[PATCH v4 1/4] drm/edid: Abstract away cea_edid_modes[]
Tom Anderson
thomasanderson at google.com
Fri Dec 13 21:03:30 UTC 2019
Latest patch looks good to me, thanks for the changes!
Reviewed-by: Thomas Anderson <thomasanderson at google.com>
On Fri, Dec 13, 2019 at 07:43:45PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> We're going to need two cea mode tables (one for VICs < 128,
> another one for VICs >= 193). To that end replace the direct
> edid_cea_modes[] lookups with a function call. And we'll rename
> the array to edid_cea_modes_0[] to indicate how it's to be
> indexed.
>
> v2: Fix typos (Tom)
> Drop the pointless NULL checks in the loops (Tom)
> Assign when declaring (Tom)
> Improve the comment for cea_modes_*[] to indicate
> that one should always use cea_mode_for_vic() (Tom)
>
> Cc: Tom Anderson <thomasanderson at google.com>
> Cc: Hans Verkuil <hansverk at cisco.com>
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/drm_edid.c | 67 +++++++++++++++++++++++++-------------
> 1 file changed, 45 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 5b33b7cfd645..00a543b9daab 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -710,12 +710,11 @@ static const struct minimode extra_modes[] = {
> };
>
> /*
> - * Probably taken from CEA-861 spec.
> - * This table is converted from xorg's hw/xfree86/modes/xf86EdidModes.c.
> + * From CEA/CTA-861 spec.
> *
> - * Index using the VIC.
> + * Do not access directly, instead always use cea_mode_for_vic().
> */
> -static const struct drm_display_mode edid_cea_modes[] = {
> +static const struct drm_display_mode edid_cea_modes_0[] = {
> /* 0 - dummy, VICs start at 1 */
> { },
> /* 1 - 640x480 at 60Hz 4:3 */
> @@ -3071,6 +3070,25 @@ static u8 *drm_find_cea_extension(const struct edid *edid)
> return cea;
> }
>
> +static const struct drm_display_mode *cea_mode_for_vic(u8 vic)
> +{
> + if (!vic)
> + return NULL;
> + if (vic < ARRAY_SIZE(edid_cea_modes_0))
> + return &edid_cea_modes_0[vic];
> + return NULL;
> +}
> +
> +static u8 cea_num_vics(void)
> +{
> + return ARRAY_SIZE(edid_cea_modes_0);
> +}
> +
> +static u8 cea_next_vic(u8 vic)
> +{
> + return vic + 1;
> +}
> +
> /*
> * Calculate the alternate clock for the CEA mode
> * (60Hz vs. 59.94Hz etc.)
> @@ -3108,14 +3126,14 @@ cea_mode_alternate_timings(u8 vic, struct drm_display_mode *mode)
> * get the other variants by simply increasing the
> * vertical front porch length.
