linux-kernel - [PATCH] mmc: block: workaround long ioctl busy timeout

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Date:   Mon, 16 Jan 2023 14:38:53 +0000
From:   Christian Löhle <CLoehle@...erstone.com>
To:     "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        Avri Altman <Avri.Altman@....com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>
Subject: [PATCH] mmc: block: workaround long ioctl busy timeout

The ioctl interface allowed to set cmd_timeout_ms when polling for
busy on R1B commands. This was often limited by the max hw timeout
so work around it like for the sanitize command.

Signed-off-by: Christian Loehle <cloehle@...erstone.com>
---
 drivers/mmc/core/block.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 20da7ed43e6d..ba3bc9014179 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -472,6 +472,8 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 	struct scatterlist sg;
 	int err;
 	unsigned int target_part;
+	unsigned int busy_timeout = MMC_BLK_TIMEOUT_MS;
+	int poll_prog = false;
 
 	if (!card || !md || !idata)
 		return -EINVAL;
@@ -493,6 +495,12 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 	cmd.opcode = idata->ic.opcode;
 	cmd.arg = idata->ic.arg;
 	cmd.flags = idata->ic.flags;
+	/* R1B flag might be removed here to work around hw, so save it */
+	poll_prog = (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B);
+	busy_timeout = idata->ic.cmd_timeout_ms ? :
+		MMC_BLK_TIMEOUT_MS;
+	if (poll_prog)
+		mmc_prepare_busy_cmd(card->host, &cmd, busy_timeout);
 
 	if (idata->buf_bytes) {
 		data.sg = &sg;
@@ -596,7 +604,7 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 	if (idata->ic.postsleep_min_us)
 		usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 
-	if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
+	if (poll_prog) {
 		/*
 		 * Ensure RPMB/R1B command has completed by polling CMD13 "Send Status". Here we
 		 * allow to override the default timeout value if a custom timeout is specified.
-- 
2.37.3


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