drm/i915: don't chnage the original mode in dp_mode_fixup

We should only frob adjusted_mode. This is in preparation of
a massive patch by Laurent Pinchart to make the mode argument
const.

After the previous two prep patches the only thing left is to clean up
things a bit. I've opted to pass in an adjust_mode param to
dp_adjust_dithering because that way we can be sure to avoid
duplicating this logic between mode_valid and mode_fixup - which was
the cause behind a dp link bw calculation bug in the past.

Also mark the mode argument of pch_panel_fitting const.

v2: Split up the mode->clock => adjusted_mode->clock change,
as suggested by Chris Wilson.

Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 90cb39e..6538c46 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -234,7 +234,7 @@ intel_dp_max_data_rate(int max_link_clock, int max_lanes)
 static bool
 intel_dp_adjust_dithering(struct intel_dp *intel_dp,
                          struct drm_display_mode *mode,
-                         struct drm_display_mode *adjusted_mode)
+                         bool adjust_mode)
 {
        int max_link_clock = intel_dp_link_clock(intel_dp_max_link_bw(intel_dp));
        int max_lanes = intel_dp_max_lane_count(intel_dp);
@@ -248,8 +248,8 @@ intel_dp_adjust_dithering(struct intel_dp *intel_dp,
                if (mode_rate > max_rate)
                        return false;
 
-               if (adjusted_mode)
-                       adjusted_mode->private_flags
+               if (adjust_mode)
+                       mode->private_flags
                                |= INTEL_MODE_DP_FORCE_6BPC;
 
                return true;
@@ -272,7 +272,7 @@ intel_dp_mode_valid(struct drm_connector *connector,
                        return MODE_PANEL;
        }
 
-       if (!intel_dp_adjust_dithering(intel_dp, mode, NULL))
+       if (!intel_dp_adjust_dithering(intel_dp, mode, false))
                return MODE_CLOCK_HIGH;
 
        if (mode->clock < 10000)
@@ -712,14 +712,14 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode,
                                        mode, adjusted_mode);
        }
 
-       if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+       if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
                return false;
 
        DRM_DEBUG_KMS("DP link computation with max lane count %i "
                      "max bw %02x pixel clock %iKHz\n",
                      max_lane_count, bws[max_clock], adjusted_mode->clock);
 
-       if (!intel_dp_adjust_dithering(intel_dp, adjusted_mode, adjusted_mode))
+       if (!intel_dp_adjust_dithering(intel_dp, adjusted_mode, true))
                return false;
 
        bpp = adjusted_mode->private_flags & INTEL_MODE_DP_FORCE_6BPC ? 18 : 24;

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 6a2ae30..c35edd7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -373,7 +373,7 @@ extern void intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
                                   struct drm_display_mode *adjusted_mode);
 extern void intel_pch_panel_fitting(struct drm_device *dev,
                                    int fitting_mode,
-                                   struct drm_display_mode *mode,
+                                   const struct drm_display_mode *mode,
                                    struct drm_display_mode *adjusted_mode);
 extern u32 intel_panel_get_max_backlight(struct drm_device *dev);
 extern u32 intel_panel_get_backlight(struct drm_device *dev);

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 2a1625d..7180cc8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -56,7 +56,7 @@ intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,
 void
 intel_pch_panel_fitting(struct drm_device *dev,
                        int fitting_mode,
-                       struct drm_display_mode *mode,
+                       const struct drm_display_mode *mode,
                        struct drm_display_mode *adjusted_mode)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;