FAILED: patch "[PATCH] drm/amd/pm/si: Fix updating clock limits on AC/DC" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 08c9100f65299c64439e22e6057d750ae0e6c660
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026100545-whole-mutiny-321e@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 08c9100f65299c64439e22e6057d750ae0e6c660 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timur=20Krist=C3=B3f?= <timur.kristof@gmail.com>
Date: Wed, 23 Sep 2026 14:03:54 +0200
Subject: [PATCH] drm/amd/pm/si: Fix updating clock limits on AC/DC
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Assume that the AC limits are the maximum of all power states,
and the DC limits are the maximum of battery power states.
This shouldn't make any difference in practice, but is
cleaner and more robust against bogus information in the VBIOS.

Fixes: e6c5d36756e7 ("drm/amd/pm/si: Fix updating clock limits from power states")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20260923120354.1027996-2-timur.kristof@gmail.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit ef8cb9dcc7db7b7abcbdbe870a080cc81e4f0bf3)
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c b/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c
index 064f7615759c..d26be73637e3 100644
--- a/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c
+++ b/drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c
@@ -7238,6 +7238,19 @@ static void si_parse_pplib_non_clock_info(struct amdgpu_device *adev,
 		adev->pm.dpm.uvd_ps = rps;
 }
 
+static void si_update_limits(struct amdgpu_clock_and_voltage_limits *limits,
+			     struct rv7xx_pl *pl)
+{
+	if (pl->sclk > limits->sclk)
+		limits->sclk = pl->sclk;
+	if (pl->mclk > limits->mclk)
+		limits->mclk = pl->mclk;
+	if (pl->vddc > limits->vddc)
+		limits->vddc = pl->vddc;
+	if (pl->vddci > limits->vddci)
+		limits->vddci = pl->vddci;
+}
+
 static void si_parse_pplib_clock_info(struct amdgpu_device *adev,
 				      struct amdgpu_ps *rps, int index,
 				      union pplib_clock_info *clock_info)
@@ -7246,7 +7259,6 @@ static void si_parse_pplib_clock_info(struct amdgpu_device *adev,
 	struct evergreen_power_info *eg_pi = evergreen_get_pi(adev);
 	struct si_power_info *si_pi = si_get_pi(adev);
 	struct  si_ps *ps = si_get_ps(rps);
-	struct amdgpu_clock_and_voltage_limits *limits;
 	u16 leakage_voltage;
 	struct rv7xx_pl *pl = &ps->performance_levels[index];
 	int ret;
@@ -7311,26 +7323,14 @@ static void si_parse_pplib_clock_info(struct amdgpu_device *adev,
 	 * VBIOS can contain conflicting values between:
 	 * - the maximum allowed clocks and voltages on AC or DC
 	 * - the clocks and voltages in power states on AC or DC
+	 *
+	 * Assume that the AC limits are the maximum of all power states,
+	 * and the DC limits are the maximum of battery power states.
 	 */
+	si_update_limits(&adev->pm.dpm.dyn_state.max_clock_voltage_on_ac, pl);
 	if ((rps->class & ATOM_PPLIB_CLASSIFICATION_UI_MASK) ==
-	    ATOM_PPLIB_CLASSIFICATION_UI_PERFORMANCE)
-		limits = &adev->pm.dpm.dyn_state.max_clock_voltage_on_ac;
-	else if ((rps->class & ATOM_PPLIB_CLASSIFICATION_UI_MASK) ==
 		 ATOM_PPLIB_CLASSIFICATION_UI_BATTERY)
-		limits = &adev->pm.dpm.dyn_state.max_clock_voltage_on_dc;
-	else
-		limits = NULL;
-
-	if (limits) {
-		if (pl->sclk > limits->sclk)
-			limits->sclk = pl->sclk;
-		if (pl->mclk > limits->mclk)
-			limits->mclk = pl->mclk;
-		if (pl->vddc > limits->vddc)
-			limits->vddc = pl->vddc;
-		if (pl->vddci > limits->vddci)
-			limits->vddci = pl->vddci;
-	}
+		si_update_limits(&adev->pm.dpm.dyn_state.max_clock_voltage_on_dc, pl);
 }
 
 union pplib_power_state {