Revert "drm/i915/edp: Allow alternate fixed mode for eDP if available."

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@megahurts.dk>
Reported-by: Mark Spencer <n7u4722r35@ynzlx.anonbox.net>
Fixes: dc911f5bd8aa ("drm/i915/edp: Allow alternate fixed mode for eDP if available.")
Cc: Clint Taylor <clinton.a.taylor@intel.com>
Cc: David Weinehall <david.weinehall@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jim Bride <jim.bride@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v4.14+
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180516080110.22770-1-jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 102070940095466111f06ef89ce2b098e80544fe..be99e56cf7d91426d5b632457ad33fb6d129c2dd 100644 (file)
--- 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;
@@ -6137,7 +6112,6 @@ 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;
@@ -6192,14 +6166,13 @@ 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_connector, fixed_mode);
-               } else if (!alt_fixed_mode) {
-                       alt_fixed_mode = drm_mode_duplicate(dev, scan);
+                       break;
                }
        }
 
@@ -6236,8 +6209,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
                              pipe_name(pipe));
        }
 
-       intel_panel_init(&intel_connector->panel, fixed_mode, alt_fixed_mode,
-                        downclock_mode);
+       intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
        intel_connector->panel.backlight.power = intel_edp_backlight_power;
        intel_panel_setup_backlight(connector, pipe);
 

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index ac19da7f879085f47700dd8c46aa346a419012d6..2bf383bb4b8dd2c33da5e3a00875918d5c93cae1 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -276,7 +276,6 @@ struct intel_encoder {
 
 struct intel_panel {
        struct drm_display_mode *fixed_mode;
-       struct drm_display_mode *alt_fixed_mode;
        struct drm_display_mode *downclock_mode;
 
        /* backlight */
@@ -1855,7 +1854,6 @@ void intel_overlay_reset(struct drm_i915_private *dev_priv);
 /* intel_panel.c */
 int intel_panel_init(struct intel_panel *panel,
                     struct drm_display_mode *fixed_mode,
-                    struct drm_display_mode *alt_fixed_mode,
                     struct drm_display_mode *downclock_mode);
 void intel_panel_fini(struct intel_panel *panel);
 void intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 51a1d6868b1eac8f69d5db8b9b496fbf38cc4295..cf39ca90d887872ddb2de5e011041f785fda3996 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -1846,7 +1846,7 @@ void intel_dsi_init(struct drm_i915_private *dev_priv)
        connector->display_info.width_mm = fixed_mode->width_mm;
        connector->display_info.height_mm = fixed_mode->height_mm;
 
-       intel_panel_init(&intel_connector->panel, fixed_mode, NULL, NULL);
+       intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
        intel_panel_setup_backlight(connector, INVALID_PIPE);
 
        intel_dsi_add_properties(intel_connector);

diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index a86f0398570f634958c653bb9a89aff78e5dfab2..7b942b6c170005a4574da3a83e1fc9c060733533 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -531,7 +531,7 @@ void intel_dvo_init(struct drm_i915_private *dev_priv)
                         */
                        intel_panel_init(&intel_connector->panel,
                                         intel_dvo_get_current_mode(intel_encoder),
-                                        NULL, NULL);
+                                        NULL);
                        intel_dvo->panel_wants_dither = true;
                }
 

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index a92bb63b2f2d428563db0abac5f5ea34e7ac00d1..17f297dca2965c561b8f7323afc50232e1420878 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -1177,8 +1177,7 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
 out:
        mutex_unlock(&dev->mode_config.mutex);
 
-       intel_panel_init(&intel_connector->panel, fixed_mode, NULL,
-                        downclock_mode);
+       intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
        intel_panel_setup_backlight(connector, INVALID_PIPE);
 
        lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 41d00b1603e304ff5694cc2bd8ec8daee80bc80c..b443278e569cedb1f9d7fbe36188eb6a9f67fd70 100644 (file)
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1928,13 +1928,11 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
 
 int intel_panel_init(struct intel_panel *panel,
                     struct drm_display_mode *fixed_mode,
-                    struct drm_display_mode *alt_fixed_mode,
                     struct drm_display_mode *downclock_mode)
 {
        intel_panel_init_backlight_funcs(panel);
 
        panel->fixed_mode = fixed_mode;
-       panel->alt_fixed_mode = alt_fixed_mode;
        panel->downclock_mode = downclock_mode;
 
        return 0;
@@ -1948,10 +1946,6 @@ void intel_panel_fini(struct intel_panel *panel)
        if (panel->fixed_mode)
                drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
 
-       if (panel->alt_fixed_mode)
-               drm_mode_destroy(intel_connector->base.dev,
-                               panel->alt_fixed_mode);
-
        if (panel->downclock_mode)
                drm_mode_destroy(intel_connector->base.dev,
                                panel->downclock_mode);