drm/tilcdc: Take crtc modeset lock while updating the crtc clock rate
Take crtc modeset lock while updating the crtc clock rate. To avoid a race in tilcdc_crtc_update_clk(), we do not want crtc mode to change while we update crtc clock. Signed-off-by: NJyri Sarha <jsarha@ti.com> Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
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