drm/i915: Add double_wide readout and checking

Read the double wide pipe information from hardware in
i9xx_get_pipe_config(), and check it in intel_pipe_config_compare()

For gen4+ double_wide is always false so the comparison can be done
on all platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
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 94c8521..d01a800 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5042,6 +5042,9 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
                }
        }
 
+       if (INTEL_INFO(dev)->gen < 4)
+               pipe_config->double_wide = tmp & PIPECONF_DOUBLE_WIDE;
+
        intel_get_pipe_timings(crtc, pipe_config);
 
        i9xx_get_pfit_config(crtc, pipe_config);
@@ -8761,6 +8764,8 @@ intel_pipe_config_compare(struct drm_device *dev,
 
        PIPE_CONF_CHECK_I(ips_enabled);
 
+       PIPE_CONF_CHECK_I(double_wide);
+
        PIPE_CONF_CHECK_I(shared_dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll);
        PIPE_CONF_CHECK_X(dpll_hw_state.dpll_md);