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drm: crtc_helper: Update hwmode before mode_set call 

Just as we provide crtc->mode pre-populated with the requested mode,
move adjusted_mode into hwmode before we call the crtc's mode_set,
making sure to restore it on failure.

Allows drivers which thoughtlessly discard adjusted_mode in their
mode_set hooks (e.g. Exynos) to use hwmode directly, and also provides
some neat symmetry with crtc->mode.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Stone 2015-03-19 04:33:03 +00:00 committed by Daniel Vetter
parent 54270952e9
commit 5a27528ade
1 changed files with 5 additions and 4 deletions
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9
drivers/gpu/drm/drm_crtc_helper.c
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@ -270,7 +270,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
struct drm_framebuffer *old_fb)
{
struct drm_device *dev = crtc->dev;
struct drm_display_mode *adjusted_mode, saved_mode;
struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
struct drm_encoder_helper_funcs *encoder_funcs;
int saved_x, saved_y;
@ -292,6 +292,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
}
saved_mode = crtc->mode;
saved_hwmode = crtc->hwmode;
saved_x = crtc->x;
saved_y = crtc->y;
@ -334,6 +335,8 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
}
DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
crtc->hwmode = *adjusted_mode;
/* Prepare the encoders and CRTCs before setting the mode. */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
@ -396,9 +399,6 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
encoder->bridge->funcs->enable(encoder->bridge);
}
/* Store real post-adjustment hardware mode. */
crtc->hwmode = *adjusted_mode;
/* Calculate and store various constants which
* are later needed by vblank and swap-completion
* timestamping. They are derived from true hwmode.
@ -411,6 +411,7 @@ done:
if (!ret) {
crtc->enabled = saved_enabled;
crtc->mode = saved_mode;
crtc->hwmode = saved_hwmode;
crtc->x = saved_x;
crtc->y = saved_y;
}