2008-06-30 21:45:29

by Ben Dooks

[permalink] [raw]
Subject: [patch v5 02/16] MMC: S3C24XX MMC/SD driver write fixes

From: Harald Welte <[email protected]>

This patch is a workaround of some S3C2410 MMC chip bug

Signed-off-by: Ben Dooks <[email protected]>

Index: linux-2.6.26-rc8-next20080627/drivers/mmc/host/s3cmci.c
===================================================================
--- linux-2.6.26-rc8-next20080627.orig/drivers/mmc/host/s3cmci.c 2008-06-30 12:18:49.000000000 +0100
+++ linux-2.6.26-rc8-next20080627/drivers/mmc/host/s3cmci.c 2008-06-30 12:19:04.000000000 +0100
@@ -461,9 +461,19 @@ static irqreturn_t s3cmci_irq(int irq, v

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;

--
Ben ([email protected], http://www.fluff.org/)

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