drm/vc4: hdmi: Set a default HSM rate
When the firmware doesn't setup the HSM rate (such as when booting without an HDMI cable plugged in), its rate is 0 and thus any register access results in a CPU stall, even though HSM is enabled. Let's enforce a minimum rate at boot to avoid this issue. Fixes: 4f6e3d66 ("drm/vc4: Add runtime PM support to the HDMI encoder driver") Signed-off-by: Maxime Ripard <maxime@cerno.tech> Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org> Tested-by: Nicolas Saenz Julienne <nsaenz@kernel.org> Tested-by: Michael Stapelberg <michael@stapelberg.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20210922125419.4125779-4-maxime@cerno.tech
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