From mboxrd@z Thu Jan 1 00:00:00 1970 From: b29396@freescale.com (Dong Aisheng) Date: Wed, 30 Oct 2013 22:09:48 +0800 Subject: [PATCH v2 1/6] mmc: sdhci: clear auto cmd setting bits for no data cmds In-Reply-To: <1383142193-24950-1-git-send-email-b29396@freescale.com> References: <1383142193-24950-1-git-send-email-b29396@freescale.com> Message-ID: <1383142193-24950-2-git-send-email-b29396@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The auto cmd settings bits should be cleared before sending new commands or we may receive command timeout error for normal commands due to wrongly pre-sent auto cmd. e.g. we receive CMD13 timeout error due to ACMD23 is wrongly enabled by former data commands. mmc2: new high speed DDR MMC card at address 0001 mmcblk1: mmc2:0001 SEM08G 7.39 GiB mmcblk1boot0: mmc2:0001 SEM08G partition 1 2.00 MiB mmcblk1boot1: mmc2:0001 SEM08G partition 2 2.00 MiB mmcblk1rpmb: mmc2:0001 SEM08G partition 3 128 KiB mmcblk1: p1 p2 p3 p4 < p5 p6 p7 > mmc2: Timeout waiting for hardware interrupt. mmcblk1boot1: unknown partition table mmc2: Timeout waiting for hardware interrupt. mmcblk1boot0: unknown partition table Signed-off-by: Dong Aisheng --- drivers/mmc/host/sdhci.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 68b3cac..22eab3a 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -903,8 +903,13 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host, u16 mode; struct mmc_data *data = cmd->data; - if (data == NULL) + if (data == NULL) { + /* clear Auto CMD settings for no data CMDs */ + mode = sdhci_readw(host, SDHCI_TRANSFER_MODE); + sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 | + SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE); return; + } WARN_ON(!host->data); -- 1.7.2.rc3