[PATCH v3 1/4] drm/edid: Abstract away cea_edid_modes[]
Sharma, Shashank
shashank.sharma at intel.com
Thu Oct 3 08:16:16 UTC 2019
Hello Ville,
On 9/25/2019 7:24 PM, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> We're going to need two cea mode tables (on 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 indicathe how it's to be
Should we call it something which indicates the spec version, instead of
a random '0', like edid_cea_861_F_modes[] and the next one as _G_modes
or CTA_3 modes ?
> indexed.
>
> Cc: Hans Verkuil <hansverk at cisco.com>
> Cc: Shashank Sharma <shashank.sharma at intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
> drivers/gpu/drm/drm_edid.c | 80 +++++++++++++++++++++++++++-----------
> 1 file changed, 58 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 3c9703b08491..b700fc075257 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -707,12 +707,11 @@ 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.
> + * Index with 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 */
> @@ -3067,6 +3066,25 @@ 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;
Is there any specific reason for adding a new helper function, just to
return vic + 1 ?
> +}
> +
> /*
> * Calculate the alternate clock for the CEA mode
> * (60Hz vs. 59.94Hz etc.)
> @@ -3104,14 +3122,14 @@ 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) ||
> @@ -3139,10 +3157,16 @@ 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)) {
> + const struct drm_display_mode *mode = cea_mode_for_vic(vic);
> + struct drm_display_mode cea_mode;
> unsigned int clock1, clock2;
>
> + if (!mode)
> + continue;
> +
> + cea_mode = *mode;
> +
> /* Check both 60Hz and 59.94Hz */
> clock1 = cea_mode.clock;
> clock2 = cea_mode_alternate_clock(&cea_mode);
> @@ -3178,10 +3202,16 @@ 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)) {
Again, why not just vic+=1 :) ?
> + const struct drm_display_mode *mode = cea_mode_for_vic(vic);
> + struct drm_display_mode cea_mode;
> unsigned int clock1, clock2;
>
> + if (!mode)
> + continue;
> +
> + cea_mode = *mode;
> +
> /* Check both 60Hz and 59.94Hz */
> clock1 = cea_mode.clock;
> clock2 = cea_mode_alternate_clock(&cea_mode);
> @@ -3202,7 +3232,7 @@ 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;
> }
>
> /**
> @@ -3214,7 +3244,13 @@ static bool drm_valid_cea_vic(u8 vic)
> */
> 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;
> +
> + mode = cea_mode_for_vic(video_code);
> + if (mode)
> + return mode->picture_aspect_ratio;
> +
> + return HDMI_PICTURE_ASPECT_NONE;
> }
> EXPORT_SYMBOL(drm_get_cea_aspect_ratio);
>
> @@ -3323,7 +3359,7 @@ 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 +3434,7 @@ 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 +3468,7 @@ 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 +4037,7 @@ 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 {
- Shashank
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