drm/amd/display: Fix AMDGPU_MAX_BL_LEVEL value

JIRA: https://issues.redhat.com/browse/RHEL-75958

commit 650d623737eddcffc9e56a4e7fd9e2b714938ee2
Author: Mario Limonciello <mario.limonciello@amd.com>
Date:   Mon Jun 23 12:11:13 2025 -0500

    drm/amd/display: Fix AMDGPU_MAX_BL_LEVEL value

    commit 66abb99 upstream.

    [Why]
    commit 16dc8bc ("drm/amd/display: Export full brightness range to
    userspace") adjusted the brightness range to scale to larger values, but
    missed updating AMDGPU_MAX_BL_LEVEL which is needed to make sure that
    scaling works properly with custom brightness curves.

    [How]
    As the change for max brightness of 0xFFFF only applies to devices
    supporting DC, use existing DC define MAX_BACKLIGHT_LEVEL.

    Fixes: 16dc8bc ("drm/amd/display: Export full brightness range to userspace")
    Acked-by: Alex Deucher <alexander.deucher@amd.com>
    Link: https://lore.kernel.org/r/20250623171114.1156451-1-mario.limonciello@amd.com
    Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    (cherry picked from commit 5b85204)
    Cc: stable@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: José Expósito <jexposit@redhat.com>

Author: jexposit

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -4655,16 +4655,16 @@ static int get_brightness_range(const struct amdgpu_dm_backlight_caps *caps,
 	return 1;
 }
 
-/* Rescale from [min..max] to [0..AMDGPU_MAX_BL_LEVEL] */
+/* Rescale from [min..max] to [0..MAX_BACKLIGHT_LEVEL] */
 static inline u32 scale_input_to_fw(int min, int max, u64 input)
 {
-	return DIV_ROUND_CLOSEST_ULL(input * AMDGPU_MAX_BL_LEVEL, max - min);
+	return DIV_ROUND_CLOSEST_ULL(input * MAX_BACKLIGHT_LEVEL, max - min);
 }
 
-/* Rescale from [0..AMDGPU_MAX_BL_LEVEL] to [min..max] */
+/* Rescale from [0..MAX_BACKLIGHT_LEVEL] to [min..max] */
 static inline u32 scale_fw_to_input(int min, int max, u64 input)
 {
-	return min + DIV_ROUND_CLOSEST_ULL(input * (max - min), AMDGPU_MAX_BL_LEVEL);
+	return min + DIV_ROUND_CLOSEST_ULL(input * (max - min), MAX_BACKLIGHT_LEVEL);
 }
 
 static void convert_custom_brightness(const struct amdgpu_dm_backlight_caps *caps,
@@ -4884,7 +4884,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector)
 		drm_dbg(drm, "Backlight caps: min: %d, max: %d, ac %d, dc %d\n", min, max,
 			caps->ac_level, caps->dc_level);
 	} else
-		props.brightness = props.max_brightness = AMDGPU_MAX_BL_LEVEL;
+		props.brightness = props.max_brightness = MAX_BACKLIGHT_LEVEL;
 
 	if (caps->data_points && !(amdgpu_dc_debug_mask & DC_DISABLE_CUSTOM_BRIGHTNESS_CURVE))
 		drm_info(drm, "Using custom brightness curve\n");