linux-kernel - [PATCH 2/3] mmc: block: ioctl: do write error check for spi

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Date:   Wed, 5 Apr 2023 11:57:29 +0000
From:   Christian Löhle <CLoehle@...erstone.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Avri Altman <avri.altman@....com>
Subject: [PATCH 2/3] mmc: block: ioctl: do write error check for spi

SPI doesn't have the usual PROG path we can check for error bits
after moving back to TRAN. Instead it holds the line LOW until
completion. We can then check if the card shows any errors or
is in IDLE state, indicating the line is no longer LOW because
the card was reset.

Signed-off-by: Christian Loehle <cloehle@...erstone.com>
---
 drivers/mmc/core/block.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 16e262ddc954..35ff7101cbb1 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -182,6 +182,7 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
 			       int recovery_mode,
 			       struct mmc_queue *mq);
 static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
+static int mmc_spi_err_check(struct mmc_card *card);
 
 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 {
@@ -553,7 +554,7 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 	/* If it's an R1B response we need some more preparations. */
 	busy_timeout_ms = idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS;
 	r1b_resp = (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B;
-	if (r1b_resp)
+	if (r1b_resp && !mmc_host_is_spi(card->host))
 		use_r1b_resp = mmc_prepare_busy_cmd(card->host, &cmd,
 						    busy_timeout_ms);
 
@@ -612,8 +613,12 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 	if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
 		return 0;
 
+	if (mmc_host_is_spi(card->host)) {
+		if (idata->ic.write_flag)
+			err = mmc_spi_err_check(card);
+	}
 	/* Ensure RPMB/R1B command has completed by polling with CMD13. */
-	if (idata->rpmb || r1b_resp)
+	else if (idata->rpmb || r1b_resp)
 		err = mmc_poll_for_busy(card, busy_timeout_ms, false,
 					MMC_BUSY_IO);
 
-- 
2.37.3


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