From 53fd40a90f3c0bdad86ec266ee5df833f54ace39 Mon Sep 17 00:00:00 2001 From: Jani Nikula Date: Tue, 12 Sep 2017 11:19:26 +0300 Subject: drm: handle override and firmware EDID at drm_do_get_edid() level MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Handle debugfs override edid and firmware edid at the low level to transparently and completely replace the real edid. Previously, we practically only used the modes from the override EDID, and none of the other data, such as audio parameters. This change also prevents actual EDID reads when the EDID is to be overridden, but retains the DDC probe. This is useful if the reason for preferring override EDID are problems with reading the data, or corruption of the data. Move firmware EDID loading from helper to core, as the functionality moves to lower level as well. This will result in a change of module parameter from drm_kms_helper.edid_firmware to drm.edid_firmware, which arguably makes more sense anyway. Some future work remains related to override and firmware EDID validation. Like before, no validation is done for override EDID. The firmware EDID is validated separately in the loader. Some unification and deduplication would be in order, to validate all of them at the drm_do_get_edid() level, like "real" EDIDs. v2: move firmware loading to core v3: rebase, commit message refresh Cc: Abdiel Janulgue Cc: Daniel Vetter Cc: Ville Syrjälä Tested-by: Abdiel Janulgue Reviewed-by: Ville Syrjälä Acked-by: Dave Airlie Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/1e8a710bcac46e5136c1a7b430074893c81f364a.1505203831.git.jani.nikula@intel.com --- Documentation/admin-guide/kernel-parameters.txt | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Documentation/admin-guide') diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index d9c171ce4190..9b393c29953f 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -854,7 +854,7 @@ The filter can be disabled or changed to another driver later using sysfs. - drm_kms_helper.edid_firmware=[:][,[:]] + drm.edid_firmware=[:][,[:]] Broken monitors, graphic adapters, KVMs and EDIDless panels may send no or incorrect EDID data sets. This parameter allows to specify an EDID data sets -- cgit