drm/i915: No panel fitter on 830M or non-mobile gen2/3 platforms
PFIT_CONTROL doesn't exist on 830M, so avoid reading it in
i9xx_get_pfit_config().
Also assume that only mobile gen2/3 chipsets have a panel fitter. This
matches the documentation, but I didn't have real hardware to verify.
Gen4 docmentation is a bit inconsistent, but experimenetation on my
LPT machine suggests that the panel fitter is available on non-mobile
gen4 platforms. At least on this machine panel fitter appears works
just fine even on VGA output.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fe2d71a..db1e0a4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5439,6 +5439,9 @@
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t tmp;
+ if (INTEL_INFO(dev)->gen <= 3 && (IS_I830(dev) || !IS_MOBILE(dev)))
+ return;
+
tmp = I915_READ(PFIT_CONTROL);
if (!(tmp & PFIT_ENABLE))
return;