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[4/4] mmc: mmci: add busy detect for stm32 sdmmc variant

Message ID 1551802205-32188-5-git-send-email-ludovic.Barre@st.com (mailing list archive)
State New, archived
Headers show
Series mmc: mmci: add busy detect for stm32 sdmmc variant | expand

Commit Message

Ludovic BARRE March 5, 2019, 4:10 p.m. UTC 
From: Ludovic Barre <ludovic.barre@st.com>

This patch enables busy detection for stm32 sdmmc which requires
to set data timer to define the busy timeout.
sdmmc has 2 flags:
-busyd0: inverted value of d0 line.
-busyd0end which indicates only end of busy following a cmd response.
Only one interrupt on busyd0end.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
---
 drivers/mmc/host/mmci.c | 4 ++++
 drivers/mmc/host/mmci.h | 1 +
 2 files changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index d1b7563..1011c99 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -283,6 +283,10 @@  static struct variant_data variant_stm32_sdmmc = {
 	.datalength_bits	= 25,
 	.datactrl_blocksz	= 14,
 	.stm32_idmabsize_mask	= GENMASK(12, 5),
+	.busy_detect		= true,
+	.busy_timeout		= true,
+	.busy_detect_flag	= MCI_STM32_BUSYD0,
+	.busy_detect_mask	= MCI_STM32_BUSYD0ENDMASK,
 	.init			= sdmmc_variant_init,
 };
 
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 7d9eb92..9179a6c 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -162,6 +162,7 @@ 
 #define MCI_ST_CARDBUSY		(1 << 24)
 /* Extended status bits for the STM32 variants */
 #define MCI_STM32_BUSYD0	BIT(20)
+#define MCI_STM32_BUSYD0END	BIT(21)
 
 #define MMCICLEAR		0x038
 #define MCI_CMDCRCFAILCLR	(1 << 0)