From: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
To: "Mark Brown" <broonie@kernel.org>,
"Michal Simek" <michal.simek@xilinx.com>,
"Sören Brinkmann" <soren.brinkmann@xilinx.com>,
linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Subject: [PATCH v2 02/15] spi/xilinx: Leave the IRQ always enabled.
Date: Wed, 28 Jan 2015 13:23:41 +0100 [thread overview]
Message-ID: <1422447834-23116-3-git-send-email-ricardo.ribalda@gmail.com> (raw)
In-Reply-To: <1422447834-23116-1-git-send-email-ricardo.ribalda@gmail.com>
Instead of enabling the IRQ and disabling it for every transaction.
Specially the small transactions (1,2 words) benefit from removing 3 bus
accesses.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---
drivers/spi/spi-xilinx.c | 19 +++++--------------
1 file changed, 5 insertions(+), 14 deletions(-)
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 1890af8..d933207 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -167,8 +167,11 @@ static void xspi_init_hw(struct xilinx_spi *xspi)
/* Reset the SPI device */
xspi->write_fn(XIPIF_V123B_RESET_MASK,
regs_base + XIPIF_V123B_RESETR_OFFSET);
- /* Disable all the interrupts just in case */
- xspi->write_fn(0, regs_base + XIPIF_V123B_IIER_OFFSET);
+ /* Enable the transmit empty interrupt, which we use to determine
+ * progress on the transmission.
+ */
+ xspi->write_fn(XSPI_INTR_TX_EMPTY,
+ regs_base + XIPIF_V123B_IIER_OFFSET);
/* Enable the global IPIF interrupt */
xspi->write_fn(XIPIF_V123B_GINTR_ENABLE,
regs_base + XIPIF_V123B_DGIER_OFFSET);
@@ -237,7 +240,6 @@ static void xilinx_spi_fill_tx_fifo(struct xilinx_spi *xspi, int n_words)
static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
{
struct xilinx_spi *xspi = spi_master_get_devdata(spi->master);
- u32 ipif_ier;
/* We get here with transmitter inhibited */
@@ -246,14 +248,6 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
xspi->remaining_bytes = t->len;
reinit_completion(&xspi->done);
-
- /* Enable the transmit empty interrupt, which we use to determine
- * progress on the transmission.
- */
- ipif_ier = xspi->read_fn(xspi->regs + XIPIF_V123B_IIER_OFFSET);
- xspi->write_fn(ipif_ier | XSPI_INTR_TX_EMPTY,
- xspi->regs + XIPIF_V123B_IIER_OFFSET);
-
for (;;) {
u16 cr;
int n_words;
@@ -290,9 +284,6 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
break;
}
- /* Disable the transmit empty interrupt */
- xspi->write_fn(ipif_ier, xspi->regs + XIPIF_V123B_IIER_OFFSET);
-
return t->len - xspi->remaining_bytes;
}
--
2.1.4
next prev parent reply other threads:[~2015-01-29 1:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-28 12:23 [PATCH v2 00/15] spi/xilinx: Speed-up Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 01/15] spi/xilinx: Simplify spi_fill_tx_fifo Ricardo Ribalda Delgado
2015-01-28 12:23 ` Ricardo Ribalda Delgado [this message]
2015-01-28 19:38 ` [PATCH v2 02/15] spi/xilinx: Leave the IRQ always enabled Mark Brown
2015-01-28 12:23 ` [PATCH v2 03/15] spi/xilinx: Code cleanup Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 04/15] spi/xilinx: Use cached value of register Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 05/15] spi/xilinx: Support cores with no interrupt Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 06/15] spi/xilinx: Do not inhibit transmission in polling mode Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 07/15] spi/xilinx: Support for spi mode CS_HIGH Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 08/15] spi/xilinx: Remove rx_fn and tx_fn pointer Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 09/15] spi/xilinx: Make spi_tx and spi_rx simmetric Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 10/15] spi/xilinx: Convert remainding_bytes in remaining words Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 11/15] spi/xilinx: Convert bits_per_word in bytes_per_word Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 12/15] spi/xilinx: Remove iowrite/ioread wrappers Ricardo Ribalda Delgado
2015-01-30 6:13 ` Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 13/15] spi/xilinx: Remove remaining_words driver data variable Ricardo Ribalda Delgado
2015-01-28 12:23 ` [PATCH v2 14/15] spi/xilinx: Check number of slaves range Ricardo Ribalda Delgado
2015-01-28 19:40 ` Mark Brown
2015-01-28 12:23 ` [PATCH v2 15/15] spi/xilinx: Use polling mode on small transfers Ricardo Ribalda Delgado
2015-01-28 19:43 ` [PATCH v2 00/15] spi/xilinx: Speed-up Mark Brown
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