> */
> - BUILD_BUG_ON(edid_cea_modes[8].vtotal != 262 ||
> - edid_cea_modes[9].vtotal != 262 ||
> - edid_cea_modes[12].vtotal != 262 ||
> - edid_cea_modes[13].vtotal != 262 ||
> - edid_cea_modes[23].vtotal != 312 ||
> - edid_cea_modes[24].vtotal != 312 ||
> - edid_cea_modes[27].vtotal != 312 ||
> - edid_cea_modes[28].vtotal != 312);
> + BUILD_BUG_ON(cea_mode_for_vic(8)->vtotal != 262 ||
> + cea_mode_for_vic(9)->vtotal != 262 ||
> + cea_mode_for_vic(12)->vtotal != 262 ||
> + cea_mode_for_vic(13)->vtotal != 262 ||
> + cea_mode_for_vic(23)->vtotal != 312 ||
> + cea_mode_for_vic(24)->vtotal != 312 ||
> + cea_mode_for_vic(27)->vtotal != 312 ||
> + cea_mode_for_vic(28)->vtotal != 312);
>
> if (((vic == 8 || vic == 9 ||
> vic == 12 || vic == 13) && mode->vtotal < 263) ||
> @@ -3143,8 +3161,8 @@ static u8 drm_match_cea_mode_clock_tolerance(const struct drm_display_mode *to_m
> if (to_match->picture_aspect_ratio)
> match_flags |= DRM_MODE_MATCH_ASPECT_RATIO;
>
> - for (vic = 1; vic < ARRAY_SIZE(edid_cea_modes); vic++) {
> - struct drm_display_mode cea_mode = edid_cea_modes[vic];
> + for (vic = 1; vic < cea_num_vics(); vic = cea_next_vic(vic)) {
> + struct drm_display_mode cea_mode = *cea_mode_for_vic(vic);
> unsigned int clock1, clock2;
>
> /* Check both 60Hz and 59.94Hz */
> @@ -3182,8 +3200,8 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
> if (to_match->picture_aspect_ratio)
> match_flags |= DRM_MODE_MATCH_ASPECT_RATIO;
>
> - for (vic = 1; vic < ARRAY_SIZE(edid_cea_modes); vic++) {
> - struct drm_display_mode cea_mode = edid_cea_modes[vic];
> + for (vic = 1; vic < cea_num_vics(); vic = cea_next_vic(vic)) {
> + struct drm_display_mode cea_mode = *cea_mode_for_vic(vic);
> unsigned int clock1, clock2;
>
> /* Check both 60Hz and 59.94Hz */
> @@ -3206,12 +3224,17 @@ EXPORT_SYMBOL(drm_match_cea_mode);
>
> static bool drm_valid_cea_vic(u8 vic)
> {
> - return vic > 0 && vic < ARRAY_SIZE(edid_cea_modes);
> + return cea_mode_for_vic(vic) != NULL;
> }
>
> static enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code)
> {
> - return edid_cea_modes[video_code].picture_aspect_ratio;
> + const struct drm_display_mode *mode = cea_mode_for_vic(video_code);
> +
> + if (mode)
> + return mode->picture_aspect_ratio;
> +
> + return HDMI_PICTURE_ASPECT_NONE;
> }
>
> static enum hdmi_picture_aspect drm_get_hdmi_aspect_ratio(const u8 video_code)
> @@ -3323,7 +3346,7 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
> unsigned int clock1, clock2;
>
> if (drm_valid_cea_vic(vic)) {
> - cea_mode = &edid_cea_modes[vic];
> + cea_mode = cea_mode_for_vic(vic);
> clock2 = cea_mode_alternate_clock(cea_mode);
> } else {
> vic = drm_match_hdmi_mode(mode);
> @@ -3398,7 +3421,7 @@ drm_display_mode_from_vic_index(struct drm_connector *connector,
> if (!drm_valid_cea_vic(vic))
> return NULL;
>
> - newmode = drm_mode_duplicate(dev, &edid_cea_modes[vic]);
> + newmode = drm_mode_duplicate(dev, cea_mode_for_vic(vic));
> if (!newmode)
> return NULL;
>
> @@ -3432,7 +3455,7 @@ static int do_y420vdb_modes(struct drm_connector *connector,
> if (!drm_valid_cea_vic(vic))
> continue;
>
> - newmode = drm_mode_duplicate(dev, &edid_cea_modes[vic]);
> + newmode = drm_mode_duplicate(dev, cea_mode_for_vic(vic));
> if (!newmode)
> break;
> bitmap_set(hdmi->y420_vdb_modes, vic, 1);
> @@ -4001,7 +4024,7 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
> vic = drm_match_cea_mode_clock_tolerance(mode, 5);
> if (drm_valid_cea_vic(vic)) {
> type = "CEA";
> - cea_mode = &edid_cea_modes[vic];
> + cea_mode = cea_mode_for_vic(vic);
> clock1 = cea_mode->clock;
> clock2 = cea_mode_alternate_clock(cea_mode);
> } else {
> --
> 2.23.0
>
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