[U-Boot] [PATCH] mmc: tmio: Clamp SD_SECCNT to 16bit values on 16bit IP

[Marek Vasut]

On 16bit variants of the TMIO SD IP, the SECCNT register can only be
programmed to 16bit values, while on the 32bit and 64bit variants it
can be programmed to 32bit values. The SECCNT register indicates the
maximum number of blocks in a continuous transfer. Hence, limit the
maximum continuous transfer block count to 65535 blocks on 16bit
variants of the TMIO IP and to BIT(32)-1 blocks on 32bit and 64bit
variants.

Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
---
 drivers/mmc/tmio-common.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c
index 01d8c2b925..812205a21f 100644
--- a/drivers/mmc/tmio-common.c
+++ b/drivers/mmc/tmio-common.c
@@ -783,7 +783,10 @@ int tmio_sd_probe(struct udevice *dev, u32 quirks)
 	plat->cfg.f_min = mclk /
 			(priv->caps & TMIO_SD_CAP_DIV1024 ? 1024 : 512);
 	plat->cfg.f_max = mclk;
-	plat->cfg.b_max = U32_MAX; /* max value of TMIO_SD_SECCNT */
+	if (quirks & TMIO_SD_CAP_16BIT)
+		plat->cfg.b_max = U16_MAX; /* max value of TMIO_SD_SECCNT */
+	else
+		plat->cfg.b_max = U32_MAX; /* max value of TMIO_SD_SECCNT */
 
 	upriv->mmc = &plat->mmc;
 
-- 
2.20.1