On Thursday, May 17, 2018 12:44:30 PM PDT Dhinakaran Pandiyan wrote: > On Thu, 2018-05-17 at 10:33 +0300, Jani Nikula wrote: > > On Thu, 17 May 2018, Jani Nikula <jani.nikula@xxxxxxxxx> wrote: > > > On Wed, 16 May 2018, Dhinakaran Pandiyan <dhinakaran.pandiyan@intel > > > > > > .com> wrote: > > > > On Wed, 2018-05-16 at 11:01 +0300, Jani Nikula wrote: > > > > > This reverts commit dc911f5bd8aacfcf8aabd5c26c88e04c837a938e. > > > > > > > > > > Per the report, no matter what display mode you select with > > > > > xrandr, > > > > > the > > > > > i915 driver will always select the alternate fixed mode. For > > > > > the > > > > > reporter this means that the display will always run at 40Hz > > > > > which is > > > > > quite annoying. This may be due to the mode comparison. > > > > > > > > > > But there are some other potential issues. The choice of > > > > > alt_fixed_mode > > > > > seems dubious. It's the first non-preferred mode, but there are > > > > > no > > > > > guarantees that the only difference would be refresh rate. > > > > > Similarly, > > > > > there may be more than one preferred mode in the probed modes > > > > > list, > > > > > and > > > > > the commit changes the preferred mode selection to choose the > > > > > last > > > > > one > > > > > on the list instead of the first. > > > > > > > > > > (Note that the probed modes list is the raw, unfiltered, > > > > > unsorted > > > > > list > > > > > of modes from drm_add_edid_modes(), not the pretty result after > > > > > a > > > > > drm_helper_probe_single_connector_modes() call.) > > > > > > > > > > Finally, we already have eerily similar code in place to find > > > > > the > > > > > downclock mode for DRRS that seems like could be reused here. > > > > > > > > > > Back to the drawing board. > > > > > > > > > > Note: This is a hand-crafted revert due to conflicts. If it > > > > > fails to > > > > > backport, please just try reverting the original commit > > > > > directly. > > > > > > > > > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105469 > > > > > Reported-by: Rune Petersen <rune@xxxxxxxxxxxx> > > > > > Reported-by: Mark Spencer <n7u4722r35@xxxxxxxxxxxxxxxxx> > > > > > Fixes: dc911f5bd8aa ("drm/i915/edp: Allow alternate fixed mode > > > > > for > > > > > eDP if available.") > > > > > Cc: Clint Taylor <clinton.a.taylor@xxxxxxxxx> > > > > > Cc: David Weinehall <david.weinehall@xxxxxxxxxxxxxxx> > > > > > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > > > > > Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > > > > > Cc: Jani Nikula <jani.nikula@xxxxxxxxx> > > > > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > > > > Cc: Jim Bride <jim.bride@xxxxxxxxxxxxxxx> > > > > > Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> > > > > > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > > > > > Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > > > > Cc: <stable@xxxxxxxxxxxxxxx> # v4.14+ > > > > > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > > > > > --- > > > > > drivers/gpu/drm/i915/intel_dp.c | 38 +++++----------------- > > > > > ------ > > > > > ---------- > > > > > drivers/gpu/drm/i915/intel_drv.h | 2 -- > > > > > drivers/gpu/drm/i915/intel_dsi.c | 2 +- > > > > > drivers/gpu/drm/i915/intel_dvo.c | 2 +- > > > > > drivers/gpu/drm/i915/intel_lvds.c | 3 +-- > > > > > drivers/gpu/drm/i915/intel_panel.c | 6 ------ > > > > > 6 files changed, 8 insertions(+), 45 deletions(-) > > > > > > > > > > diff --git a/drivers/gpu/drm/i915/intel_dp.c > > > > > b/drivers/gpu/drm/i915/intel_dp.c > > > > > index dde92e4af5d3..8320f0e8e3be 100644 > > > > > --- a/drivers/gpu/drm/i915/intel_dp.c > > > > > +++ b/drivers/gpu/drm/i915/intel_dp.c > > > > > @@ -1679,23 +1679,6 @@ static int intel_dp_compute_bpp(struct > > > > > intel_dp *intel_dp, > > > > > return bpp; > > > > > } > > > > > > > > > > -static bool intel_edp_compare_alt_mode(struct drm_display_mode > > > > > *m1, > > > > > - struct drm_display_mode > > > > > *m2) > > > > > -{ > > > > > - bool bres = false; > > > > > - > > > > > - if (m1 && m2) > > > > > - bres = (m1->hdisplay == m2->hdisplay && > > > > > - m1->hsync_start == m2->hsync_start && > > > > > - m1->hsync_end == m2->hsync_end && > > > > > - m1->htotal == m2->htotal && > > > > > - m1->vdisplay == m2->vdisplay && > > > > > - m1->vsync_start == m2->vsync_start && > > > > > - m1->vsync_end == m2->vsync_end && > > > > > - m1->vtotal == m2->vtotal); > > > > > - return bres; > > > > > -} > > > > > - > > > > > /* Adjust link config limits based on compliance test > > > > > requests. */ > > > > > static void > > > > > intel_dp_adjust_compliance_config(struct intel_dp *intel_dp, > > > > > @@ -1860,16 +1843,8 @@ intel_dp_compute_config(struct > > > > > intel_encoder > > > > > *encoder, > > > > > pipe_config->has_audio = intel_conn_state- > > > > > > > > > > > force_audio == HDMI_AUDIO_ON; > > > > > > > > > > > > > > > if (intel_dp_is_edp(intel_dp) && intel_connector- > > > > > > > > > > > panel.fixed_mode) { > > > > > > > > > > - struct drm_display_mode *panel_mode = > > > > > - intel_connector->panel.alt_fixed_mode; > > > > > - struct drm_display_mode *req_mode = > > > > > &pipe_config- > > > > > > > > > > > base.mode; > > > > > > > > > > - > > > > > - if (!intel_edp_compare_alt_mode(req_mode, > > > > > panel_mode)) > > > > > - panel_mode = intel_connector- > > > > > > > > > > > panel.fixed_mode; > > > > > > > > > > - > > > > > - drm_mode_debug_printmodeline(panel_mode); > > > > > - > > > > > - intel_fixed_panel_mode(panel_mode, > > > > > adjusted_mode); > > > > > + intel_fixed_panel_mode(intel_connector- > > > > > > > > > > > panel.fixed_mode, > > > > > > > > > > + adjusted_mode); > > > > > > > > > > if (INTEL_GEN(dev_priv) >= 9) { > > > > > int ret; > > > > > @@ -6159,7 +6134,6 @@ static bool > > > > > intel_edp_init_connector(struct > > > > > intel_dp *intel_dp, > > > > > struct drm_i915_private *dev_priv = to_i915(dev); > > > > > struct drm_connector *connector = &intel_connector- > > > > > > > > > > >base; > > > > > > > > > > struct drm_display_mode *fixed_mode = NULL; > > > > > - struct drm_display_mode *alt_fixed_mode = NULL; > > > > > struct drm_display_mode *downclock_mode = NULL; > > > > > bool has_dpcd; > > > > > struct drm_display_mode *scan; > > > > > @@ -6214,14 +6188,13 @@ static bool > > > > > intel_edp_init_connector(struct > > > > > intel_dp *intel_dp, > > > > > } > > > > > intel_connector->edid = edid; > > > > > > > > > > - /* prefer fixed mode from EDID if available, save an > > > > > alt > > > > > mode also */ > > > > > + /* prefer fixed mode from EDID if available */ > > > > > list_for_each_entry(scan, &connector->probed_modes, > > > > > head) { > > > > > if ((scan->type & DRM_MODE_TYPE_PREFERRED)) { > > > > > fixed_mode = drm_mode_duplicate(dev, > > > > > scan); > > > > > downclock_mode = intel_dp_drrs_init( > > > > > intel_connecto > > > > > r, > > > > > fixed_mode); > > > > > - } else if (!alt_fixed_mode) { > > > > > - alt_fixed_mode = > > > > > drm_mode_duplicate(dev, > > > > > scan); > > > > > + break; > > > > > > > > If multiple preferred modes are present, we'll now end up calling > > > > drrs_init() only for the first. I see that this is what the > > > > original > > > > code did but this revert does more than removing support for > > > > alternate > > > > modes. > > > > > > It boils down to which preferred mode is *the* preferred mode. I > > > think > > > the original code was, uh, preferrable. Note that drrs init scans > > > the > > > entire list of modes again to find the same size mode with the > > > lowest > > > refresh rate. > > > > Moreover, as you can see, the original alt mode commit had more > > subtle > > changes than catches the eye, it caused regressions, and I feel > > pretty > > strongly about getting back to the drawing board and starting over > > with > > a clean slate than trying to tweak it when we are quite frankly way > > overdue with the revert. If after that you think the drrs/downclock > > selection needs tweaking, let's do that. > > Yeah, agreed on starting with a clean slate. > > The offending commit claims alternate mode was intended to be used for > PSR testing. I don't see any psr_basic failures in BAT or any other PSR > sub-tests failing on shards, must have been a non-CI machine then. > > The revert itself looks correct, > Reviewed-by: Dhinaakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx> Hit Send too early and Cancel too late. The signature was misspelt, hope it doesn't confuse dim. _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
