This is a note to let you know that I've just added the patch titled
spi: s3c64xx: Extract FIFO depth calculation to a dedicated macro
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-s3c64xx-extract-fifo-depth-calculation-to-a-dedi.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c2036fcfa9ba4f364f6c477640b25ed1cf00c9bc
Author: Sam Protsenko <semen.protsenko@xxxxxxxxxx>
Date: Sat Jan 20 11:00:01 2024 -0600
spi: s3c64xx: Extract FIFO depth calculation to a dedicated macro
[ Upstream commit 460efee706c2b6a4daba62ec143fea29c2e7b358 ]
Simplify the code by extracting all cases of FIFO depth calculation into
a dedicated macro. No functional change.
Signed-off-by: Sam Protsenko <semen.protsenko@xxxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Link: https://msgid.link/r/20240120170001.3356-1-semen.protsenko@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Stable-dep-of: a3d3eab627bb ("spi: s3c64xx: Use DMA mode from fifo size")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 0e48ffd499b9f..432ec60d35684 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -109,6 +109,7 @@
#define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i))
#define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \
FIFO_LVL_MASK(i))
+#define FIFO_DEPTH(i) ((FIFO_LVL_MASK(i) >> 1) + 1)
#define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
#define S3C64XX_SPI_TRAILCNT_OFF 19
@@ -406,7 +407,7 @@ static bool s3c64xx_spi_can_dma(struct spi_controller *host,
struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
if (sdd->rx_dma.ch && sdd->tx_dma.ch) {
- return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
+ return xfer->len > FIFO_DEPTH(sdd);
} else {
return false;
}
@@ -495,9 +496,7 @@ static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
void __iomem *regs = sdd->regs;
unsigned long val = 1;
u32 status;
-
- /* max fifo depth available */
- u32 max_fifo = (FIFO_LVL_MASK(sdd) >> 1) + 1;
+ u32 max_fifo = FIFO_DEPTH(sdd);
if (timeout_ms)
val = msecs_to_loops(timeout_ms);
@@ -604,7 +603,7 @@ static int s3c64xx_wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
* For any size less than the fifo size the below code is
* executed atleast once.
*/
- loops = xfer->len / ((FIFO_LVL_MASK(sdd) >> 1) + 1);
+ loops = xfer->len / FIFO_DEPTH(sdd);
buf = xfer->rx_buf;
do {
/* wait for data to be received in the fifo */
@@ -741,7 +740,7 @@ static int s3c64xx_spi_transfer_one(struct spi_controller *host,
struct spi_transfer *xfer)
{
struct s3c64xx_spi_driver_data *sdd = spi_controller_get_devdata(host);
- const unsigned int fifo_len = (FIFO_LVL_MASK(sdd) >> 1) + 1;
+ const unsigned int fifo_len = FIFO_DEPTH(sdd);
const void *tx_buf = NULL;
void *rx_buf = NULL;
int target_len = 0, origin_len = 0;
@@ -1280,7 +1279,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Targets attached\n",
sdd->port_id, host->num_chipselect);
dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\n",
- mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1);
+ mem_res, FIFO_DEPTH(sdd));
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
