diff options
| author | Darren Etheridge <detheridge@ti.com> | 2013-06-21 13:52:23 -0500 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-06-28 09:12:23 +1000 |
| commit | 4e5643468715260209e42b715e8cd9643456d2bd (patch) | |
| tree | be1c3dace6b7c53cfe8b928acca2f13ffe79f487 /drivers/gpu/drm/tilcdc/tilcdc_crtc.c | |
| parent | 6bf02c66b97379609a05bc715b96f874f2cefb33 (diff) | |
| download | linux-4e5643468715260209e42b715e8cd9643456d2bd.tar.gz linux-4e5643468715260209e42b715e8cd9643456d2bd.tar.bz2 linux-4e5643468715260209e42b715e8cd9643456d2bd.zip | |
drm/tilcdc: adding some more devicetree config
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>
Diffstat (limited to 'drivers/gpu/drm/tilcdc/tilcdc_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c index 5b68fe59e437..b5b865f4f92b 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c @@ -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; } |