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mmc: meson-gx: include tx phase in the tuning process

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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: d341ca88ee ("mmc: meson-gx: rework tuning function")
Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jerome Brunet 2017-10-02 14:27:43 +02:00 committed by Ulf Hansson
parent 3e2b0af411
commit 0a44697627
1 changed files with 18 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
drivers/mmc/host/meson-gx-mmc.c
View file

@ -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;