[PATCH 11/19] mmc: mmci: add variant property to check specific data constraint

[Ludovic Barre]

From: Ludovic Barre <ludovic.ba...@st.com>

This patch adds a function pointer to check specific data constraint
follow hardware variant. Needed to support the STM32 sdmmc variant
which has alignment constraint.

Signed-off-by: Ludovic Barre <ludovic.ba...@st.com>
---
 drivers/mmc/host/mmci.c | 5 +++++
 drivers/mmc/host/mmci.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index abddad7..9c00804 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -312,6 +312,8 @@ static int mmci_card_busy(struct mmc_host *mmc)
 static int mmci_validate_data(struct mmci_host *host,
                              struct mmc_data *data)
 {
+       struct variant_data *variant = host->variant;
+
        if (!data)
                return 0;
 
@@ -321,6 +323,9 @@ static int mmci_validate_data(struct mmci_host *host,
                return -EINVAL;
        }
 
+       if (variant->validate_data)
+               return variant->validate_data(host, data);
+
        return 0;
 }
 
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 12ee2e6..30d3f53 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -284,6 +284,7 @@ struct mmci_host;
  *            register.
  * @opendrain: bitmask identifying the OPENDRAIN bit inside MMCIPOWER register
  * @mmci_dma: Pointer to platform-specific DMA callbacks.
+ * @validate_data: if hardware block has specific constraint on validate data
  * @set_clk_ios: if clock procedure of variant is specific
  * @set_pwr_ios: if power procedure of variant is specific
  */
@@ -328,6 +329,7 @@ struct variant_data {
        u32                     start_err;
        u32                     opendrain;
        struct mmci_dma_ops     *mmci_dma;
+       int (*validate_data)(struct mmci_host *host, struct mmc_data *data);
        void (*set_clkreg)(struct mmci_host *host, unsigned int desired);
        void (*set_pwrreg)(struct mmci_host *host, unsigned char power_mode,
                           unsigned int pwr);
-- 
2.7.4