From: Jaehoon Chung jh80.chung@samsung.com
commit 697542bceae51f7620af333b065dd09d213629fb upstream.
Even though there are candiates value if can't find best value, it's returned -EIO. It's not proper behavior. If there is not best value, use a first candiate value to work eMMC.
Signed-off-by: Jaehoon Chung jh80.chung@samsung.com Tested-by: Marek Szyprowski m.szyprowski@samsung.com Tested-by: Christian Hewitt christianshewitt@gmail.com Cc: stable@vger.kernel.org Fixes: c537a1c5ff63 ("mmc: dw_mmc: exynos: add variable delay tuning sequence") Link: https://lore.kernel.org/r/20211022082106.1557-1-jh80.chung@samsung.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mmc/host/dw_mmc-exynos.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
--- a/drivers/mmc/host/dw_mmc-exynos.c +++ b/drivers/mmc/host/dw_mmc-exynos.c @@ -462,6 +462,18 @@ static s8 dw_mci_exynos_get_best_clksmpl } }
+ /* + * If there is no cadiates value, then it needs to return -EIO. + * If there are candiates values and don't find bset clk sample value, + * then use a first candiates clock sample value. + */ + for (i = 0; i < iter; i++) { + __c = ror8(candiates, i); + if ((__c & 0x1) == 0x1) { + loc = i; + goto out; + } + } out: return loc; } @@ -492,6 +504,8 @@ static int dw_mci_exynos_execute_tuning( priv->tuned_sample = found; } else { ret = -EIO; + dev_warn(&mmc->class_dev, + "There is no candiates value about clksmpl!\n"); }
return ret;