[PATCH v3 1/2] mmc: cqhci: Add cqhci_set_tran_desc() callback

[Sergey Khimich]

From: Sergey Khimich <serghox@xxxxxxxxx>

There are could be specific limitations for some mmc
controllers for preparing and setting cqhci transfer
descriptors. So add callback to allow implement
driver specific function.

Signed-off-by: Sergey Khimich <serghox@xxxxxxxxx>
---
 drivers/mmc/host/cqhci-core.c | 5 +++++
 drivers/mmc/host/cqhci.h      | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
index b3d7d6d8d654..22be6b0b32ca 100644
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -516,6 +516,11 @@ static int cqhci_prep_tran_desc(struct mmc_request *mrq,
 
 	desc = get_trans_desc(cq_host, tag);
 
+	if (cq_host->ops->prep_tran_desc) {
+		cq_host->ops->prep_tran_desc(data, cq_host, desc, sg_count);
+		return 0;
+	}
+
 	for_each_sg(data->sg, sg, sg_count, i) {
 		addr = sg_dma_address(sg);
 		len = sg_dma_len(sg);
diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h
index 1a12e40a02e6..868822292ce6 100644
--- a/drivers/mmc/host/cqhci.h
+++ b/drivers/mmc/host/cqhci.h
@@ -217,6 +217,7 @@ struct cqhci_host_ops;
 struct mmc_host;
 struct mmc_request;
 struct cqhci_slot;
+struct mmc_data;
 
 struct cqhci_host {
 	const struct cqhci_host_ops *ops;
@@ -293,6 +294,9 @@ struct cqhci_host_ops {
 	int (*program_key)(struct cqhci_host *cq_host,
 			   const union cqhci_crypto_cfg_entry *cfg, int slot);
 #endif
+	void (*prep_tran_desc)(struct mmc_data *data, struct cqhci_host *cq_host,
+			       u8 *desc, int sg_count);
+
 };
 
 static inline void cqhci_writel(struct cqhci_host *host, u32 val, int reg)
-- 
2.30.2