drm/amd/display: Validate backlight caps are sane

commit 327e62f47eb57ae5ff63de82b0815557104e439a upstream.

Currently amdgpu takes backlight caps provided by the ACPI tables
on systems as is.  If the firmware sets maximums that are too low
this means that users don't get a good experience.

To avoid having to maintain a quirk list of such systems, do a sanity
check on the values.  Check that the spread is at least half of the
values that amdgpu would use if no ACPI table was found and if not
use the amdgpu defaults.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3020
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index f0ebf686b06f220f6524b80d4c304aa3c88514e5..7731ce7762b77d924330860c2677ee376ffdee6e 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4037,6 +4037,7 @@ static int amdgpu_dm_mode_config_init(struct amdgpu_device *adev)
 
 #define AMDGPU_DM_DEFAULT_MIN_BACKLIGHT 12
 #define AMDGPU_DM_DEFAULT_MAX_BACKLIGHT 255
+#define AMDGPU_DM_MIN_SPREAD ((AMDGPU_DM_DEFAULT_MAX_BACKLIGHT - AMDGPU_DM_DEFAULT_MIN_BACKLIGHT) / 2)
 #define AUX_BL_DEFAULT_TRANSITION_TIME_MS 50
 
 static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm,
@@ -4051,6 +4052,21 @@ static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm,
                return;
 
        amdgpu_acpi_get_backlight_caps(&caps);
+
+       /* validate the firmware value is sane */
+       if (caps.caps_valid) {
+               int spread = caps.max_input_signal - caps.min_input_signal;
+
+               if (caps.max_input_signal > AMDGPU_DM_DEFAULT_MAX_BACKLIGHT ||
+                   caps.min_input_signal < AMDGPU_DM_DEFAULT_MIN_BACKLIGHT ||
+                   spread > AMDGPU_DM_DEFAULT_MAX_BACKLIGHT ||
+                   spread < AMDGPU_DM_MIN_SPREAD) {
+                       DRM_DEBUG_KMS("DM: Invalid backlight caps: min=%d, max=%d\n",
+                                     caps.min_input_signal, caps.max_input_signal);
+                       caps.caps_valid = false;
+               }
+       }
+
        if (caps.caps_valid) {
                dm->backlight_caps[bl_idx].caps_valid = true;
                if (caps.aux_support)