drm/amdgpu/vpe: fix vpe dpm clk ratio setup failed

Some version of BIOS does not enable all clock levels,
resulting in high level clock frequency of 0.
The number of valid CLKs must be confirmed in advance.
Signed-off-by: Peyton Lee <peytolee@amd.com>
Reviewed-by: Lang Yu <lang.yu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.c

@@ -128,6 +128,7 @@ int amdgpu_vpe_configure_dpm(struct amdgpu_vpe *vpe)
 		struct dpm_clock *VPEClks;
 		struct dpm_clock *SOCClks;
 		uint32_t idx;
+		uint32_t vpeclk_enalbled_num = 0;
 		uint32_t pratio_vmax_vnorm = 0, pratio_vnorm_vmid = 0, pratio_vmid_vmin = 0;
 		uint16_t pratio_vmin_freq = 0, pratio_vmid_freq = 0, pratio_vnorm_freq = 0, pratio_vmax_freq = 0;
 
@@ -144,6 +145,14 @@ int amdgpu_vpe_configure_dpm(struct amdgpu_vpe *vpe)
 		SOCClks = clock_table.SocClocks;
 		VPEClks = clock_table.VPEClocks;
 
+		/* Comfirm enabled vpe clk num
+		 * Enabled VPE clocks are ordered from low to high in VPEClks
+		 * The highest valid clock index+1 is the number of VPEClks
+		 */
+		for (idx = PP_SMU_NUM_VPECLK_DPM_LEVELS; idx && !vpeclk_enalbled_num; idx--)
+			if (VPEClks[idx-1].Freq)
+				vpeclk_enalbled_num = idx;
+
 		/* vpe dpm only cares 4 levels. */
 		for (idx = 0; idx < VPE_MAX_DPM_LEVEL; idx++) {
 			uint32_t soc_dpm_level;
@@ -155,8 +164,8 @@ int amdgpu_vpe_configure_dpm(struct amdgpu_vpe *vpe)
 				soc_dpm_level = (idx * 2) + 1;
 
 			/* clamp the max level */
-			if (soc_dpm_level > PP_SMU_NUM_VPECLK_DPM_LEVELS - 1)
-				soc_dpm_level = PP_SMU_NUM_VPECLK_DPM_LEVELS - 1;
+			if (soc_dpm_level > vpeclk_enalbled_num - 1)
+				soc_dpm_level = vpeclk_enalbled_num - 1;
 
 			min_freq = (SOCClks[soc_dpm_level].Freq < VPEClks[soc_dpm_level].Freq) ?
 				   SOCClks[soc_dpm_level].Freq : VPEClks[soc_dpm_level].Freq;