mmc: tmio: core: Add end operation into tmio_mmc_dma_ops

Related drivers like renesas_sdhi_internal_dmac are possible
to lack dma unmaping in error cases (for example response timeout).

Since tmio_mmc_finish_request() will be always called in any case,
to fix the issue, add end operation into struct tmio_mmc_dma_ops and
call the operation in tmio_mmc_finish_request() to call dma_ummap API
by the related drivers correctly.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/1590044466-28372-2-git-send-email-yoshihiro.shimoda.uh@renesas.com
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/tmio_mmc.h

@@ -118,6 +118,9 @@ struct tmio_mmc_dma_ops {
 	void (*release)(struct tmio_mmc_host *host);
 	void (*abort)(struct tmio_mmc_host *host);
 	void (*dataend)(struct tmio_mmc_host *host);
+
+	/* optional */
+	void (*end)(struct tmio_mmc_host *host);	/* held host->lock */
 };
 
 struct tmio_mmc_host {

drivers/mmc/host/tmio_mmc_core.c

@@ -57,6 +57,12 @@ static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
 		host->dma_ops->start(host, data);
 }
 
+static inline void tmio_mmc_end_dma(struct tmio_mmc_host *host)
+{
+	if (host->dma_ops && host->dma_ops->end)
+		host->dma_ops->end(host);
+}
+
 static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
 {
 	if (host->dma_ops)
@@ -797,6 +803,8 @@ static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
 
 	spin_lock_irqsave(&host->lock, flags);
 
+	tmio_mmc_end_dma(host);
+
 	mrq = host->mrq;
 	if (IS_ERR_OR_NULL(mrq)) {
 		spin_unlock_irqrestore(&host->lock, flags);