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Commit 0a446976 authored by Jerome Brunet's avatar Jerome Brunet Committed by Ulf Hansson
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mmc: meson-gx: include tx phase in the tuning process 



It has been reported that some platforms (odroid-c2) may require
a different tx phase setting to operate at high speed (hs200 and hs400)

To improve the situation, this patch includes tx phase in the tuning
process.

Fixes: d341ca88 ("mmc: meson-gx: rework tuning function")
Reported-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarJerome Brunet <jbrunet@baylibre.com>
Reviewed-by: default avatarKevin Hilman <khilman@baylibre.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 3e2b0af4

drivers/mmc/host/meson-gx-mmc.c

+18 −1
Original line number Diff line number Diff line
@@ -716,6 +716,22 @@ static int meson_mmc_clk_phase_tuning(struct mmc_host *mmc, u32 opcode, 
static int meson_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode)

{

	struct meson_host *host = mmc_priv(mmc);

	int ret;



	/*

	 * If this is the initial tuning, try to get a sane Rx starting

	 * phase before doing the actual tuning.

	 */

	if (!mmc->doing_retune) {

		ret = meson_mmc_clk_phase_tuning(mmc, opcode, host->rx_clk);



		if (ret)

			return ret;

	}



	ret = meson_mmc_clk_phase_tuning(mmc, opcode, host->tx_clk);

	if (ret)

		return ret;



	return meson_mmc_clk_phase_tuning(mmc, opcode, host->rx_clk);

}
@@ -746,8 +762,9 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 
		if (!IS_ERR(mmc->supply.vmmc))

			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);



		/* Reset rx phase */

		/* Reset phases */

		clk_set_phase(host->rx_clk, 0);

		clk_set_phase(host->tx_clk, 270);



		break;