of_address_to_resource(dev->of_node, 0, &addr) < 0)
> +		mtx->addr = 0L;
> +	else
> +		mtx->addr = addr.start;
> +
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +	if (mtx->data->has_gce_client_reg) {

In current upstreamed mt8183.dtsi [1], mutex device node has no
mediatek,gce-client-reg property and display maybe work (?). So I think
this should be backward-compatible.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/mediatek/mt8183.dtsi?h=v5.17-rc8#n1510

Regards,
CK

> +		if (cmdq_dev_get_client_reg(dev, &mtx->cmdq_reg, 0)) {
> +			dev_err(dev, "No mediatek,gce-client-reg!\n");
> +			return ret;
> +		}
> +	}
> +#endif
> +
>  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	mtx->regs = devm_ioremap_resource(dev, regs);
>  	if (IS_ERR(mtx->regs)) {
> diff --git a/include/linux/soc/mediatek/mtk-mutex.h
> b/include/linux/soc/mediatek/mtk-mutex.h
> index c8355bb0e6d6..18a4b1dc3773 100644
> --- a/include/linux/soc/mediatek/mtk-mutex.h
> +++ b/include/linux/soc/mediatek/mtk-mutex.h
> @@ -45,6 +45,8 @@ void mtk_mutex_set_mod(struct mtk_mutex *mutex,
>  void mtk_mutex_set_sof(struct mtk_mutex *mutex,
>  		       enum mtk_mutex_table_index idx);
>  void mtk_mutex_enable(struct mtk_mutex *mutex);
> +void mtk_mutex_enable_by_cmdq(struct mtk_mutex *mutex,
> +			      struct cmdq_pkt *pkt);
>  void mtk_mutex_disable(struct mtk_mutex *mutex);
>  void mtk_mutex_remove_comp(struct mtk_mutex *mutex,
>  			   enum mtk_ddp_comp_id id);