iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

spi: sh-msiof: Fix setting SIRMDR1.SYNCAC to match SITMDR1.SYNCAC

Browse Source 
[ Upstream commit 0921e11e1e ]

According to section 59.2.4 MSIOF Receive Mode Register 1 (SIRMDR1) in
the R-Car Gen3 datasheet Rev.1.00, the value of the SIRMDR1.SYNCAC bit
must match the value of the SITMDR1.SYNCAC bit.  However,
sh_msiof_spi_setup() changes only the latter.

Fix this by updating the SIRMDR1 register like the SITMDR1 register,
taking into account register bits that exist in SITMDR1 only.

Reported-by: Renesas BSP team via Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Fixes: 7ff0b53c40 ("spi: sh-msiof: Avoid writing to registers from spi_master.setup()")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven
2018-05-23 11:02:04 +02:00
committed by Greg Kroah-Hartman
parent 7eda318729
commit 56a58a5395
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/spi/spi-sh-msiof.c
View File

@ -555,14 +555,16 @@ static int sh_msiof_spi_setup(struct spi_device *spi)
/* Configure native chip select mode/polarity early */
clr = MDR1_SYNCMD_MASK;
set = MDR1_TRMD | TMDR1_PCON | MDR1_SYNCMD_SPI;
set = MDR1_SYNCMD_SPI;
if (spi->mode & SPI_CS_HIGH)
clr |= BIT(MDR1_SYNCAC_SHIFT);
else
set |= BIT(MDR1_SYNCAC_SHIFT);
pm_runtime_get_sync(&p->pdev->dev);
tmp = sh_msiof_read(p, TMDR1) & ~clr;
sh_msiof_write(p, TMDR1, tmp | set);
sh_msiof_write(p, TMDR1, tmp | set | MDR1_TRMD | TMDR1_PCON);
tmp = sh_msiof_read(p, RMDR1) & ~clr;
sh_msiof_write(p, RMDR1, tmp | set);
pm_runtime_put(&p->pdev->dev);
p->native_cs_high = spi->mode & SPI_CS_HIGH;
p->native_cs_inited = true;