[PATCH 3.13 104/160] drm/i915: Don't check gmch state on inherited configs

From: Kamal Mostafa
Date: Tue Jun 10 2014 - 15:51:29 EST


3.13.11.3 -stable review patch. If anyone has any objections, please let me know.

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

From: Daniel Vetter <daniel.vetter@xxxxxxxx>

commit 9953599bc02dbc1d3330e6a0bfc6c50e9dffcac6 upstream.

... our current modeset code isn't good enough yet to handle this. The
scenario is:

1. BIOS sets up a cloned config with lvds+external screen on the same
pipe, e.g. pipe B.

2. We read out that state for pipe B and assign the gmch_pfit state to
it.

3. The initial modeset switches the lvds to pipe A but due to lack of
atomic modeset we don't recompute the config of pipe B.

-> both pipes now claim (in the sw pipe config structure) to use the
gmch_pfit, which just won't work.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74081
Tested-by: max <manikulin@xxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 23 ++++++++++++++++++-----
drivers/gpu/drm/i915/intel_drv.h | 3 ++-
2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 334cf3f..10315b0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9125,11 +9125,22 @@ intel_pipe_config_compare(struct drm_device *dev,
PIPE_CONF_CHECK_I(pipe_src_w);
PIPE_CONF_CHECK_I(pipe_src_h);

- PIPE_CONF_CHECK_I(gmch_pfit.control);
- /* pfit ratios are autocomputed by the hw on gen4+ */
- if (INTEL_INFO(dev)->gen < 4)
- PIPE_CONF_CHECK_I(gmch_pfit.pgm_ratios);
- PIPE_CONF_CHECK_I(gmch_pfit.lvds_border_bits);
+ /*
+ * FIXME: BIOS likes to set up a cloned config with lvds+external
+ * screen. Since we don't yet re-compute the pipe config when moving
+ * just the lvds port away to another pipe the sw tracking won't match.
+ *
+ * Proper atomic modesets with recomputed global state will fix this.
+ * Until then just don't check gmch state for inherited modes.
+ */
+ if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_INHERITED_MODE)) {
+ PIPE_CONF_CHECK_I(gmch_pfit.control);
+ /* pfit ratios are autocomputed by the hw on gen4+ */
+ if (INTEL_INFO(dev)->gen < 4)
+ PIPE_CONF_CHECK_I(gmch_pfit.pgm_ratios);
+ PIPE_CONF_CHECK_I(gmch_pfit.lvds_border_bits);
+ }
+
PIPE_CONF_CHECK_I(pch_pfit.enabled);
if (current_config->pch_pfit.enabled) {
PIPE_CONF_CHECK_I(pch_pfit.pos);
@@ -10919,6 +10930,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
base.head) {
memset(&crtc->config, 0, sizeof(crtc->config));

+ crtc->config.quirks |= PIPE_CONFIG_QUIRK_INHERITED_MODE;
+
crtc->active = dev_priv->display.get_pipe_config(crtc,
&crtc->config);

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 79f91f2..d6e5653 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -207,7 +207,8 @@ struct intel_crtc_config {
* tracked with quirk flags so that fastboot and state checker can act
* accordingly.
*/
-#define PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS (1<<0) /* unreliable sync mode.flags */
+#define PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS (1<<0) /* unreliable sync mode.flags */
+#define PIPE_CONFIG_QUIRK_INHERITED_MODE (1<<1) /* mode inherited from firmware */
unsigned long quirks;

/* User requested mode, only valid as a starting point to
--
1.9.1

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