linux-kernel - [PATCH V2 1/1] mmc:sdhci:Fix the SD tuning issue that the SDHCI_TRANSFER

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Message-Id: <20221104064221.812-1-charl.liu@bayhubtech.com>
Date:   Thu,  3 Nov 2022 23:42:21 -0700
From:   Charl Liu <charl.liu@...hubtech.com>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shaper.liu@...hubtech.com, chevron.li@...hubtech.com,
        thomas.hu@...hubtech.com, xiaoguang.yu@...hubtech.com,
        shirley.her@...hubtech.com
Subject: [PATCH V2 1/1] mmc:sdhci:Fix the SD tuning issue that the SDHCI_TRANSFER_MODE is cleared incorrectly

When cmd->opcode == MMC_SEND_TUNING_BLOCK, the SDHCI_TRANSFER_MODE
should also be kept

Signed-off-by: Charl Liu <charl.liu@...hubtech.com>
---
change in V1:
Keeping the SDHCI_TRANSFER_MODE when cmd->opcode == MMC_END_TUNING_BLOCK

change in V2:
add the mmc_op_tuning interface to judge if the opcode is tuning CMD
---
 drivers/mmc/host/sdhci.c | 2 +-
 include/linux/mmc/mmc.h  | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 22152029e14c..9388628215ca 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1430,7 +1430,7 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
 		if (host->quirks2 &
 			SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
 			/* must not clear SDHCI_TRANSFER_MODE when tuning */
-			if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+			if (!mmc_op_tuning(cmd->opcode))
 				sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
 		} else {
 		/* clear Auto CMD settings for no data CMDs */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index d9a65c6a8816..d809bdfcc59b 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -99,6 +99,12 @@ static inline bool mmc_op_multi(u32 opcode)
 	       opcode == MMC_READ_MULTIPLE_BLOCK;
 }
 
+static inline bool mmc_op_tuning(u32 opcode)
+{
+	return opcode == MMC_SEND_TUNING_BLOCK ||
+	       opcode == MMC_SEND_TUNING_BLOCK_HS200;
+}
+
 /*
  * MMC_SWITCH argument format:
  *
-- 
2.32.0