linux-kernel - [PATCH 2/2] mmc: dw_mmc: Add a DISABLE_MMC quirk that sets the core mmc cap

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Date:	Tue, 21 Aug 2012 21:05:18 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	linux-mmc@...r.kernel.org
Cc:	Olof Johansson <olof@...om.net>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Thomas P Abraham <thomas.ab@...sung.com>,
	Chris Ball <cjb@...top.org>,
	Will Newton <will.newton@...tec.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	James Hogan <james.hogan@...tec.com>,
	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Doug Anderson <dianders@...omium.org>
Subject: [PATCH 2/2] mmc: dw_mmc: Add a DISABLE_MMC quirk that sets the core mmc cap

On some systems we need a way to disable MMC card support in a MMC/SD
card slot.  Add support in the dw_mmc to support this.

Signed-off-by: Doug Anderson <dianders@...omium.org>
---
 drivers/mmc/host/dw_mmc.c  |    3 +++
 include/linux/mmc/dw_mmc.h |    2 ++
 2 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index af40d22..09111bf 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1810,6 +1810,9 @@ static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
 	if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
 		mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
 
+	if (host->pdata->quirks & DW_MCI_QUIRK_DISABLE_MMC)
+		mmc->caps2 |= MMC_CAP2_NO_MMC;
+
 	if (mmc->caps2 & MMC_CAP2_POWEROFF_NOTIFY)
 		mmc->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
 	else
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index 7a7ebd3..5eaa9b9 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -201,6 +201,8 @@ struct dw_mci_dma_ops {
 #define DW_MCI_QUIRK_HIGHSPEED			BIT(2)
 /* Unreliable card detection */
 #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION	BIT(3)
+/* Only support SD cards, not MMC */
+#define DW_MCI_QUIRK_DISABLE_MMC		BIT(4)
 
 
 struct dma_pdata;
-- 
1.7.7.3

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