Commit 0a446976 authored by Jerome Brunet's avatar Jerome Brunet Committed by Ulf Hansson

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
...@@ -716,6 +716,22 @@ static int meson_mmc_clk_phase_tuning(struct mmc_host *mmc, u32 opcode, ...@@ -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) static int meson_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
{ {
struct meson_host *host = mmc_priv(mmc); 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); 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) ...@@ -746,8 +762,9 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (!IS_ERR(mmc->supply.vmmc)) if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd); 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->rx_clk, 0);
clk_set_phase(host->tx_clk, 270);
break; break;
......
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