[Intel-gfx] [PATCH 13/13] drm/i915: clean up crtc timings computation

[Daniel Vetter]

In the old days of the crtc helpers we've only had the encoder and
crtc ->mode_fixup callbacks. So when the lvds connector wanted to
adjust the crtc timings it had to set a driver-private mode flag to
tell the crtc mode fixup code to not overwrite them with the generic
ones.

When converting things to the new infrastructure I've kept the entire
logic and only moved the flag to pipe_config->timings_set. But this
logic is pretty tricky and already caused regressions:

commit 21d8a4756af5fdf4a42e79a77cf3b6f52678d443
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Jul 12 08:07:30 2013 +0200

    drm/i915: fix pfit regression for non-autoscaled resolutions

So take advantage of the flexibility our own modeset infrastructure
affords us and prefill default crtc timings. This allows us to rip out
->timings_set. Note that we overwrite things again when retrying the
pipe config computation due to bandwidth constraints to avoid bogus
crtc timings if the encoder only does relative adjustments (which is
how the pfit code works). Only a theoretical concern though since
platforms where we retry (pch-split platforms) do not need
adjustements (since only the old gmch pfit needs that). But let's
better be safe than sorry.

Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/intel_display.c | 9 +++------
 drivers/gpu/drm/i915/intel_drv.h     | 4 ----
 drivers/gpu/drm/i915/intel_panel.c   | 3 ---
 3 files changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b07f891e..aebdadc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4108,12 +4108,6 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
 			return -EINVAL;
 	}
 
-	/* All interlaced capable intel hw wants timings in frames. Note though
-	 * that intel_lvds_compute_config does some funny tricks with the crtc
-	 * timings, so we need to be careful not to clobber these.*/
-	if (!pipe_config->timings_set)
-		drm_mode_set_crtcinfo(adjusted_mode, 0);
-
 	/* Cantiga+ cannot handle modes with a hsync front porch of 0.
 	 * WaPruneModeWithIncorrectHsyncOffset:ctg,elk,ilk,snb,ivb,vlv,hsw.
 	 */
@@ -7882,6 +7876,9 @@ encoder_retry:
 	pipe_config->port_clock = 0;
 	pipe_config->pixel_multiplier = 1;
 
+	/* Fill in default crtc timings, allow encoders to overwrite them. */
+	drm_mode_set_crtcinfo(&pipe_config->adjusted_mode, 0);
+
 	/* Pass our mode to the connectors and the CRTC to give them a chance to
 	 * adjust it according to limitations or connector properties, and also
 	 * a chance to reject the mode entirely.
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 31087ff..a9eca0e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -208,10 +208,6 @@ struct intel_crtc_config {
 
 	struct drm_display_mode requested_mode;
 	struct drm_display_mode adjusted_mode;
-	/* This flag must be set by the encoder's compute_config callback if it
-	 * changes the crtc timings in the mode to prevent the crtc fixup from
-	 * overwriting them.  Currently only lvds needs that. */
-	bool timings_set;
 	/* Whether to set up the PCH/FDI. Note that we never allow sharing
 	 * between pch encoders and cpu encoders. */
 	bool has_pch_encoder;
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 67e2c1f..01b5a51 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -194,9 +194,6 @@ void intel_gmch_panel_fitting(struct intel_crtc *intel_crtc,
 	    adjusted_mode->vdisplay == mode->vdisplay)
 		goto out;
 
-	drm_mode_set_crtcinfo(adjusted_mode, 0);
-	pipe_config->timings_set = true;
-
 	switch (fitting_mode) {
 	case DRM_MODE_SCALE_CENTER:
 		/*
-- 
1.8.1.4