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authorJonathan Liu <net147@gmail.com>2018-01-09 13:03:21 +1100
committerMaxime Ripard <maxime.ripard@free-electrons.com>2018-01-11 13:25:13 +0100
commit111f4c3309397370f1fd9579754f06b82055041d (patch)
tree8896804504831fcbd831e47344016e929ab61456 /drivers/gpu/drm/radeon/rv770d.h
parentb0bb222440a5c8273f67dd37946707e6ba6ad832 (diff)
drm/sun4i: hdmi: Check for unset best_parent in sun4i_tmds_determine_rate
It is possible that if there is no exact rate match and "rounded = clk_hw_round_rate(parent, ideal)" gives high enough values (e.g. if rounded is 2 * ideal) that the condition "abs(rate - rounded / i) < abs(rate - best_parent / best_div)" is never met and best_parent is never set. This results in req->rate and req->best_parent_rate being assigned 0. To avoid this, we set best_parent to the first calculated rate if it is unset. The sun4i_tmds_calc_divider function already has a similar check. Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support") Signed-off-by: Jonathan Liu <net147@gmail.com> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180109020323.11852-2-net147@gmail.com
Diffstat (limited to 'drivers/gpu/drm/radeon/rv770d.h')
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