> From: Haibo Chen <[email protected]> > For FSL_USDHC, it do not implement VENDORSPEC_CKEN/PEREN/HCKEN/IPGEN, these > are reserved bits. Instead, use VENDORSPEC_FRC_SDCLK_ON to gate on/off the > card clock output. > After commit b5874b552ffa ("mmc: fsl_esdhc_imx: add wait_dat0() support"), > we meet SD3.0 card can't work at UHS mode, mmc_switch_voltage() fail because > the second mmc_wait_dat0 return -ETIMEDOUT. According to SD spec, during > voltage switch, need to gate off/on the card clock. If not set the > FRC_SDCLK_ON, > after CMD11, hardware will gate off the card clock automatically, so card do > not detect the clock off/on behavior, so will draw the data0 line low until > next command. > Fixes: b5874b552ffa ("mmc: fsl_esdhc_imx: add wait_dat0() support") > Tested-by: Tim Harvey <[email protected]> > Signed-off-by: Haibo Chen <[email protected]> Applied to u-boot-imx, master, thanks !
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