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mmc: host: renesas_sdhi: Fix the actual clock 

Wrong actual clock reported, if the SD clock division ratio is other
than 1:1(bits DIV[7:0] in SD_CLK_CTRL are set to 11111111).

On high speed mode, cat /sys/kernel/debug/mmc1/ios
Without the patch:
clock:          50000000 Hz
actual clock:   200000000 Hz

After the fix:
clock:          50000000 Hz
actual clock:   50000000 Hz

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20250629203859.170850-1-biju.das.jz@bp.renesas.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Biju Das 2025-06-29 21:38:56 +01:00 committed by Ulf Hansson
parent fef12d9f5b
commit 9c174e4dac
1 changed files with 5 additions and 1 deletions
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6
drivers/mmc/host/renesas_sdhi_core.c
View File

@ -222,7 +222,11 @@ static void renesas_sdhi_set_clock(struct tmio_mmc_host *host,
clk &= ~0xff;
}
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
clock = clk & CLK_CTL_DIV_MASK;
if (clock != 0xff)
host->mmc->actual_clock /= (1 << (ffs(clock) + 1));
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clock);
if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
usleep_range(10000, 11000);