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Commit 5d2714cd authored by Venkat Gopalakrishnan's avatar Venkat Gopalakrishnan
Browse files

mmc: Add host ops for enhanced strobe 



Some hosts may need additional steps to get HS400 functional in
enhanced strobe mode. Add host ops to facilitate that.

Change-Id: I9663830e7ccedf8bf7970d0724a4c7ce212073fd
Signed-off-by: default avatarVenkat Gopalakrishnan <venkatg@codeaurora.org>
parent 5f2cd81f

drivers/mmc/core/mmc.c

+7 −2
Original line number Diff line number Diff line
@@ -1181,7 +1181,12 @@ static int mmc_select_hs400(struct mmc_card *card) 
	mmc_set_timing(host, MMC_TIMING_MMC_HS400);

	mmc_set_bus_speed(card);



	if ((host->caps2 & MMC_CAP2_HS400_POST_TUNING) && host->ops->execute_tuning) {

	if (host->ops->enhanced_strobe) {

		mmc_host_clk_hold(host);

		err = host->ops->enhanced_strobe(host);

		mmc_host_clk_release(host);

	} else if ((host->caps2 & MMC_CAP2_HS400_POST_TUNING) &&

			host->ops->execute_tuning) {

		mmc_host_clk_hold(host);

		err = host->ops->execute_tuning(host,

				MMC_SEND_TUNING_BLOCK_HS200);
@@ -1192,7 +1197,7 @@ static int mmc_select_hs400(struct mmc_card *card) 
				mmc_hostname(host));

	}



	return 0;

	return err;

}



/*

include/linux/mmc/host.h

+1 −0
Original line number Diff line number Diff line
@@ -157,6 +157,7 @@ struct mmc_host_ops { 


	/* Prepare HS400 target operating frequency depending host driver */

	int	(*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios);

	int	(*enhanced_strobe)(struct mmc_host *host);

	int	(*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);

	void	(*hw_reset)(struct mmc_host *host);

	void	(*card_event)(struct mmc_host *host);