| Message ID | 1438344840-3490-5-git-send-email-mika.kahola@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Jul 31, 2015 at 03:13:53PM +0300, Mika Kahola wrote: > It is possible the we request to have a mode that has > higher pixel clock than our HW can support. This patch > checks if requested pixel clock is lower than the one > supported by the HW. The requested mode is discarded > if we cannot support the requested pixel clock. > > This patch applies to LVDS. > > V2: > - removed computation for max pixel clock > > V3: > - cleanup by removing unnecessary lines > > Signed-off-by: Mika Kahola <mika.kahola@intel.com> > --- > drivers/gpu/drm/i915/intel_lvds.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c > index cb634f4..59213f9 100644 > --- a/drivers/gpu/drm/i915/intel_lvds.c > +++ b/drivers/gpu/drm/i915/intel_lvds.c > @@ -289,11 +289,14 @@ intel_lvds_mode_valid(struct drm_connector *connector, > { > struct intel_connector *intel_connector = to_intel_connector(connector); > struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode; > + int max_pixclk = to_i915(connector->dev)->max_dotclk; > > if (mode->hdisplay > fixed_mode->hdisplay) > return MODE_PANEL; > if (mode->vdisplay > fixed_mode->vdisplay) > return MODE_PANEL; > + if (mode->clock > max_pixclk) > + return MODE_CLOCK_HIGH; This should really be checking fixed_mode->clock. Though checking it every time is a bit pointless since it never changes. But what the eDP cases ends up doing as well. Maybe we should just stick the check to where we pick fixed_mode, or perhaps just have intel_panel_init() print an error if the provided modes(s) are no good? In theory that should never happen anyway. > > return MODE_OK; > } > -- > 1.9.1 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index cb634f4..59213f9 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -289,11 +289,14 @@ intel_lvds_mode_valid(struct drm_connector *connector, { struct intel_connector *intel_connector = to_intel_connector(connector); struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode; + int max_pixclk = to_i915(connector->dev)->max_dotclk; if (mode->hdisplay > fixed_mode->hdisplay) return MODE_PANEL; if (mode->vdisplay > fixed_mode->vdisplay) return MODE_PANEL; + if (mode->clock > max_pixclk) + return MODE_CLOCK_HIGH; return MODE_OK; }
It is possible the we request to have a mode that has higher pixel clock than our HW can support. This patch checks if requested pixel clock is lower than the one supported by the HW. The requested mode is discarded if we cannot support the requested pixel clock. This patch applies to LVDS. V2: - removed computation for max pixel clock V3: - cleanup by removing unnecessary lines Signed-off-by: Mika Kahola <mika.kahola@intel.com> --- drivers/gpu/drm/i915/intel_lvds.c | 3 +++ 1 file changed, 3 insertions(+)