From bbc56fdeaa2017d0bbed05e1e832e6d7e4bdd6e0 Mon Sep 17 00:00:00 2001
From: Steven Barrett <steven@liquorix.net>
Date: Fri, 15 Mar 2024 12:36:51 -0500
Subject: ZEN: drm/amdgpu/pm: Allow override of min_power_limit with
 ignore_min_pcap

---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c   | 10 ++++++++++
 drivers/gpu/drm/amd/pm/amdgpu_pm.c        |  3 +++
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 14 ++++++++++++--
 4 files changed, 26 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -164,6 +164,7 @@ struct amdgpu_watchdog_timer {
  */
 extern int amdgpu_modeset;
 extern unsigned int amdgpu_vram_limit;
+extern int amdgpu_ignore_min_pcap;
 extern int amdgpu_vis_vram_limit;
 extern int amdgpu_gart_size;
 extern int amdgpu_gtt_size;
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -136,6 +136,7 @@ enum AMDGPU_DEBUG_MASK {
 };
 
 unsigned int amdgpu_vram_limit = UINT_MAX;
+int amdgpu_ignore_min_pcap = 0; /* do not ignore by default */
 int amdgpu_vis_vram_limit;
 int amdgpu_gart_size = -1; /* auto */
 int amdgpu_gtt_size = -1; /* auto */
@@ -260,6 +261,15 @@ struct amdgpu_watchdog_timer amdgpu_watc
 };
 
 /**
+ * DOC: ignore_min_pcap (int)
+ * Ignore the minimum power cap.
+ * Useful on graphics cards where the minimum power cap is very high.
+ * The default is 0 (Do not ignore).
+ */
+MODULE_PARM_DESC(ignore_min_pcap, "Ignore the minimum power cap");
+module_param_named(ignore_min_pcap, amdgpu_ignore_min_pcap, int, 0600);
+
+/**
  * DOC: vramlimit (int)
  * Restrict the total amount of VRAM in MiB for testing.  The default is 0 (Use full VRAM).
  */
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -3276,6 +3276,9 @@ static ssize_t amdgpu_hwmon_show_power_c
 					 struct device_attribute *attr,
 					 char *buf)
 {
+	if (amdgpu_ignore_min_pcap)
+		return sysfs_emit(buf, "%i\n", 0);
+
 	return amdgpu_hwmon_show_power_cap_generic(dev, attr, buf, PP_PWR_LIMIT_MIN);
 }
 
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -2792,7 +2792,10 @@ int smu_get_power_limit(void *handle,
 			*limit = smu->max_power_limit;
 			break;
 		case SMU_PPT_LIMIT_MIN:
-			*limit = smu->min_power_limit;
+			if (amdgpu_ignore_min_pcap)
+				*limit = 0;
+			else
+				*limit = smu->min_power_limit;
 			break;
 		default:
 			return -EINVAL;
@@ -2816,7 +2819,14 @@ static int smu_set_power_limit(void *han
 		if (smu->ppt_funcs->set_power_limit)
 			return smu->ppt_funcs->set_power_limit(smu, limit_type, limit);
 
-	if ((limit > smu->max_power_limit) || (limit < smu->min_power_limit)) {
+	if (amdgpu_ignore_min_pcap) {
+		if ((limit > smu->max_power_limit)) {
+			dev_err(smu->adev->dev,
+				"New power limit (%d) is over the max allowed %d\n",
+				limit, smu->max_power_limit);
+			return -EINVAL;
+		}
+	} else if ((limit > smu->max_power_limit) || (limit < smu->min_power_limit)) {
 		dev_err(smu->adev->dev,
 			"New power limit (%d) is out of range [%d,%d]\n",
 			limit, smu->min_power_limit, smu->max_power_limit);