Hello mmc people, When booting the veyron speedy, which uses the dw_mmc driver on kernel 4.19 it hangs for ~10 minutes about 1 in 10 boots. This also occurs on kernel version 4.17.2. Tracing the hang: if the mmc block system fails to read a sector, mmc_blk_rq_error is called, which calls hw_reset, which calls _mmc_hw_reset in /drivers/mmc/core/mmc.c, which finally calls mmc_flush_cache(host->card) which hangs for ~10 minutes, before failing and resetting the emmc. If the call to mmc_flush_cache(host->card) is commented out, the hang no longer happens. The errors printed after it finally recovers are: [ 602.188052] mmc2: cache flush error -110 [ 602.690672] dwmmc_rockchip ff0f0000.dwmmc: Busy; trying anyway [ 603.193323] mmc_host mmc2: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000) The first is printed by mmc_flush_cache, and the second two are from the second half of __mmc_hw_reset, when it re inits the emmc. Could this be due to incorrect clocks?
