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drm/tilcdc: adding some more devicetree config

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Adding support for max-pixelclock and max-width device tree
entries. As some devices that use the tilcdc hardware module
have restrictions on the allowed/tested values.  Also update DT
bindings document to reflect new parameters.

Signed-off-by: Darren Etheridge <detheridge@ti.com>
Acked-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Darren Etheridge
2013-06-21 13:52:23 -05:00
committed by Dave Airlie
parent 6bf02c66b9
commit 4e56434687
4 changed files with 65 additions and 3 deletions
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23
drivers/gpu/drm/tilcdc/tilcdc_crtc.c
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@@ -443,10 +443,29 @@ int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode)
if (mode->vdisplay > 2048)
return MODE_VIRTUAL_Y;
/*
* some devices have a maximum allowed pixel clock
* configured from the DT
*/
if (mode->clock > priv->max_pixelclock) {
DBG("Pruning mode, pixel clock too high");
return MODE_CLOCK_HIGH;
}
/*
* some devices further limit the max horizontal resolution
* configured from the DT
*/
if (mode->hdisplay > priv->max_width)
return MODE_BAD_WIDTH;
/* filter out modes that would require too much memory bandwidth: */
bandwidth = mode->hdisplay * mode->vdisplay * drm_mode_vrefresh(mode);
if (bandwidth > priv->max_bandwidth)
bandwidth = mode->hdisplay * mode->vdisplay *
drm_mode_vrefresh(mode);
if (bandwidth > priv->max_bandwidth) {
DBG("Pruning mode, exceeds defined bandwidth limit");
return MODE_BAD;
}
return MODE_OK;
}