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Subject[PATCH V2 5/5] mmc: mmci: add busy detect for stm32 sdmmc variant
Date
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 --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 8dcb980..02a3cdd 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -264,6 +264,10 @@ 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 b43a958..ac19de8 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -167,6 +167,7 @@
#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)
--
2.7.4
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