[AMD Official Use Only]
Reviewed-by: Huang Rui <ray.huang@xxxxxxx>
-----Original Message-----
From: Liu, Aaron <Aaron.Liu@xxxxxxx>
Sent: Tuesday, May 18, 2021 10:16 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Huang, Ray <Ray.Huang@xxxxxxx>; Wang, Kevin(Yang) <Kevin1.Wang@xxxxxxx>; Liu, Aaron <Aaron.Liu@xxxxxxx>
Subject: [PATCH] drm/amdgpu: modify system reference clock source for navi+ (V2)
Starting from Navi+, the rlc reference clock is used for system clock from vbios gfx_info table. It is incorrect to use core_refclk_10khz of vbios smu_info table as system clock.
Signed-off-by: Aaron Liu <aaron.liu@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
index 8c417014ca89..3b5d13189073 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
@@ -546,6 +546,21 @@ int amdgpu_atomfirmware_get_clock_info(struct amdgpu_device *adev)
ret = 0;
}
+ /* if asic is Navi+, the rlc reference clock is used for system clock
+ * from vbios gfx_info table */
+ if (adev->asic_type >= CHIP_NAVI10) {
+ index = get_index_into_master_table(atom_master_list_of_data_tables_v2_1,
+ gfx_info);
+ if (amdgpu_atom_parse_data_header(mode_info->atom_context, index, NULL,
+ &frev, &crev, &data_offset)) {
+ struct atom_gfx_info_v2_2 *gfx_info = (struct atom_gfx_info_v2_2*)
+ (mode_info->atom_context->bios + data_offset);
+ if ((frev == 2) && (crev >= 2))
+ spll->reference_freq = le32_to_cpu(gfx_info->rlc_gpu_timer_refclk);
+ ret = 0;
+ }
+ }
+
return ret;
}
--
2.25.1
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