[RFC PATCH 1/1] dw_mmc: add quirk about using only one slot

[Jaehoon Chung <jh80.chung@samsung.com>]

If assume only using one slot, i think that dw_mci_queue_request() need not.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com
---
 drivers/mmc/host/dw_mmc.c  |    9 +++++++--
 include/linux/mmc/dw_mmc.h |    3 ++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 882d004..e3f26ea 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -673,8 +673,13 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 		return;
 	}
 
-	/* We don't support multiple blocks of weird lengths. */
-	dw_mci_queue_request(host, slot, mrq);
+	if (host->quirks & DW_MCI_QUIRK_FORCE_ONE_SLOT) {
+		slot->mrq = mrq;
+		host->state = STATE_SENDING_CMD;
+		dw_mci_start_request(host, slot);
+	} else
+		/* We don't support multiple blocks of weird lengths. */
+		dw_mci_queue_request(host, slot, mrq);
 }
 
 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index c0207a7..82f59c2 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -176,7 +176,8 @@ struct dw_mci_dma_ops {
 #define DW_MCI_QUIRK_HIGHSPEED			BIT(2)
 /* Unreliable card detection */
 #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION	BIT(3)
-
+/* Force using only one slot */
+#define DW_MCI_QUIRK_FORCE_ONE_SLOT		BIT(4)
 
 struct dma_pdata;