Re: [PATCH v4 2/3] drm/panel-edp: Add override_edid_mode quirk for generic edp
From: Dmitry Baryshkov
Date: Mon Nov 06 2023 - 17:18:35 EST
On Mon, 6 Nov 2023 at 23:03, Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> wrote:
>
> Generic edp gets mode from edid. However, some panels report incorrect
> mode in this way, resulting in glitches on panel. Introduce a new quirk
> additional_mode to the generic edid to pick a correct hardcoded mode.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> ---
> v3->v4: no change
> ---
> drivers/gpu/drm/panel/panel-edp.c | 68 ++++++++++++++++++++++++++++---
> 1 file changed, 63 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
> index 599a949d74d1..0fb439b5efb1 100644
> --- a/drivers/gpu/drm/panel/panel-edp.c
> +++ b/drivers/gpu/drm/panel/panel-edp.c
> @@ -203,6 +203,9 @@ struct edp_panel_entry {
>
> /** @name: Name of this panel (for printing to logs). */
> const char *name;
> +
> + /** @override_edid_mode: Override the mode obtained by edid. */
> + const struct drm_display_mode *override_edid_mode;
> };
>
> struct panel_edp {
> @@ -301,6 +304,25 @@ static unsigned int panel_edp_get_display_modes(struct panel_edp *panel,
> return num;
> }
>
> +static int panel_edp_override_edid_mode(struct panel_edp *panel,
> + struct drm_connector *connector,
> + const struct drm_display_mode *override_mode)
> +{
> + struct drm_display_mode *mode;
> +
> + mode = drm_mode_duplicate(connector->dev, override_mode);
> + if (mode) {
> + mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> + drm_mode_set_name(mode);
> + drm_mode_probed_add(connector, mode);
> + return 1;
> + }
> +
> + dev_err(panel->base.dev, "failed to add additional mode\n");
> +
> + return 0;
Nit:
it is more typical to handle error cases as conditionals.
This means:
if (!mode) {
dev_err();
return 0;
}
mode->type |= ...
drm_mode_set_name();
drm_mode_probed_add();
return 1;
> +}
> +
> static int panel_edp_get_non_edid_modes(struct panel_edp *panel,
> struct drm_connector *connector)
> {
> @@ -568,6 +590,9 @@ static int panel_edp_get_modes(struct drm_panel *panel,
> {
> struct panel_edp *p = to_panel_edp(panel);
> int num = 0;
> + bool has_override_edid_mode = p->detected_panel &&
> + p->detected_panel != ERR_PTR(-EINVAL) &&
> + p->detected_panel->override_edid_mode;
>
> /* probe EDID if a DDC bus is available */
> if (p->ddc) {
> @@ -575,9 +600,18 @@ static int panel_edp_get_modes(struct drm_panel *panel,
>
> if (!p->edid)
> p->edid = drm_get_edid(connector, p->ddc);
> -
> - if (p->edid)
> - num += drm_add_edid_modes(connector, p->edid);
> + if (p->edid) {
> + if (has_override_edid_mode) {
> + /*
> + * override_edid_mode is specified. Use
> + * override_edid_mode instead of from edid.
> + */
> + num += panel_edp_override_edid_mode(p, connector,
> + p->detected_panel->override_edid_mode);
> + } else {
> + num += drm_add_edid_modes(connector, p->edid);
> + }
> + }
>
> pm_runtime_mark_last_busy(panel->dev);
> pm_runtime_put_autosuspend(panel->dev);
> @@ -950,6 +984,19 @@ static const struct panel_desc auo_b101ean01 = {
> },
> };
>
> +static const struct drm_display_mode auo_b116xa3_mode = {
> + .clock = 70589,
> + .hdisplay = 1366,
> + .hsync_start = 1366 + 40,
> + .hsync_end = 1366 + 40 + 40,
> + .htotal = 1366 + 40 + 40 + 32,
> + .vdisplay = 768,
> + .vsync_start = 768 + 10,
> + .vsync_end = 768 + 10 + 12,
> + .vtotal = 768 + 10 + 12 + 6,
> + .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
> +};
> +
> static const struct drm_display_mode auo_b116xak01_mode = {
> .clock = 69300,
> .hdisplay = 1366,
> @@ -1878,6 +1925,15 @@ static const struct panel_delay delay_200_150_e200 = {
> .delay = _delay \
> }
>
> +#define EDP_PANEL_ENTRY2(vend_chr_0, vend_chr_1, vend_chr_2, product_id, _delay, _name, _mode) \
> +{ \
> + .name = _name, \
> + .panel_id = drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, vend_chr_2, \
> + product_id), \
> + .delay = _delay, \
> + .override_edid_mode = _mode \
> +}
> +
> /*
> * This table is used to figure out power sequencing delays for panels that
> * are detected by EDID. Entries here may point to entries in the
> @@ -1895,9 +1951,11 @@ static const struct edp_panel_entry edp_panels[] = {
> EDP_PANEL_ENTRY('A', 'U', 'O', 0x239b, &delay_200_500_e50, "B116XAN06.1"),
> EDP_PANEL_ENTRY('A', 'U', 'O', 0x255c, &delay_200_500_e50, "B116XTN02.5"),
> EDP_PANEL_ENTRY('A', 'U', 'O', 0x403d, &delay_200_500_e50, "B140HAN04.0"),
> - EDP_PANEL_ENTRY('A', 'U', 'O', 0x405c, &auo_b116xak01.delay, "B116XAK01.0"),
> + EDP_PANEL_ENTRY2('A', 'U', 'O', 0x405c, &auo_b116xak01.delay, "B116XAK01.0",
> + &auo_b116xa3_mode),
> EDP_PANEL_ENTRY('A', 'U', 'O', 0x582d, &delay_200_500_e50, "B133UAN01.0"),
> - EDP_PANEL_ENTRY('A', 'U', 'O', 0x615c, &delay_200_500_e50, "B116XAN06.1"),
> + EDP_PANEL_ENTRY2('A', 'U', 'O', 0x615c, &delay_200_500_e50, "B116XAN06.1",
> + &auo_b116xa3_mode),
> EDP_PANEL_ENTRY('A', 'U', 'O', 0x635c, &delay_200_500_e50, "B116XAN06.3"),
> EDP_PANEL_ENTRY('A', 'U', 'O', 0x639c, &delay_200_500_e50, "B140HAK02.7"),
> EDP_PANEL_ENTRY('A', 'U', 'O', 0x8594, &delay_200_500_e50, "B133UAN01.0"),
> --
> 2.42.0.869.gea05f2083d-goog
>
--
With best wishes
Dmitry