From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Sometimes the controller unexpectedly produces a TC (transfer complete)
interrupt before the CC (command complete) interrupt for command 6
(SWITCH). This is a problem because the CC interrupt can get mixed up
with the next request. Add a hack for CMD6.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Acked-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Cc: Ian Molton <ian@xxxxxxxxxxxxxx>
Cc: "Roberto A. Foglietta" <roberto.foglietta@xxxxxxxxx>
Cc: Jarkko Lavinen <jarkko.lavinen@xxxxxxxxx>
Cc: Denis Karpov <ext-denis.2.karpov@xxxxxxxxx>
Cc: Pierre Ossman <pierre@xxxxxxxxx>
Cc: Philip Langdale <philipl@xxxxxxxxx>
Cc: "Madhusudhan" <madhu.cr@xxxxxx>
Cc: <linux-mmc@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/omap_hsmmc.c | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-cater-for-weird-cmd6-behaviour drivers/mmc/host/omap_hsmmc.c
--- a/drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-cater-for-weird-cmd6-behaviour
+++ a/drivers/mmc/host/omap_hsmmc.c
@@ -481,6 +481,13 @@ mmc_omap_xfer_done(struct mmc_omap_host
if (!data) {
struct mmc_request *mrq = host->mrq;
+ /* TC before CC from CMD6 - don't know why, but it happens */
+ if (host->cmd && host->cmd->opcode == 6 &&
+ host->response_busy) {
+ host->response_busy = 0;
+ return;
+ }
+
host->mrq = NULL;
mmc_request_done(host->mmc, mrq);
return;
_
--
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