[PATCH V2 1/2] mmc: sdhci: Let a vendor driver supply and update ADMA descriptor size

[Veerabhadrarao Badiganti]

Let a vendor driver supply the maximum descriptor size that it
can operate on. ADMA descriptor table would be allocated using this
supplied size.
If any SD Host controller is of version prior to v4.10 spec
but supports 16byte descriptor, this change allows them to supply
correct descriptor size for ADMA table allocation.

Also let a vendor driver update the descriptor size by overriding
sdhc_host->desc_size if it has to operates on a different descriptor
sizes in different conditions.

Suggested-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@xxxxxxxxxxxxxx>
---
 drivers/mmc/host/sdhci.c | 7 +++++--
 drivers/mmc/host/sdhci.h | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3140fe2..19a5ad3 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3822,9 +3822,12 @@ int sdhci_setup_host(struct sdhci_host *host)
 		void *buf;
 
 		if (host->flags & SDHCI_USE_64_BIT_DMA) {
+			if (!host->alloc_desc_sz)
+				host->alloc_desc_sz =
+					SDHCI_ADMA2_64_DESC_SZ(host);
+			host->desc_sz = host->alloc_desc_sz;
 			host->adma_table_sz = host->adma_table_cnt *
-					      SDHCI_ADMA2_64_DESC_SZ(host);
-			host->desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
+					      host->desc_sz;
 		} else {
 			host->adma_table_sz = host->adma_table_cnt *
 					      SDHCI_ADMA2_32_DESC_SZ;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 0ed3e0e..8e7c77d 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -555,6 +555,7 @@ struct sdhci_host {
 	dma_addr_t align_addr;	/* Mapped bounce buffer */
 
 	unsigned int desc_sz;	/* ADMA descriptor size */
+	unsigned int alloc_desc_sz;	/* ADMA descr. max size host supports */
 
 	struct workqueue_struct *complete_wq;	/* Request completion wq */
 	struct work_struct	complete_work;	/* Request completion work */
-- 
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