sdhci: add auto CMD12 support for eSDHC driver

Add auto CMD12 command support for eSDHC driver. This is needed by P4080 and P1022 for block read/write. Manual asynchronous CMD12 abort operation causes protocol violations on these silicons. Signed-off-by: Jerry Huang <[email protected]> Signed-off-by: Roy Zang <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Kumar Gala <[email protected]> Cc: Grant Likely <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
RyanHsu · Aug 11, 2010 · c4512f7 · c4512f7
1 parent 9bea3c8
commit c4512f7
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Showing 3 changed files with 18 additions and 2 deletions.
diff --git a/drivers/mmc/host/sdhci-of-core.c b/drivers/mmc/host/sdhci-of-core.c
@@ -154,6 +154,10 @@ static int __devinit sdhci_of_probe(struct of_device *ofdev,
 		host->ops = &sdhci_of_data->ops;
 	}
 
+	if (of_get_property(np, "sdhci,auto-cmd12", NULL))
+		host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
+
+
 	if (of_get_property(np, "sdhci,1-bit-only", NULL))
 		host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
 

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
@@ -818,8 +818,12 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
 	WARN_ON(!host->data);
 
 	mode = SDHCI_TRNS_BLK_CNT_EN;
-	if (data->blocks > 1)
-		mode |= SDHCI_TRNS_MULTI;
+	if (data->blocks > 1) {
+		if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
+			mode |= SDHCI_TRNS_MULTI | SDHCI_TRNS_ACMD12;
+		else
+			mode |= SDHCI_TRNS_MULTI;
+	}
 	if (data->flags & MMC_DATA_READ)
 		mode |= SDHCI_TRNS_READ;
 	if (host->flags & SDHCI_REQ_USE_DMA)
@@ -1109,6 +1113,12 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 #ifndef SDHCI_USE_LEDS_CLASS
 	sdhci_activate_led(host);
 #endif
+	if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) {
+		if (mrq->stop) {
+			mrq->data->stop = NULL;
+			mrq->stop = NULL;
+		}
+	}
 
 	host->mrq = mrq;
 

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
@@ -243,6 +243,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC		(1<<26)
 /* Controller is missing device caps. Use caps provided by host */
 #define SDHCI_QUIRK_MISSING_CAPS			(1<<27)
+/* Controller uses Auto CMD12 command to stop the transfer */
+#define SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12		(1<<28)
 
 	int			irq;		/* Device IRQ */
 	void __iomem *		ioaddr;		/* Mapped address */