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Commit 9c5efaa0 authored by Ziyang Huang's avatar Ziyang Huang Committed by Greg Kroah-Hartman
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mmc: meson-mx-sdhc: Fix initialization frozen issue

commit 8c124d99 upstream.

Commit 4bc31ede ("mmc: core: Set HS clock speed before sending
HS CMD13") set HS clock (52MHz) before switching to HS mode. For this
freq, FCLK_DIV5 will be selected and div value is 10 (reg value is 9).
Then we set rx_clk_phase to 11 or 15 which is out of range and make
hardware frozen. After we send command request, no irq will be
interrupted and the mmc driver will keep to wait for request finished,
even durning rebooting.

So let's set it to Phase 90 which should work in most cases. Then let
meson_mx_sdhc_execute_tuning() to find the accurate value for data
transfer.

If this doesn't work, maybe need to define a factor in dts.

Fixes: e4bf1b09

 ("mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host")
Signed-off-by: default avatarZiyang Huang <hzyitc@outlook.com>
Tested-by: default avatarAnand Moon <linux.amoon@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/TYZPR01MB5556A3E71554A2EC08597EA4C9CDA@TYZPR01MB5556.apcprd01.prod.exchangelabs.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 48e1d426
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