> -----Original Message-----
> From: Ville Syrjala <[email protected]>
> Sent: Friday, October 4, 2019 10:19 PM
> To: [email protected]
> Cc: [email protected]; Lin, Wayne <[email protected]>
> Subject: [PATCH 4/4] drm/edid: Prep for HDMI VIC aspect ratio (WIP)
>
> From: Ville Syrjälä <[email protected]>
>
> I think this should provide most of necessary logic for adding aspecr ratios
> to
> the HDMI 4k modes.
>
> Cc: Wayne Lin <[email protected]>
> Signed-off-by: Ville Syrjälä <[email protected]>
> ---
> drivers/gpu/drm/drm_edid.c | 37 +++++++++++++++++++++++++++++++------
> 1 file changed, 31 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index
> c7f9f7ca75a2..c76814edc784 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3210,6 +3210,11 @@ static enum hdmi_picture_aspect
> drm_get_cea_aspect_ratio(const u8 video_code)
> return edid_cea_modes[video_code].picture_aspect_ratio;
> }
>
> +static enum hdmi_picture_aspect drm_get_hdmi_aspect_ratio(const u8
> +video_code) {
> + return edid_4k_modes[video_code].picture_aspect_ratio;
> +}
> +
There are no picture_aspect_ratio attributes defined for modes in
edid_4k_modes[] now. Should add on those definitions.
> /*
> * Calculate the alternate clock for HDMI modes (those from the HDMI
> vendor
> * specific block).
> @@ -3236,6 +3241,9 @@ static u8
> drm_match_hdmi_mode_clock_tolerance(const struct drm_display_mode *to_
> if (!to_match->clock)
> return 0;
>
> + if (to_match->picture_aspect_ratio)
> + match_flags |= DRM_MODE_MATCH_ASPECT_RATIO;
> +
> for (vic = 1; vic < ARRAY_SIZE(edid_4k_modes); vic++) {
> const struct drm_display_mode *hdmi_mode =
> &edid_4k_modes[vic];
> unsigned int clock1, clock2;
> @@ -3271,6 +3279,9 @@ static u8 drm_match_hdmi_mode(const struct
> drm_display_mode *to_match)
> if (!to_match->clock)
> return 0;
>
> + if (to_match->picture_aspect_ratio)
> + match_flags |= DRM_MODE_MATCH_ASPECT_RATIO;
> +
> for (vic = 1; vic < ARRAY_SIZE(edid_4k_modes); vic++) {
> const struct drm_display_mode *hdmi_mode =
> &edid_4k_modes[vic];
> unsigned int clock1, clock2;
Current code in drm_match_hdmi_mdoe() & drm_match_hdmi_mode_clock_tolerance()
use hdmi_mode_alternate_clock() to find alternate clocks.
In hdmi_mode_alternate_clock(), it adds an exception for VIC 4 mode
(4096x2160@24)
due to there is no alternate clock defined for that mode in HDMI1.4b. But
HDMI2.0 adds
23.98Hz for that mode. Maybe we should also revise that part.
> @@ -5218,6 +5229,7 @@
> drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe
> *frame,
> const struct drm_display_mode *mode) {
> enum hdmi_picture_aspect picture_aspect;
> + u8 vic, hdmi_vic;
> int err;
>
> if (!frame || !mode)
> @@ -5230,7 +5242,8 @@
> drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe
> *frame,
> if (mode->flags & DRM_MODE_FLAG_DBLCLK)
> frame->pixel_repeat = 1;
>
> - frame->video_code = drm_mode_cea_vic(connector, mode);
> + vic = drm_mode_cea_vic(connector, mode);
> + hdmi_vic = drm_mode_hdmi_vic(connector, mode);
>
> frame->picture_aspect = HDMI_PICTURE_ASPECT_NONE;
>
> @@ -5244,11 +5257,15 @@
> drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe
> *frame,
>
> /*
> * Populate picture aspect ratio from either
> - * user input (if specified) or from the CEA mode list.
> + * user input (if specified) or from the CEA/HDMI mode lists.
> */
> picture_aspect = mode->picture_aspect_ratio;
> - if (picture_aspect == HDMI_PICTURE_ASPECT_NONE)
> - picture_aspect = drm_get_cea_aspect_ratio(frame->video_code);
> + if (picture_aspect == HDMI_PICTURE_ASPECT_NONE) {
> + if (vic)
> + picture_aspect = drm_get_cea_aspect_ratio(vic);
> + else if (hdmi_vic)
> + picture_aspect = drm_get_hdmi_aspect_ratio(hdmi_vic);
> + }
>
> /*
> * The infoframe can't convey anything but none, 4:3 @@ -5256,12
> +5273,20 @@ drm_hdmi_avi_infoframe_from_display_mode(struct
> hdmi_avi_infoframe *frame,
> * we can only satisfy it by specifying the right VIC.
> */
> if (picture_aspect > HDMI_PICTURE_ASPECT_16_9) {
> - if (picture_aspect !=
> - drm_get_cea_aspect_ratio(frame->video_code))
> + if (vic) {
> + if (picture_aspect != drm_get_cea_aspect_ratio(vic))
> + return -EINVAL;
> + } else if (hdmi_vic) {
> + if (picture_aspect !=
> drm_get_hdmi_aspect_ratio(hdmi_vic))
> + return -EINVAL;
> + } else {
> return -EINVAL;
> + }
> +
> picture_aspect = HDMI_PICTURE_ASPECT_NONE;
> }
>
> + frame->video_code = vic;
> frame->picture_aspect = picture_aspect;
> frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;
> frame->scan_mode = HDMI_SCAN_MODE_UNDERSCAN;
> --
> 2.21.0
--
Wayne Lin
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