From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vincent Wan Subject: [PATCH v3 1/3] mmc:sdhci: Add a quirk for AMD SDHC transfer mode register need to be cleared for cmd without data Date: Wed, 5 Nov 2014 14:09:00 +0800 Message-ID: <1415167740-5762-1-git-send-email-vincent.wan@amd.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from mail-bl2on0113.outbound.protection.outlook.com ([65.55.169.113]:23632 "EHLO na01-bl2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750867AbaKEGJ0 (ORCPT ); Wed, 5 Nov 2014 01:09:26 -0500 Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Ulf Hansson Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Arindam Nath , Huang Rui , Wan Zongshun , Vincent Wan SDHC controller in AMD chipsets require SDHC transfer mode register to be cleared for commands without data. The issue was uncovered during testing eMMC cards on KB/ML based platforms Signed-off-by: Vincent Wan Signed-off-by: Wan Zongshun Signed-off-by: Arindam Nath Tested-by: Vikram B Tested-by: Raghavendra Swamy --- drivers/mmc/host/sdhci.c | 9 +++++++-- include/linux/mmc/sdhci.h | 2 ++ 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index f895ab0..a743d52 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -915,10 +915,15 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host, struct mmc_data *data = cmd->data; if (data == NULL) { + if (host->quirks2 & + SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) { + sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE); + } else { /* clear Auto CMD settings for no data CMDs */ - mode = sdhci_readw(host, SDHCI_TRANSFER_MODE); - sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 | + mode = sdhci_readw(host, SDHCI_TRANSFER_MODE); + sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 | SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE); + } return; } diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h index 931ac5e..ae7f357 100644 --- a/include/linux/mmc/sdhci.h +++ b/include/linux/mmc/sdhci.h @@ -102,6 +102,8 @@ struct sdhci_host { #define SDHCI_QUIRK2_STOP_WITH_TC (1<<8) /* Controller does not support 64-bit DMA */ #define SDHCI_QUIRK2_BROKEN_64_BIT_DMA (1<<9) +/* need clear transfer mode register before send cmd */ +#define SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD (1<<10) int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped address */ -- 1.8.1.2