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[v6,1/9] mmc: mmci: Clear busy_status when starting command

Message ID 20230405-pl180-busydetect-fix-v6-1-b850ec8019f3@linaro.org
State New
Headers show
Series Fix busydetect on Ux500 PL180/MMCI | expand

Commit Message

Linus Walleij June 16, 2023, 8:30 a.m. UTC 
If we are starting a command which can generate a busy
response, then clear the variable host->busy_status
if the variant is using a ->busy_complete callback.

We are lucky that the member is zero by default and
hopefully always gets cleared in the ->busy_complete
callback even on errors, but it's just fragile so
make sure it is always initialized to zero.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v4->v6:
- No changes.
ChangeLog v3->v4:
- Fix the oneline stray change to semantic order of busy
  flag so the patch is the oneliner it's supposed to be.
ChangeLog v2->v3:
- Clear host->busy_status no matter if the MMC_RSP_BUSY flag
  is set or not.
- Now we have an if inside an if left, so combine these into
  one singel conditional.
- Resulting re-flow the if-clause.
ChangeLog v1->v2:
- Unconditionally clear host->busy_status if we get a
  busy response.
---
 drivers/mmc/host/mmci.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 97a77eefb11a..0a4b6b6e0f03 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1238,6 +1238,7 @@  mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
 			c |= host->variant->cmdreg_srsp;
 	}
 
+	host->busy_status = 0;
 	if (host->variant->busy_timeout && cmd->flags & MMC_RSP_BUSY) {
 		if (!cmd->busy_timeout)
 			cmd->busy_timeout = 10 * MSEC_PER_SEC;