[PATCH v2] drm/amd/powerplay: change sysfs pp_dpm_xxx format for navi10

[Wang, Kevin(Yang)]

v2:
set average clock value on level 1 when current clock equal
min or max clock (fine grained dpm support).

the navi10 gfxclk (sclk) support fine grained DPM,
so use level 1 to show current dpm freq in sysfs pp_dpm_xxx

Change-Id: I14daa6e30c52c89795708ec06660862bb4591036
Signed-off-by: Kevin Wang <kevin1.wang at amd.com>
---
 drivers/gpu/drm/amd/powerplay/navi10_ppt.c | 47 +++++++++++++++++++---
 1 file changed, 41 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/navi10_ppt.c b/drivers/gpu/drm/amd/powerplay/navi10_ppt.c
index 895a4e592d5a..1f721b85c0f6 100644
--- a/drivers/gpu/drm/amd/powerplay/navi10_ppt.c
+++ b/drivers/gpu/drm/amd/powerplay/navi10_ppt.c
@@ -627,11 +627,26 @@ static int navi10_get_current_clk_freq_by_table(struct smu_context *smu,
 	return ret;
 }
 
+static bool navi10_is_support_fine_grained_dpm(struct smu_context *smu, enum smu_clk_type clk_type)
+{
+	PPTable_t *pptable = smu->smu_table.driver_pptable;
+	DpmDescriptor_t *dpm_desc = NULL;
+	uint32_t clk_index = 0;
+
+	clk_index = smu_clk_get_index(smu, clk_type);
+	dpm_desc = &pptable->DpmDescriptor[clk_index];
+
+	/* 0 - Fine grained DPM, 1 - Discrete DPM */
+	return dpm_desc->SnapToDiscrete == 0 ? true : false;
+}
+
 static int navi10_print_clk_levels(struct smu_context *smu,
 			enum smu_clk_type clk_type, char *buf)
 {
 	int i, size = 0, ret = 0;
 	uint32_t cur_value = 0, value = 0, count = 0;
+	uint32_t freq_values[3] = {0};
+	uint32_t mark_index = 0;
 
 	switch (clk_type) {
 	case SMU_GFXCLK:
@@ -644,22 +659,42 @@ static int navi10_print_clk_levels(struct smu_context *smu,
 		ret = smu_get_current_clk_freq(smu, clk_type, &cur_value);
 		if (ret)
 			return size;
+
 		/* 10KHz -> MHz */
 		cur_value = cur_value / 100;
 
-		size += sprintf(buf, "current clk: %uMhz\n", cur_value);
-
 		ret = smu_get_dpm_level_count(smu, clk_type, &count);
 		if (ret)
 			return size;
 
-		for (i = 0; i < count; i++) {
-			ret = smu_get_dpm_freq_by_index(smu, clk_type, i, &value);
+		if (!navi10_is_support_fine_grained_dpm(smu, clk_type)) {
+			for (i = 0; i < count; i++) {
+				ret = smu_get_dpm_freq_by_index(smu, clk_type, i, &value);
+				if (ret)
+					return size;
+
+				size += sprintf(buf + size, "%d: %uMhz %s\n", i, value,
+						cur_value == value ? "*" : "");
+			}
+		} else {
+			ret = smu_get_dpm_freq_by_index(smu, clk_type, 0, &freq_values[0]);
+			if (ret)
+				return size;
+			ret = smu_get_dpm_freq_by_index(smu, clk_type, count - 1, &freq_values[2]);
 			if (ret)
 				return size;
 
-			size += sprintf(buf + size, "%d: %uMhz %s\n", i, value,
-					cur_value == value ? "*" : "");
+			freq_values[1] = cur_value;
+			mark_index = cur_value == freq_values[0] ? 0 :
+				     cur_value == freq_values[2] ? 2 : 1;
+			if (mark_index != 1)
+				freq_values[1] = (freq_values[0] + freq_values[2]) / 2;
+
+			for (i = 0; i < 3; i++) {
+				size += sprintf(buf + size, "%d: %uMhz %s\n", i, freq_values[i],
+						i == mark_index ? "*" : "");
+			}
+
 		}
 		break;
 	default:
-- 
2.22.0