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From 8dcdcc54b0dddec106bb9b68b2bba2c725c84c7b Mon Sep 17 00:00:00 2001
From: Steven Barrett <steven@liquorix.net>
Date: Fri, 15 Mar 2024 12:36:51 -0500
Subject: [PATCH] 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(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index f87d53e18..c489d3b25 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -159,6 +159,7 @@ 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;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index ea14f1c8f..bb0b636d0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -132,6 +132,7 @@ 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 */
@@ -243,6 +244,15 @@ struct amdgpu_watchdog_timer amdgpu_watchdog_timer = {
.period = 0x0, /* default to 0x0 (timeout disable) */
};
+/**
+ * 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).
diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index c11952a43..52f54a228 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -3155,6 +3155,9 @@ static ssize_t amdgpu_hwmon_show_power_cap_min(struct device *dev,
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);
}
diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index e1796ecf9..5e46bd293 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -2749,7 +2749,10 @@ 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;
@@ -2773,7 +2776,14 @@ static int smu_set_power_limit(void *handle, uint32_t limit)
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);
--
2.46.0
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