diff mbox series

[V5,06/10] mmc: sdhci: Disable auto-CMD23 if stuff bits is set in CMD23 argument

Message ID 1534407596-29696-1-git-send-email-zhang.chunyan@linaro.org
State New
Headers show
Series None | expand

Commit Message

Chunyan Zhang Aug. 16, 2018, 8:19 a.m. UTC 
For version 4.10 and aboves, SDHCI_ARGUMENT2 is also used to indicate
32-bit number of blocks, so it doesn't support stuff bits in argument
of CMD23, but only block count for the following command (CMD18/25).

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>

---
 drivers/mmc/host/sdhci.c | 10 ++++++++++
 drivers/mmc/host/sdhci.h |  1 +
 2 files changed, 11 insertions(+)

-- 
2.7.4
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b3328ee..04e0904 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1729,6 +1729,16 @@  static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 		}
 	}
 
+	/*
+	 * From version 4.10 onward, ARGUMENT2 register is also used as 32-bit
+	 * block count register which doesn't support stuff bits of
+	 * CMD23 argument.
+	 */
+	if (host->version >= SDHCI_SPEC_410 &&
+	    mrq->sbc && (mrq->sbc->arg & SDHCI_ARG2_STUFF) &&
+	    (host->flags & SDHCI_AUTO_CMD23))
+		host->flags &= ~SDHCI_AUTO_CMD23;
+
 	if (!present || host->flags & SDHCI_DEVICE_DEAD) {
 		mrq->cmd->error = -ENOMEDIUM;
 		sdhci_finish_mrq(host, mrq);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index d34971ac..daf8c1e 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -28,6 +28,7 @@ 
 
 #define SDHCI_DMA_ADDRESS	0x00
 #define SDHCI_ARGUMENT2		SDHCI_DMA_ADDRESS
+#define  SDHCI_ARG2_STUFF	GENMASK(31, 16)
 #define SDHCI_32BIT_BLK_CNT	SDHCI_DMA_ADDRESS
 
 #define SDHCI_BLOCK_SIZE	0x04