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[25/32] omap_hsmmc: cater for weird CMD6 behaviour

Message ID 20090710124302.1262.37406.sendpatchset@ahunter-tower (mailing list archive)
State Awaiting Upstream, archived
Headers show

Commit Message

Adrian Hunter July 10, 2009, 12:43 p.m. UTC 
From 4ad1f699fad1f7132e5a6a7ad1a2a433accb88d4 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(-)
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Patch

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 315d1df..28563d6 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;