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mmc: dw_mmc: exynos: fix the finding clock sample value 

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: c537a1c5ff ("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>
This commit is contained in:
Jaehoon Chung 2021-10-22 17:21:06 +09:00 committed by Ulf Hansson
parent 162079f2dc
commit 697542bcea
1 changed files with 14 additions and 0 deletions
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14
drivers/mmc/host/dw_mmc-exynos.c
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@ -464,6 +464,18 @@ static s8 dw_mci_exynos_get_best_clksmpl(u8 candiates)
}
}
/*
* 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;
}
@ -494,6 +506,8 @@ static int dw_mci_exynos_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
priv->tuned_sample = found;
} else {
ret = -EIO;
dev_warn(&mmc->class_dev,
"There is no candiates value about clksmpl!\n");
}
return ret;