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mmc: dw_mmc: rockchip: Don't recalc the clock when it goes off

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The "set_ios" function is called with a clock of 0 when the clock is
turning off.  There's no reason to go through all the extra Rockchip
logic (whose goal is to make sure DIV is 0 or 1) in that case.  The
Rockchip logic happened to work because the CCF will pick the lowest
possible rate when you ask it for a clock of 0, but it's silly to go
through all the remuxing and adjusting for no reason.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Doug Anderson 2014-10-14 09:39:12 -07:00 committed by Ulf Hansson
parent b19caf379c
commit e7791079ae
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/dw_mmc-rockchip.c
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@ -37,6 +37,9 @@ static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
unsigned int cclkin; unsigned int cclkin;
u32 bus_hz; u32 bus_hz;
if (ios->clock == 0)
return;
/* /*
* cclkin: source clock of mmc controller * cclkin: source clock of mmc controller
* bus_hz: card interface clock generated by CLKGEN * bus_hz: card interface clock generated by CLKGEN