drm/amd/pm: reverse mclk clocks levels for SMU v13.0.5

This patch reverses the DPM clocks levels output of pp_dpm_mclk.

On dGPUs and older APUs we expose the levels from lowest clocks
to highest clocks. But for some APUs, the clocks levels that from
the DFPstateTable are given the reversed orders by PMFW. Like the
memory DPM clocks that are exposed by pp_dpm_mclk.

It's not intuitive that they are reversed on these APUs. All tools
and software that talks to the driver then has to know different ways
to interpret the data depending on the asic.

So we need to reverse them to expose the clocks levels from the
driver consistently.

Signed-off-by: Tim Huang <Tim.Huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_5_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_5_ppt.c
index 66445964efbd1e5a94c7cfa3d2bbfca7b76e8c89..0081fa607e02e4d4b8578cf1b696855b97a871a6 100644 (file)
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_5_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_5_ppt.c
@@ -866,7 +866,7 @@ out:
 static int smu_v13_0_5_print_clk_levels(struct smu_context *smu,
                                enum smu_clk_type clk_type, char *buf)
 {
-       int i, size = 0, ret = 0;
+       int i, idx, size = 0, ret = 0;
        uint32_t cur_value = 0, value = 0, count = 0;
        uint32_t min = 0, max = 0;
 
@@ -898,7 +898,8 @@ static int smu_v13_0_5_print_clk_levels(struct smu_context *smu,
                        goto print_clk_out;
 
                for (i = 0; i < count; i++) {
-                       ret = smu_v13_0_5_get_dpm_freq_by_index(smu, clk_type, i, &value);
+                       idx = (clk_type == SMU_MCLK) ? (count - i - 1) : i;
+                       ret = smu_v13_0_5_get_dpm_freq_by_index(smu, clk_type, idx, &value);
                        if (ret)
                                goto print_clk_out;