If we're unable to read the EDID for a display because it's corrupt / bogus / invalid then we'll add a set of standard modes for the display. Since we have no true information about the connected display, these modes are essentially guesses but better than nothing. At the moment, none of the modes returned is marked as preferred, but the modes are sorted such that the higher resolution modes are listed first. When userspace sees these modes presented by the kernel it needs to figure out which one to pick. At least one userspace, ChromeOS [1] seems to use the rules (which seem pretty reasonable): 1. Try to pick the first mode marked as preferred. 2. Try to pick the mode which matches the first detailed timing descriptor in the EDID. 3. If no modes were marked as preferred then pick the first mode. Unfortunately, userspace's rules combined with what the kernel is doing causes us to fail section 4.2.2.6 (EDID Corruption Detection) of the DP 1.4a Link CTS. That test case says that, while it's OK to allow some implementation-specific fall-back modes if the EDID is bad that userspace should _default_ to 640x480. Let's fix this by marking 640x480 as default for DP in the no-EDID case. NOTES: - In the discussion around v3 of this patch [2] there was talk about solving this in userspace and I even implemented a patch that would have solved this for ChromeOS, but then the discussion turned back to solving this in the kernel. - Also in the discussion of v3 [2] it was requested to limit this 83;40900;0c change to just DP since folks were worried that it would break some subtle corner case on VGA or HDMI. [1] https://source.chromium.org/chromium/chromium/src/+/a051f741d0a15caff2251301efe081c30e0f4a96:ui/ozone/platform/drm/common/drm_util.cc;l=488 [2] https://lore.kernel.org/r/20220513130533.v3.1.I31ec454f8d4ffce51a7708a8092f8a6f9c929092@changeid Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> --- I put Abhinav's Reviewed-by tag from v2 here since this is nearly the same as v2. Hope this is OK. Changes in v4: - Code is back to v2, but limit to just DP. - Beefed up the commit message. Changes in v3: - Don't set preferred, just disable the sort. Changes in v2: - Don't modify drm_add_modes_noedid() 'cause that'll break others - Set 640x480 as preferred in drm_helper_probe_single_connector_modes() drivers/gpu/drm/drm_probe_helper.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index 425f56280d51..75a71649b64d 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -569,8 +569,17 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector, count = drm_add_override_edid_modes(connector); if (count == 0 && (connector->status == connector_status_connected || - connector->status == connector_status_unknown)) + connector->status == connector_status_unknown)) { count = drm_add_modes_noedid(connector, 1024, 768); + + /* + * Section 4.2.2.6 (EDID Corruption Detection) of the DP 1.4a + * Link CTS specifies that 640x480 (the official "failsafe" + * mode) needs to be the default if there's no EDID. + */ + if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort) + drm_set_preferred_mode(connector, 640, 480); + } count += drm_helper_probe_add_cmdline_mode(connector); if (count != 0) { ret = __drm_helper_update_and_validate(connector, maxX, maxY, &ctx); -- 2.36.1.255.ge46751e96f-goog
