From f25c0f0d4f99df9725e50d282c9143fa51e84645 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Fri, 28 Feb 2025 12:51:43 -0600
Subject: [PATCH] drm/amd/display: Avoid operating on copies of backlight caps
Making a copy of the backlight caps structure between uses is unnecessary.
Refer to pointers to the same structure when using it.
Reviewed-by: Alex Hung <alex.hung@amd.com>
Link: https://lore.kernel.org/r/20250228185145.186319-4-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 52 ++++++++-----------
1 file changed, 22 insertions(+), 30 deletions(-)
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 9a5663ee1fb85..8d5daa96eeaea 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4691,48 +4691,40 @@ static int amdgpu_dm_mode_config_init(struct amdgpu_device *adev)
static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm,
int bl_idx)
{
-#if defined(CONFIG_ACPI)
- struct amdgpu_dm_backlight_caps caps;
+ struct amdgpu_dm_backlight_caps *caps = &dm->backlight_caps[bl_idx];
- memset(&caps, 0, sizeof(caps));
-
- if (dm->backlight_caps[bl_idx].caps_valid)
+ if (caps->caps_valid)
return;
- amdgpu_acpi_get_backlight_caps(&caps);
+#if defined(CONFIG_ACPI)
+ 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->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 < 0 ||
+ if (caps->max_input_signal > AMDGPU_DM_DEFAULT_MAX_BACKLIGHT ||
+ caps->min_input_signal < 0 ||
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;
+ 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)
- return;
- dm->backlight_caps[bl_idx].min_input_signal = caps.min_input_signal;
- dm->backlight_caps[bl_idx].max_input_signal = caps.max_input_signal;
- } else {
- dm->backlight_caps[bl_idx].min_input_signal =
- AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
- dm->backlight_caps[bl_idx].max_input_signal =
- AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
+ if (!caps->caps_valid) {
+ caps->min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
+ caps->max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
+ caps->caps_valid = true;
}
#else
- if (dm->backlight_caps[bl_idx].aux_support)
+ if (caps->aux_support)
return;
- dm->backlight_caps[bl_idx].min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
- dm->backlight_caps[bl_idx].max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
+ caps->min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
+ caps->max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
+ caps->caps_valid = true;
#endif
}
@@ -4786,19 +4778,19 @@ static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
int bl_idx,
u32 user_brightness)
{
- struct amdgpu_dm_backlight_caps caps;
+ struct amdgpu_dm_backlight_caps *caps;
struct dc_link *link;
u32 brightness;
bool rc, reallow_idle = false;
amdgpu_dm_update_backlight_caps(dm, bl_idx);
- caps = dm->backlight_caps[bl_idx];
+ caps = &dm->backlight_caps[bl_idx];
dm->brightness[bl_idx] = user_brightness;
/* update scratch register */
if (bl_idx == 0)
amdgpu_atombios_scratch_regs_set_backlight_level(dm->adev, dm->brightness[bl_idx]);
- brightness = convert_brightness_from_user(&caps, dm->brightness[bl_idx]);
+ brightness = convert_brightness_from_user(caps, dm->brightness[bl_idx]);
link = (struct dc_link *)dm->backlight_link[bl_idx];
/* Change brightness based on AUX property */
@@ -4808,7 +4800,7 @@ static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
reallow_idle = true;
}
- if (caps.aux_support) {
+ if (caps->aux_support) {
rc = dc_link_set_backlight_level_nits(link, true, brightness,
AUX_BL_DEFAULT_TRANSITION_TIME_MS);
if (!rc)
--
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