Author: manu
Date: Mon Oct 14 21:50:44 2019
New Revision: 353527
URL: https://svnweb.freebsd.org/changeset/base/353527
Log:
arm: allwinner: Disable the clock before changing it's freq
You aren't supposed to changing the freq of a clock when it is
enable so disable the clock before changing the freq and then
re-enable it.
MFC after: 1 month
Modified:
head/sys/arm/allwinner/aw_mmc.c
Modified: head/sys/arm/allwinner/aw_mmc.c
==============================================================================
--- head/sys/arm/allwinner/aw_mmc.c Mon Oct 14 21:49:07 2019
(r353526)
+++ head/sys/arm/allwinner/aw_mmc.c Mon Oct 14 21:50:44 2019
(r353527)
@@ -1433,6 +1433,10 @@ aw_mmc_update_ios(device_t bus, device_t child)
}
/* Set the MMC clock. */
+ error = clk_disable(sc->aw_clk_mmc);
+ if (error != 0 && bootverbose)
+ device_printf(sc->aw_dev,
+ "failed to disable mmc clock: %d\n", error);
error = clk_set_freq(sc->aw_clk_mmc, clock,
CLK_SET_ROUND_DOWN);
if (error != 0) {
@@ -1441,6 +1445,10 @@ aw_mmc_update_ios(device_t bus, device_t child)
clock, error);
return (error);
}
+ error = clk_enable(sc->aw_clk_mmc);
+ if (error != 0 && bootverbose)
+ device_printf(sc->aw_dev,
+ "failed to re-enable mmc clock: %d\n", error);
if (sc->aw_mmc_conf->can_calibrate)
AW_MMC_WRITE_4(sc, AW_MMC_SAMP_DL,
AW_MMC_SAMP_DL_SW_EN);
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