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

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: 7ff0b53c4051145d ("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>

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 8171eed..c75641b 100644 (file)
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -564,14 +564,16 @@ 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;