mmc: tmio: add generic hook to fixup after a completed request

Sadly, due to HW bugs, we need a callback to work around issues just
before completing the request.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20200902081812.1591-2-wsa+renesas@sang-engineering.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/tmio_mmc.h

@@ -179,6 +179,7 @@ struct tmio_mmc_host {
 	int (*write16_hook)(struct tmio_mmc_host *host, int addr);
 	void (*reset)(struct tmio_mmc_host *host);
 	bool (*check_retune)(struct tmio_mmc_host *host);
+	void (*fixup_request)(struct tmio_mmc_host *host, struct mmc_request *mrq);
 
 	void (*prepare_hs400_tuning)(struct tmio_mmc_host *host);
 	void (*hs400_downgrade)(struct tmio_mmc_host *host);

drivers/mmc/host/tmio_mmc_core.c

@@ -809,6 +809,9 @@ static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
 		return;
 	}
 
+	if (host->fixup_request)
+		host->fixup_request(host, mrq);
+
 	mmc_request_done(host->mmc, mrq);
 }