[PATCH] drm/amdgpu: add sysfs interface to set arbitrary sclk value for navi14

[Chengming Gui]

Add sysfs interface for arbitrary clock setting
pp_sclk - amdgpu_set_pp_sclk

Signed-off-by: Chengming Gui <Jack.Gui at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c    | 42 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/amd/powerplay/smu_v11_0.c |  9 +++++--
 2 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index b03b1eb..e32a1e1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -1036,6 +1036,40 @@ static ssize_t amdgpu_read_mask(const char *buf, size_t count, uint32_t *mask)
 	return 0;
 }
 
+static ssize_t amdgpu_set_pp_sclk(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf,
+		size_t count)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+	int ret;
+	uint32_t value;
+
+	if (amdgpu_sriov_vf(adev) && !amdgpu_sriov_is_pp_one_vf(adev))
+		return -EINVAL;
+
+	ret = pm_runtime_get_sync(ddev->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = kstrtou32(buf, 0, &value);
+	if (ret < 0)
+		return ret;
+	if (is_support_sw_smu(adev))
+		ret = smu_set_soft_freq_range(&adev->smu, SMU_SCLK, value, value);
+	else
+		return 0;
+
+	pm_runtime_mark_last_busy(ddev->dev);
+	pm_runtime_put_autosuspend(ddev->dev);
+
+	if (ret)
+		return -EINVAL;
+
+	return count;
+}
+
 static ssize_t amdgpu_set_pp_dpm_sclk(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
@@ -1797,6 +1831,8 @@ static DEVICE_ATTR(pp_force_state, S_IRUGO | S_IWUSR,
 static DEVICE_ATTR(pp_table, S_IRUGO | S_IWUSR,
 		amdgpu_get_pp_table,
 		amdgpu_set_pp_table);
+static DEVICE_ATTR(pp_sclk, S_IWUSR,
+		NULL, amdgpu_set_pp_sclk);
 static DEVICE_ATTR(pp_dpm_sclk, S_IRUGO | S_IWUSR,
 		amdgpu_get_pp_dpm_sclk,
 		amdgpu_set_pp_dpm_sclk);
@@ -3288,6 +3324,12 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
 		return ret;
 	}
 
+	ret = device_create_file(adev->dev, &dev_attr_pp_sclk);
+	if (ret) {
+		DRM_ERROR("failed to create device file pp_sclk\n");
+		return ret;
+	}
+
 	ret = device_create_file(adev->dev, &dev_attr_pp_dpm_sclk);
 	if (ret) {
 		DRM_ERROR("failed to create device file pp_dpm_sclk\n");
diff --git a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
index b06c057..9d15acf 100644
--- a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
@@ -1799,12 +1799,17 @@ int smu_v11_0_set_soft_freq_limited_range(struct smu_context *smu, enum smu_clk_
 {
 	int ret = 0, clk_id = 0;
 	uint32_t param;
+	uint32_t min_freq, max_freq;
 
 	clk_id = smu_clk_get_index(smu, clk_type);
 	if (clk_id < 0)
 		return clk_id;
 
-	if (max > 0) {
+	ret = smu_get_dpm_freq_range(smu, clk_type, &min_freq, &max_freq, true);
+	if (ret)
+		return ret;
+
+	if (max > 0 && max <=  max_freq) {
 		param = (uint32_t)((clk_id << 16) | (max & 0xffff));
 		ret = smu_send_smc_msg_with_param(smu, SMU_MSG_SetSoftMaxByFreq,
 						  param);
@@ -1812,7 +1817,7 @@ int smu_v11_0_set_soft_freq_limited_range(struct smu_context *smu, enum smu_clk_
 			return ret;
 	}
 
-	if (min > 0) {
+	if (min > 0 && min >= min_freq) {
 		param = (uint32_t)((clk_id << 16) | (min & 0xffff));
 		ret = smu_send_smc_msg_with_param(smu, SMU_MSG_SetSoftMinByFreq,
 						  param);
-- 
2.7.4