From: Ville Syrjälä ville.syrjala@linux.intel.com
drm_match_cea_mode() should be able to match both the 60Hz version, and the 59.94Hz version of modes.
We only store one pixel clock value per mode in edid_cea_modes, so the other value must be calculated. Depending on the mode, edid_cea_modes contains the pixel clock for either the 60Hz version or the 59.94Hz version, so a bit of care is needed so that the calculation produces the correct result.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=46800 Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/drm_edid.c | 27 ++++++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index e233ff5..71d49f2 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2330,13 +2330,34 @@ EXPORT_SYMBOL(drm_find_cea_extension); */ u8 drm_match_cea_mode(const struct drm_display_mode *to_match) { - struct drm_display_mode *cea_mode; u8 mode;
+ if (!to_match->clock) + return 0; + for (mode = 0; mode < ARRAY_SIZE(edid_cea_modes); mode++) { - cea_mode = (struct drm_display_mode *)&edid_cea_modes[mode]; + const struct drm_display_mode *cea_mode = &edid_cea_modes[mode]; + unsigned int clock1, clock2;
- if (drm_mode_equal(to_match, cea_mode)) + clock1 = clock2 = cea_mode->clock; + + /* Check both 60Hz and 59.94Hz */ + if (cea_mode->vrefresh % 6 == 0) { + /* + * edid_cea_modes contains the 59.94Hz + * variant for 240 and 480 line modes, + * and the 60Hz variant otherwise. + */ + if (cea_mode->vdisplay == 240 || + cea_mode->vdisplay == 480) + clock1 = clock1 * 1001 / 1000; + else + clock2 = DIV_ROUND_UP(clock2 * 1000, 1001); + } + + if ((KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock1) || + KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock2)) && + drm_mode_equal_no_clocks(to_match, cea_mode)) return mode + 1; } return 0;