| Message ID | 20190320081110.1718-1-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/meson: fix TMDS clock filtering for DMT monitors | expand |
Hi Neil, On Wed, Mar 20, 2019 at 9:11 AM Neil Armstrong <narmstrong@baylibre.com> wrote: > > DMT monitors does not necessarely report a maximum TMDS clock > in a VSDB EDID extension. > > In this case, all modes are wrongly rejected, including > the DRM fallback EDID. > > This patch only rejects modes whith clock > max_tmds_clock if > the max_tmds_clock is specified. This will only reject > 4:2:0 HDMI2.0 modes, who reports a clock > max_tmds_clock. > > Reported-by: Maxime Jourdan <mjourdan@baylibre.com> > Fixes: d7d8fb7046b6 ("drm/meson: add HDMI div40 TMDS mode") > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > drivers/gpu/drm/meson/meson_dw_hdmi.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c > index e28814f4ea6c..563953ec6ad0 100644 > --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c > +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c > @@ -569,7 +569,8 @@ dw_hdmi_mode_valid(struct drm_connector *connector, > DRM_DEBUG_DRIVER("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); > > /* If sink max TMDS clock, we reject the mode */ > - if (mode->clock > connector->display_info.max_tmds_clock) > + if (connector->display_info.max_tmds_clock && > + mode->clock > connector->display_info.max_tmds_clock) > return MODE_BAD; > > /* Check against non-VIC supported modes */ > -- > 2.21.0 > Thanks, this patch restores HDMI output with my old 1080p TV which does not specify a max tmds clock in its EDID. (all modes were considered BAD before). Tested-by: Maxime Jourdan <mjourdan@baylibre.com> Reviewed-by: Maxime Jourdan <mjourdan@baylibre.com>
On 20/03/2019 09:11, Neil Armstrong wrote: > DMT monitors does not necessarely report a maximum TMDS clock > in a VSDB EDID extension. > > In this case, all modes are wrongly rejected, including > the DRM fallback EDID. > > This patch only rejects modes whith clock > max_tmds_clock if > the max_tmds_clock is specified. This will only reject > 4:2:0 HDMI2.0 modes, who reports a clock > max_tmds_clock. > > Reported-by: Maxime Jourdan <mjourdan@baylibre.com> > Fixes: d7d8fb7046b6 ("drm/meson: add HDMI div40 TMDS mode") > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > drivers/gpu/drm/meson/meson_dw_hdmi.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c > index e28814f4ea6c..563953ec6ad0 100644 > --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c > +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c > @@ -569,7 +569,8 @@ dw_hdmi_mode_valid(struct drm_connector *connector, > DRM_DEBUG_DRIVER("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); > > /* If sink max TMDS clock, we reject the mode */ > - if (mode->clock > connector->display_info.max_tmds_clock) > + if (connector->display_info.max_tmds_clock && > + mode->clock > connector->display_info.max_tmds_clock) > return MODE_BAD; > > /* Check against non-VIC supported modes */ > Applied to drm-misc-fixes
diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c index e28814f4ea6c..563953ec6ad0 100644 --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c @@ -569,7 +569,8 @@ dw_hdmi_mode_valid(struct drm_connector *connector, DRM_DEBUG_DRIVER("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); /* If sink max TMDS clock, we reject the mode */ - if (mode->clock > connector->display_info.max_tmds_clock) + if (connector->display_info.max_tmds_clock && + mode->clock > connector->display_info.max_tmds_clock) return MODE_BAD; /* Check against non-VIC supported modes */
DMT monitors does not necessarely report a maximum TMDS clock in a VSDB EDID extension. In this case, all modes are wrongly rejected, including the DRM fallback EDID. This patch only rejects modes whith clock > max_tmds_clock if the max_tmds_clock is specified. This will only reject 4:2:0 HDMI2.0 modes, who reports a clock > max_tmds_clock. Reported-by: Maxime Jourdan <mjourdan@baylibre.com> Fixes: d7d8fb7046b6 ("drm/meson: add HDMI div40 TMDS mode") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> --- drivers/gpu/drm/meson/meson_dw_hdmi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)