[PATCH] drm/amd/pm: add the reset function of the pp_od_voltage_clk sysfs file for RV/RV2/PCO APU

[Xiaojian Du]

From: Xiaojian Du <xiaojian.du at amd.com>

From: Xiaojian Du <Xiaojian.Du at amd.com>

This patch is to add the reset function of the pp_od_voltage_clk sysfs
file for Raven/Raven2/Picasso APU.
If the min and max sclk frequence are configured, this function can
be used to restore the default sclk frequence.

Command guide:
echo "r" > pp_od_clk_voltage
        r - reset the sclk level

Example:
1) check the default sclk frequence
        $ cat pp_od_clk_voltage
        OD_SCLK:
        0:        200Mhz
        1:       1400Mhz
        OD_RANGE:
        SCLK:     200MHz       1400MHz
2) use "s" -- set command to configure the min or max sclk frequence
        $ 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
3) use "r" -- reset command to restore the default sclk frequence range
        $ echo "r" > pp_od_clk_voltage
        $ cat pp_od_clk_voltage
        OD_SCLK:
        0:        200Mhz
        1:       1400Mhz
        OD_RANGE:
        SCLK:     200MHz       1400MHz

Signed-off-by: Xiaojian Du <Xiaojian.Du at amd.com>
---
 .../drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c  | 32 ++++++++++++++-----
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c
index cf60f3992303..bbe7f101acbf 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c
@@ -1421,18 +1421,34 @@ static int smu10_set_fine_grain_clk_vol(struct pp_hwmgr *hwmgr,
 		return -EINVAL;
 	}
 
-	if (size != 2) {
-		pr_err("Input parameter number not correct\n");
-		return -EINVAL;
-	}
-
 	if (type == PP_OD_EDIT_SCLK_VDDC_TABLE) {
-		if (input[0] == 0)
+		if (size != 2) {
+			pr_err("Input parameter number not correct\n");
+			return -EINVAL;
+		}
+
+		if (input[0] == 0) {
 			smu10_set_hard_min_gfxclk_by_freq(hwmgr, input[1]);
-		else if (input[0] == 1)
+		} else if (input[0] == 1) {
 			smu10_set_soft_max_gfxclk_by_freq(hwmgr, input[1]);
-		else
+		} else {
 			return -EINVAL;
+		}
+	} else if (type == PP_OD_RESTORE_DEFAULT_TABLE) {
+		if (size != 0) {
+			pr_err("Input parameter number not correct\n");
+			return -EINVAL;
+		}
+
+		uint32_t min_freq, max_freq = 0;
+
+		smum_send_msg_to_smc(hwmgr, PPSMC_MSG_GetMinGfxclkFrequency, &min_freq);
+		smu10_set_hard_min_gfxclk_by_freq(hwmgr, min_freq);
+		smum_send_msg_to_smc(hwmgr, PPSMC_MSG_GetMaxGfxclkFrequency, &max_freq);
+		smu10_set_soft_max_gfxclk_by_freq(hwmgr, max_freq);
+
+	} else {
+		return -EINVAL;
 	}
 
 	return 0;
-- 
2.17.1