Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Cross-merge networking fixes after downstream PR (net-6.16-rc4).

Conflicts:

Documentation/netlink/specs/mptcp_pm.yaml
  9e6dd4c256d0 ("netlink: specs: mptcp: replace underscores with dashes in names")
  ec362192aa9e ("netlink: specs: fix up indentation errors")
https://lore.kernel.org/20250626122205.389c2cd4@canb.auug.org.au

Adjacent changes:

Documentation/netlink/specs/fou.yaml
  791a9ed0a40d ("netlink: specs: fou: replace underscores with dashes in names")
  880d43ca9aa4 ("netlink: specs: clean up spaces in brackets")

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 34 insertions, 21 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 d3100f641ac6..bc4cd11bfc79 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4718,9 +4718,23 @@ static int get_brightness_range(const struct amdgpu_dm_backlight_caps *caps,
 	return 1;
 }
 
+/* Rescale from [min..max] to [0..AMDGPU_MAX_BL_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);
+}
+
+/* Rescale from [0..AMDGPU_MAX_BL_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);
+}
+
 static void convert_custom_brightness(const struct amdgpu_dm_backlight_caps *caps,
-				      uint32_t *brightness)
+				      unsigned int min, unsigned int max,
+				      uint32_t *user_brightness)
 {
+	u32 brightness = scale_input_to_fw(min, max, *user_brightness);
 	u8 prev_signal = 0, prev_lum = 0;
 	int i = 0;
 
@@ -4731,7 +4745,7 @@ static void convert_custom_brightness(const struct amdgpu_dm_backlight_caps *cap
 		return;
 
 	/* choose start to run less interpolation steps */
-	if (caps->luminance_data[caps->data_points/2].input_signal > *brightness)
+	if (caps->luminance_data[caps->data_points/2].input_signal > brightness)
 		i = caps->data_points/2;
 	do {
 		u8 signal = caps->luminance_data[i].input_signal;
@@ -4742,17 +4756,18 @@ static void convert_custom_brightness(const struct amdgpu_dm_backlight_caps *cap
 		 * brightness < signal: interpolate between previous and current luminance numerator
 		 * brightness > signal: find next data point
 		 */
-		if (*brightness > signal) {
+		if (brightness > signal) {
 			prev_signal = signal;
 			prev_lum = lum;
 			i++;
 			continue;
 		}
-		if (*brightness < signal)
+		if (brightness < signal)
 			lum = prev_lum + DIV_ROUND_CLOSEST((lum - prev_lum) *
-							   (*brightness - prev_signal),
+							   (brightness - prev_signal),
 							   signal - prev_signal);
-		*brightness = DIV_ROUND_CLOSEST(lum * *brightness, 101);
+		*user_brightness = scale_fw_to_input(min, max,
+						     DIV_ROUND_CLOSEST(lum * brightness, 101));
 		return;
 	} while (i < caps->data_points);
 }
@@ -4765,11 +4780,10 @@ static u32 convert_brightness_from_user(const struct amdgpu_dm_backlight_caps *c
 	if (!get_brightness_range(caps, &min, &max))
 		return brightness;
 
-	convert_custom_brightness(caps, &brightness);
+	convert_custom_brightness(caps, min, max, &brightness);
 
-	// Rescale 0..255 to min..max
-	return min + DIV_ROUND_CLOSEST((max - min) * brightness,
-				       AMDGPU_MAX_BL_LEVEL);
+	// Rescale 0..max to min..max
+	return min + DIV_ROUND_CLOSEST_ULL((u64)(max - min) * brightness, max);
 }
 
 static u32 convert_brightness_to_user(const struct amdgpu_dm_backlight_caps *caps,
@@ -4782,8 +4796,8 @@ static u32 convert_brightness_to_user(const struct amdgpu_dm_backlight_caps *cap
 
 	if (brightness < min)
 		return 0;
-	// Rescale min..max to 0..255
-	return DIV_ROUND_CLOSEST(AMDGPU_MAX_BL_LEVEL * (brightness - min),
+	// Rescale min..max to 0..max
+	return DIV_ROUND_CLOSEST_ULL((u64)max * (brightness - min),
 				 max - min);
 }
 
@@ -4908,7 +4922,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector)
 	struct drm_device *drm = aconnector->base.dev;
 	struct amdgpu_display_manager *dm = &drm_to_adev(drm)->dm;
 	struct backlight_properties props = { 0 };
-	struct amdgpu_dm_backlight_caps caps = { 0 };
+	struct amdgpu_dm_backlight_caps *caps;
 	char bl_name[16];
 	int min, max;
 
@@ -4922,22 +4936,21 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector)
 		return;
 	}
 
-	amdgpu_acpi_get_backlight_caps(&caps);
-	if (caps.caps_valid && get_brightness_range(&caps, &min, &max)) {
+	caps = &dm->backlight_caps[aconnector->bl_idx];
+	if (get_brightness_range(caps, &min, &max)) {
 		if (power_supply_is_system_supplied() > 0)
-			props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps.ac_level, 100);
+			props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps->ac_level, 100);
 		else
-			props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps.dc_level, 100);
+			props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps->dc_level, 100);
 		/* min is zero, so max needs to be adjusted */
 		props.max_brightness = max - min;
 		drm_dbg(drm, "Backlight caps: min: %d, max: %d, ac %d, dc %d\n", min, max,
-			caps.ac_level, caps.dc_level);
+			caps->ac_level, caps->dc_level);
 	} else
-		props.brightness = AMDGPU_MAX_BL_LEVEL;
+		props.brightness = props.max_brightness = AMDGPU_MAX_BL_LEVEL;
 
-	if (caps.data_points && !(amdgpu_dc_debug_mask & DC_DISABLE_CUSTOM_BRIGHTNESS_CURVE))
+	if (caps->data_points && !(amdgpu_dc_debug_mask & DC_DISABLE_CUSTOM_BRIGHTNESS_CURVE))
 		drm_info(drm, "Using custom brightness curve\n");
-	props.max_brightness = AMDGPU_MAX_BL_LEVEL;
 	props.type = BACKLIGHT_RAW;
 
 	snprintf(bl_name, sizeof(bl_name), "amdgpu_bl%d",