From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
If we ever end up doing the retry loop due to bandwidth constraints, we
would rewrite pipe_src_{w,n} based on adjusted_mode timings. But by that
time the encoder may have already replaced the adjusted_mode with a
fixed panel mode, which would then corrupt pipe_src_{w,h}.
v2: Use requested_mode and slap on a big comment from Daniel
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a91f20a..4fa97a5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8472,6 +8472,18 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
if (plane_bpp < 0)
goto fail;
+ /*
+ * Determine the real pipe dimensions. Note that stereo modes can
+ * increase the actual pipe size due to the frame doubling and
+ * insertion of additional space for blanks between the frame. This
+ * is stored in the crtc timings. We use the requested mode to do this
+ * computation to clearly distinguish it from the adjusted mode, which
+ * can be changed by the connectors in the below retry loop.
+ */
+ drm_mode_set_crtcinfo(&pipe_config->requested_mode, CRTC_STEREO_DOUBLE);
+ pipe_config->pipe_src_w = pipe_config->requested_mode.crtc_hdisplay;
+ pipe_config->pipe_src_h = pipe_config->requested_mode.crtc_vdisplay;
+
encoder_retry:
/* Ensure the port clock defaults are reset when retrying. */
pipe_config->port_clock = 0;
@@ -8480,10 +8492,6 @@ encoder_retry:
/* Fill in default crtc timings, allow encoders to overwrite them. */
drm_mode_set_crtcinfo(&pipe_config->adjusted_mode, CRTC_STEREO_DOUBLE);
- /* set_crtcinfo() may have adjusted hdisplay/vdisplay */
- pipe_config->pipe_src_w = pipe_config->adjusted_mode.crtc_hdisplay;
- pipe_config->pipe_src_h = pipe_config->adjusted_mode.crtc_vdisplay;
-
/* 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.
--
1.8.1.5
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