[PATCH 4.19 314/338] mmc: renesas_sdhi: dont overwrite TAP settings when HS400 tuning is complete

[Greg Kroah-Hartman]

From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>

commit 03e59b1e2f56245163b14c69e0a830c24b1a3a47 upstream.

When HS400 tuning is complete and HS400 is going to be activated, we
have to keep the current number of TAPs and should not overwrite them
with a hardcoded value. This was probably a copy&paste mistake when
upporting HS400 support from the BSP.

Fixes: 26eb2607fa28 ("mmc: renesas_sdhi: add eMMC HS400 mode support")
Reported-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20220404114902.12175-1-wsa+renesas@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/mmc/host/renesas_sdhi_core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/mmc/host/renesas_sdhi_core.c
+++ b/drivers/mmc/host/renesas_sdhi_core.c
@@ -302,10 +302,10 @@ static void renesas_sdhi_hs400_complete(
 			SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) |
 			sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
 
-	/* Set the sampling clock selection range of HS400 mode */
 	sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
 		       SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
-		       0x4 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
+		       sd_scc_read32(host, priv,
+				     SH_MOBILE_SDHI_SCC_DTCNTL));
 
 
 	if (host->pdata->flags & TMIO_MMC_HAVE_4TAP_HS400)