[PATCH v2] drm/amd/pm: add get_dpm_ultimate_freq function for cyan skillfish

[Lang Yu]

Some clients(e.g., kfd) query sclk/mclk through this function.
Because cyan skillfish don't support dpm. For sclk, set min/max
to CYAN_SKILLFISH_SCLK_MIN/CYAN_SKILLFISH_SCLK_MAX(to maintain the
existing logic).For others, set both min and max to current value.

Before this patch:
 # /opt/rocm/opencl/bin/clinfo

 Max clock frequency:                           0Mhz

After this patch:
 # /opt/rocm/opencl/bin/clinfo

 Max clock frequency:                           2000Mhz

v2:
 - Maintain the existing min/max sclk logic.(Lijo)

Signed-off-by: Lang Yu <Lang.Yu at amd.com>
---
 .../amd/pm/swsmu/smu11/cyan_skillfish_ppt.c   | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/cyan_skillfish_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/cyan_skillfish_ppt.c
index 2238ee19c222..1b58fea47181 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/cyan_skillfish_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/cyan_skillfish_ppt.c
@@ -552,6 +552,40 @@ static int cyan_skillfish_od_edit_dpm_table(struct smu_context *smu,
 	return ret;
 }
 
+static int cyan_skillfish_get_dpm_ultimate_freq(struct smu_context *smu,
+						enum smu_clk_type clk_type,
+						uint32_t *min,
+						uint32_t *max)
+{
+	int ret = 0;
+
+	if (min) {
+		switch (clk_type) {
+		case SMU_GFXCLK:
+		case SMU_SCLK:
+			*min = CYAN_SKILLFISH_SCLK_MIN;
+			break;
+		default:
+			ret = cyan_skillfish_get_current_clk_freq(smu, clk_type, min);
+			break;
+		}
+	}
+
+	if (max) {
+		switch (clk_type) {
+		case SMU_GFXCLK:
+		case SMU_SCLK:
+			*max = CYAN_SKILLFISH_SCLK_MAX;
+			break;
+		default:
+			ret = cyan_skillfish_get_current_clk_freq(smu, clk_type, max);
+			break;
+		}
+	}
+
+	return ret;
+}
+
 static const struct pptable_funcs cyan_skillfish_ppt_funcs = {
 
 	.check_fw_status = smu_v11_0_check_fw_status,
@@ -565,6 +599,7 @@ static const struct pptable_funcs cyan_skillfish_ppt_funcs = {
 	.is_dpm_running = cyan_skillfish_is_dpm_running,
 	.get_gpu_metrics = cyan_skillfish_get_gpu_metrics,
 	.od_edit_dpm_table = cyan_skillfish_od_edit_dpm_table,
+	.get_dpm_ultimate_freq = cyan_skillfish_get_dpm_ultimate_freq,
 	.register_irq_handler = smu_v11_0_register_irq_handler,
 	.notify_memory_pool_location = smu_v11_0_notify_memory_pool_location,
 	.send_smc_msg_with_param = smu_cmn_send_smc_msg_with_param,
-- 
2.25.1