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drm/i915: Readout initial hw mode. 

drm/i915: Readout initial hw mode, v2.

Atomic requires a mode blob when crtc_state->enable is true, or
you get a huge warn_on.

With a few tweaks the mode we read out from hardware could be used
as the real mode without a modeset, but this requires too much
testing, so for now force a modeset the first time the mode blob's
updated.

This preserves the old behavior, because previously we never set
the initial mode, which always meant that a modeset happened
when the mode was first set.

Changes since v1:
- Add a description in intel_modeset_readout_hw_state of how the
  recalculation is done.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2015-07-14 15:58:28 +02:00 committed by Daniel Vetter
parent 3a03dfb057
commit 5c1e342619
2 changed files with 44 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/gpu/drm/i915/intel_display.c
View File

@ -13146,7 +13146,7 @@ intel_modeset_compute_config(struct drm_atomic_state *state)
for_each_crtc_in_state(state, crtc, crtc_state, i) {
struct intel_crtc_state *pipe_config =
to_intel_crtc_state(crtc_state);
bool modeset, recalc;
bool modeset, recalc = false;
if (!crtc_state->enable) {
if (needs_modeset(crtc_state))
@ -13155,7 +13155,10 @@ intel_modeset_compute_config(struct drm_atomic_state *state)
}
modeset = needs_modeset(crtc_state);
recalc = pipe_config->quirks & PIPE_CONFIG_QUIRK_INHERITED_MODE;
/* see comment in intel_modeset_readout_hw_state */
if (!modeset && crtc_state->mode_blob != crtc->state->mode_blob &&
pipe_config->quirks & PIPE_CONFIG_QUIRK_INHERITED_MODE)
recalc = true;
if (!modeset && !recalc)
continue;
@ -13170,9 +13173,10 @@ intel_modeset_compute_config(struct drm_atomic_state *state)
if (ret)
return ret;
if (recalc && !intel_pipe_config_compare(state->dev,
if (recalc && (!i915.fastboot ||
!intel_pipe_config_compare(state->dev,
to_intel_crtc_state(crtc->state),
pipe_config, true)) {
pipe_config, true))) {
modeset = crtc_state->mode_changed = true;
ret = drm_atomic_add_affected_planes(state, crtc);
@ -15451,11 +15455,42 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
crtc->active = dev_priv->display.get_pipe_config(crtc,
crtc->config);
crtc->base.state->enable = crtc->active;
crtc->base.state->active = crtc->active;
crtc->base.enabled = crtc->active;
crtc->base.hwmode = crtc->config->base.adjusted_mode;
memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
if (crtc->base.state->active) {
intel_mode_from_pipe_config(&crtc->base.mode, crtc->config);
intel_mode_from_pipe_config(&crtc->base.state->adjusted_mode, crtc->config);
WARN_ON(drm_atomic_set_mode_for_crtc(crtc->base.state, &crtc->base.mode));
/*
* The initial mode needs to be set in order to keep
* the atomic core happy. It wants a valid mode if the
* crtc's enabled, so we do the above call.
*
* At this point some state updated by the connectors
* in their ->detect() callback has not run yet, so
* no recalculation can be done yet.
*
* Even if we could do a recalculation and modeset
* right now it would cause a double modeset if
* fbdev or userspace chooses a different initial mode.
*
* So to prevent the double modeset, fail the memcmp
* test in drm_atomic_set_mode_for_crtc to get a new
* mode blob, and compare if the mode blob changed
* when the PIPE_CONFIG_QUIRK_INHERITED_MODE quirk is
* set.
*
* If that happens, someone indicated they wanted a
* mode change, which means it's safe to do a full
* recalculation.
*/
crtc->base.state->mode.private_flags = ~0;
}
crtc->base.hwmode = crtc->config->base.adjusted_mode;
readout_plane_state(crtc, to_intel_crtc_state(crtc->base.state));
DRM_DEBUG_KMS("[CRTC:%d] hw state readout: %s\n",
@ -15532,21 +15567,6 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
intel_modeset_readout_hw_state(dev);
/*
* Now that we have the config, copy it to each CRTC struct
* Note that this could go away if we move to using crtc_config
* checking everywhere.
*/
for_each_intel_crtc(dev, crtc) {
if (crtc->active && i915.fastboot) {
intel_mode_from_pipe_config(&crtc->base.mode,
crtc->config);
DRM_DEBUG_KMS("[CRTC:%d] found active mode: ",
crtc->base.base.id);
drm_mode_debug_printmodeline(&crtc->base.mode);
}
}
/* HW state is read out, now we need to sanitize this mess. */
for_each_intel_encoder(dev, encoder) {
intel_sanitize_encoder(encoder);

11
drivers/gpu/drm/i915/intel_fbdev.c
View File

@ -483,18 +483,13 @@ retry:
* IMPORTANT: We want to use the adjusted mode (i.e.
* after the panel fitter upscaling) as the initial
* config, not the input mode, which is what crtc->mode
* usually contains. But since our current fastboot
* usually contains. But since our current
* code puts a mode derived from the post-pfit timings
* into crtc->mode this works out correctly. We don't
* use hwmode anywhere right now, so use it for this
* since the fb helper layer wants a pointer to
* something we own.
* into crtc->mode this works out correctly.
*/
DRM_DEBUG_KMS("looking for current mode on connector %s\n",
connector->name);
intel_mode_from_pipe_config(&encoder->crtc->hwmode,
to_intel_crtc(encoder->crtc)->config);
modes[i] = &encoder->crtc->hwmode;
modes[i] = &encoder->crtc->mode;
}
crtcs[i] = new_crtc;