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Subject[ 38/73] drm/i915: dont check inconsistent modeset state when force-restoring
Date
3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Vetter <daniel.vetter@ffwll.ch>

commit f30da187cdcd0939288038e11fb3bfbd1b655564 upstream.

It will be only consistent once we've restored all the crtcs. Since a
bunch of other callers also want to just restore a single crtc, add a
boolean to disable checking only where it doesn't make sense.

Note that intel_modeset_setup_hw_state already has a call to
intel_modeset_check_state at the end, so we don't reduce the amount of
checking.

v2: Try harder not to create a big patch (Chris).

v3: Even smaller (still Chris). Also fix a trailing space.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
References: https://lkml.org/lkml/2013/3/16/60
Cc: Tomas Melin <tomas.melin@iki.fi>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Tomas Melin <tomas.melin@iki.fi>
Tested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/i915/intel_display.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7771,9 +7771,9 @@ intel_modeset_check_state(struct drm_dev
}
}

-int intel_set_mode(struct drm_crtc *crtc,
- struct drm_display_mode *mode,
- int x, int y, struct drm_framebuffer *fb)
+static int __intel_set_mode(struct drm_crtc *crtc,
+ struct drm_display_mode *mode,
+ int x, int y, struct drm_framebuffer *fb)
{
struct drm_device *dev = crtc->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
@@ -7863,8 +7863,6 @@ done:
if (ret && crtc->enabled) {
crtc->hwmode = *saved_hwmode;
crtc->mode = *saved_mode;
- } else {
- intel_modeset_check_state(dev);
}

out:
@@ -7872,6 +7870,20 @@ out:
return ret;
}

+int intel_set_mode(struct drm_crtc *crtc,
+ struct drm_display_mode *mode,
+ int x, int y, struct drm_framebuffer *fb)
+{
+ int ret;
+
+ ret = __intel_set_mode(crtc, mode, x, y, fb);
+
+ if (ret == 0)
+ intel_modeset_check_state(crtc->dev);
+
+ return ret;
+}
+
void intel_crtc_restore_mode(struct drm_crtc *crtc)
{
intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y, crtc->fb);
@@ -9172,8 +9184,16 @@ void intel_modeset_setup_hw_state(struct
}

if (force_restore) {
+ /*
+ * We need to use raw interfaces for restoring state to avoid
+ * checking (bogus) intermediate states.
+ */
for_each_pipe(pipe) {
- intel_crtc_restore_mode(dev_priv->pipe_to_crtc_mapping[pipe]);
+ struct drm_crtc *crtc =
+ dev_priv->pipe_to_crtc_mapping[pipe];
+
+ __intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y,
+ crtc->fb);
}

i915_redisable_vga(dev);



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