drm/amd/powerplay: add one sysfs file to support the feature to modify gfx clock on Raven/Raven2/Picasso APU.

This patch is to add one sysfs file -- "pp_od_clk_voltage" for
Raven/Raven2/Picasso APU, which is only used by dGPU like VEGA10.
This sysfs file supports the feature to modify gfx engine clock(Mhz units), it can
be used to configure the min value and the max value for gfx clock limited in the
safe range.

Command guide:
echo "s level clock" > pp_od_clk_voltage
	s - adjust teh sclk level
	level - 0 or 1, "0" represents the min value, "1" represents the max value
	clock - the clock value(Mhz units), like 400, 800 or 1200, the value must be within the
                OD_RANGE limits.
Example:
$ cat pp_od_clk_voltage
OD_SCLK:
0:        200Mhz
1:       1400Mhz
OD_RANGE:
SCLK:     200MHz       1400MHz

$ echo "s 0 600" > pp_od_clk_voltage
$ echo "s 1 1000" > pp_od_clk_voltage
$ cat pp_od_clk_voltage
OD_SCLK:
0:        600Mhz
1:       1000Mhz
OD_RANGE:
SCLK:     200MHz       1400MHz

Signed-off-by: Xiaojian Du <Xiaojian.Du@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
index a6321f2063c1..eab9768029c1 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
@@ -911,6 +911,19 @@ static int pp_set_power_profile_mode(void *handle, long *input, uint32_t size)
 	return ret;
 }
 
+static int pp_set_fine_grain_clk_vol(void *handle, uint32_t type, long *input, uint32_t size)
+{
+	struct pp_hwmgr *hwmgr = handle;
+
+	if (!hwmgr || !hwmgr->pm_en)
+		return -EINVAL;
+
+	if (hwmgr->hwmgr_func->set_fine_grain_clk_vol == NULL)
+		return 0;
+
+	return hwmgr->hwmgr_func->set_fine_grain_clk_vol(hwmgr, type, input, size);
+}
+
 static int pp_odn_edit_dpm_table(void *handle, uint32_t type, long *input, uint32_t size)
 {
 	struct pp_hwmgr *hwmgr = handle;
@@ -920,7 +933,7 @@ static int pp_odn_edit_dpm_table(void *handle, uint32_t type, long *input, uint3
 
 	if (hwmgr->hwmgr_func->odn_edit_dpm_table == NULL) {
 		pr_info_ratelimited("%s was not implemented.\n", __func__);
-		return -EINVAL;
+		return 0;
 	}
 
 	return hwmgr->hwmgr_func->odn_edit_dpm_table(hwmgr, type, input, size);
@@ -1645,6 +1658,7 @@ static const struct amd_pm_funcs pp_dpm_funcs = {
 	.set_powergating_by_smu = pp_set_powergating_by_smu,
 	.get_power_profile_mode = pp_get_power_profile_mode,
 	.set_power_profile_mode = pp_set_power_profile_mode,
+	.set_fine_grain_clk_vol = pp_set_fine_grain_clk_vol,
 	.odn_edit_dpm_table = pp_odn_edit_dpm_table,
 	.set_mp1_state = pp_dpm_set_mp1_state,
 	.set_power_limit = pp_set_power_limit,