[Intel-gfx] [PATCH 2/6] drm/i915: Add double_wide readout and checking

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

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 at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 141f589..7abf31b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5118,6 +5118,9 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
 	if (!(tmp & PIPECONF_ENABLE))
 		return false;
 
+	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);
@@ -8708,6 +8711,8 @@ 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);
-- 
1.8.1.5