From: Harald Welte <laforge@openmoko.org>
Date: Mon, 30 Jun 2008 21:40:25 +0000 (+0100)
Subject: MMC: S3C24XX MMC/SD driver write fixes
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=679f0f8abd7187baaff40a47fe4733ae4c24cc9a;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

MMC: S3C24XX MMC/SD driver write fixes

This patch is a workaround of some S3C2410 MMC chip bug

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
---

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index c6a4d3cadf2b..4db5bd7c0494 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -461,9 +461,19 @@ static irqreturn_t s3cmci_irq(int irq, void *dev_id)
 
 	if (mci_csta & S3C2410_SDICMDSTAT_CRCFAIL) {
 		if (cmd->flags & MMC_RSP_CRC) {
-			cmd->error = -EILSEQ;
-			host->status = "error: bad command crc";
-			goto fail_transfer;
+			if (host->mrq->cmd->flags & MMC_RSP_136) {
+				dbg(host, dbg_irq,
+				    "fixup: ignore CRC fail with long rsp\n");
+			} else {
+				/* note, we used to fail the transfer
+				 * here, but it seems that this is just
+				 * the hardware getting it wrong.
+				 *
+				 * cmd->error = -EILSEQ;
+				 * host->status = "error: bad command crc";
+				 * goto fail_transfer;
+				*/
+			}
 		}
 
 		mci_cclear |= S3C2410_SDICMDSTAT_CRCFAIL;