[PATCH] mmc: rpmb: do not force a retune before RPMB switch

Jorge Ramirez-Ortiz
2023-12-11T16:55:10Z

Requesting a retune before switching to the RPMB partition has been
observed to cause CRC errors on the RPMB reads (-EILSEQ).

Since RPMB reads can not be retried, the clients would be directly
affected by the errors.

This commit disables the retune request prior to switching to the RPMB
partition: mmc_retune_pause() no longer triggers a retune before the
pause period begins.

This was verified with the sdhci-of-arasan driver (ZynqMP) configured
for HS200 using two separate eMMC cards (DG4064 and 064GB2). In both
cases, the error was easy to reproduce triggering every few tenths of
reads.

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Acked-by: Avri Altman <avri.altman@wdc.com>
---
v2:
mmc_retune_pause() no longer can trigger a retune.
Keeping Avri Altman Acked-by since they are functionally equivalent.
v1:
modify mmc_retune_pause to optionally trigger a retune.

drivers/mmc/core/host.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 096093f7be00..ed44920e92df 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -119,13 +119,12 @@ void mmc_retune_enable(struct mmc_host *host)

/*
* Pause re-tuning for a small set of operations. The pause begins after the
- * next command and after first doing re-tuning.
+ * next command.
*/
void mmc_retune_pause(struct mmc_host *host)
{
if (!host->retune_paused) {
host->retune_paused = 1;
- mmc_retune_needed(host);
mmc_retune_hold(host);
}
}
--
2.34.1