[PATCH v6 1/2] mmc: cqhci: Add cqhci set_tran_desc() callback

[Sergey Khimich <serghox@xxxxxxxxx>]

From: Sergey Khimich <serghox@xxxxxxxxx>

There are could be specific limitations for some mmc
controllers for 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 | 11 ++++++++---
 drivers/mmc/host/cqhci.h      |  4 ++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
index 41e94cd14109..c14d7251d0bb 100644
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -474,8 +474,8 @@ static int cqhci_dma_map(struct mmc_host *host, struct mmc_request *mrq)
 	return sg_count;
 }
 
-static void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
-				bool dma64)
+void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
+			 bool dma64)
 {
 	__le32 *attr = (__le32 __force *)desc;
 
@@ -495,6 +495,7 @@ static void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
 		dataddr[0] = cpu_to_le32(addr);
 	}
 }
+EXPORT_SYMBOL(cqhci_set_tran_desc);
 
 static int cqhci_prep_tran_desc(struct mmc_request *mrq,
 			       struct cqhci_host *cq_host, int tag)
@@ -522,7 +523,11 @@ static int cqhci_prep_tran_desc(struct mmc_request *mrq,
 
 		if ((i+1) == sg_count)
 			end = true;
-		cqhci_set_tran_desc(desc, addr, len, end, dma64);
+		if (cq_host->ops->set_tran_desc)
+			cq_host->ops->set_tran_desc(cq_host, &desc, addr, len, end, dma64);
+		else
+			cqhci_set_tran_desc(desc, addr, len, end, dma64);
+
 		desc += cq_host->trans_desc_len;
 	}
 
diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h
index 1a12e40a02e6..fab9d74445ba 100644
--- a/drivers/mmc/host/cqhci.h
+++ b/drivers/mmc/host/cqhci.h
@@ -293,6 +293,9 @@ struct cqhci_host_ops {
 	int (*program_key)(struct cqhci_host *cq_host,
 			   const union cqhci_crypto_cfg_entry *cfg, int slot);
 #endif
+	void (*set_tran_desc)(struct cqhci_host *cq_host, u8 **desc,
+			      dma_addr_t addr, int len, bool end, bool dma64);
+
 };
 
 static inline void cqhci_writel(struct cqhci_host *host, u32 val, int reg)
@@ -318,6 +321,7 @@ irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
 int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc, bool dma64);
 struct cqhci_host *cqhci_pltfm_init(struct platform_device *pdev);
 int cqhci_deactivate(struct mmc_host *mmc);
+void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end, bool dma64);
 static inline int cqhci_suspend(struct mmc_host *mmc)
 {
 	return cqhci_deactivate(mmc);
-- 
2.30.2