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aw_mmc: Only change the clock if it has really changed

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This also seems to fix problem when booting Pine64 from the mmc.

Tested On:	Pine64
Tested On:	Pine64-LTS
This commit is contained in:
Emmanuel Vadot 2018-02-17 18:30:25 +00:00
parent 8bf6ff2226
commit 0f7a6420fe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329463
1 changed files with 3 additions and 2 deletions
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5
sys/arm/allwinner/aw_mmc.c
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@ -117,6 +117,7 @@ struct aw_mmc_softc {
int32_t aw_vdd;
regulator_t aw_reg_vmmc;
regulator_t aw_reg_vqmmc;
unsigned int aw_clock;
/* Fields required for DMA access. */
bus_addr_t aw_dma_desc_phys;
@ -939,8 +940,8 @@ aw_mmc_update_ios(device_t bus, device_t child)
reg &= ~AW_MMC_CTRL_DDR_MOD_SEL;
AW_MMC_WRITE_4(sc, AW_MMC_GCTL, reg);
if (ios->clock) {
clock = ios->clock;
if (ios->clock && ios->clock != sc->aw_clock) {
sc->aw_clock = clock = ios->clock;
/* Disable clock */
error = aw_mmc_update_clock(sc, 0);