linux-kernel - [PATCH v2 2/2] mmc: mtk-sd: Add support for ignoring cmd response CRC

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Message-ID: <20241126125041.16071-3-andy-ld.lu@mediatek.com>
Date: Tue, 26 Nov 2024 20:48:23 +0800
From: Andy-ld Lu <andy-ld.lu@...iatek.com>
To: <ulf.hansson@...aro.org>, <angelogioacchino.delregno@...labora.com>,
	<matthias.bgg@...il.com>, <avri.altman@....com>, <adrian.hunter@...el.com>,
	<wenbin.mei@...iatek.com>
CC: <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>,
	Andy-ld Lu <andy-ld.lu@...iatek.com>
Subject: [PATCH v2 2/2] mmc: mtk-sd: Add support for ignoring cmd response CRC

The current process flow does not handle MMC requests that are indicated
to ignore the command response CRC. For instance, cmd12 and cmd48 from
mmc_cqe_recovery() are marked to ignore CRC, but they are not matched to
the appropriate response type in msdc_cmd_find_resp(). As a result, they
are defaulted to 'MMC_RSP_NONE', which means no response is expected.

This commit applies the flag 'MMC_RSP_R1B_NO_CRC' to fix the response type
setting in msdc_cmd_find_resp() and adds the logic to ignore CRC in
msdc_cmd_done().

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Signed-off-by: Andy-ld Lu <andy-ld.lu@...iatek.com>
---
 drivers/mmc/host/mtk-sd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index efb0d2d5716b..e2c385853eef 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1097,11 +1097,12 @@ static inline u32 msdc_cmd_find_resp(struct msdc_host *host,
 	u32 resp;
 
 	switch (mmc_resp_type(cmd)) {
-		/* Actually, R1, R5, R6, R7 are the same */
+	/* Actually, R1, R5, R6, R7 are the same */
 	case MMC_RSP_R1:
 		resp = 0x1;
 		break;
 	case MMC_RSP_R1B:
+	case MMC_RSP_R1B_NO_CRC:
 		resp = 0x7;
 		break;
 	case MMC_RSP_R2:
@@ -1351,7 +1352,8 @@ static bool msdc_cmd_done(struct msdc_host *host, int events,
 			 * CRC error.
 			 */
 			msdc_reset_hw(host);
-		if (events & MSDC_INT_RSPCRCERR) {
+		if (events & MSDC_INT_RSPCRCERR &&
+		    mmc_resp_type(cmd) != MMC_RSP_R1B_NO_CRC) {
 			cmd->error = -EILSEQ;
 			host->error |= REQ_CMD_EIO;
 		} else if (events & MSDC_INT_CMDTMO) {
-- 
2.46.0