[PATCH V3 24/30] omap_hsmmc: cater for weird CMD6 behaviour

Adrian Hunter
2009-09-09T11:59:54Z

>From 60731c064681d57c84ce563274f3f5869c598cce Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@nokia.com>
Date: Sat, 16 May 2009 10:05:40 +0300
Subject: [PATCH] omap_hsmmc: cater for weird CMD6 behaviour

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@nokia.com>
---
drivers/mmc/host/omap_hsmmc.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 42f3aad..205cc3a 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -474,6 +474,13 @@ mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
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;
--
1.5.6.3