This is a note to let you know that I've just added the patch titled
drm/amd/display: Support parsing VRAM info v3.0 from VBIOS
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-support-parsing-vram-info-v3.0-from-vbios.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7e952a18eb978a3e51fc1704b752378be66226b2 Mon Sep 17 00:00:00 2001
From: George Shen <george.shen@xxxxxxx>
Date: Wed, 2 Nov 2022 15:06:48 -0400
Subject: drm/amd/display: Support parsing VRAM info v3.0 from VBIOS
From: George Shen <george.shen@xxxxxxx>
commit 7e952a18eb978a3e51fc1704b752378be66226b2 upstream.
[Why]
For DCN3.2 and DCN3.21, VBIOS has switch to using v3.0 of the VRAM
info struct. We should read and override the VRAM info in driver with
values provided by VBIOS to support memory downbin cases.
Reviewed-by: Alvin Lee <Alvin.Lee2@xxxxxxx>
Acked-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: George Shen <george.shen@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 6.0.x
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c | 30 +++++++++++++++++++++
1 file changed, 30 insertions(+)
--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
@@ -2392,6 +2392,26 @@ static enum bp_result get_vram_info_v25(
return result;
}
+static enum bp_result get_vram_info_v30(
+ struct bios_parser *bp,
+ struct dc_vram_info *info)
+{
+ struct atom_vram_info_header_v3_0 *info_v30;
+ enum bp_result result = BP_RESULT_OK;
+
+ info_v30 = GET_IMAGE(struct atom_vram_info_header_v3_0,
+ DATA_TABLES(vram_info));
+
+ if (info_v30 == NULL)
+ return BP_RESULT_BADBIOSTABLE;
+
+ info->num_chans = info_v30->channel_num;
+ info->dram_channel_width_bytes = (1 << info_v30->channel_width) / 8;
+
+ return result;
+}
+
+
/*
* get_integrated_info_v11
*
@@ -3022,6 +3042,16 @@ static enum bp_result bios_parser_get_vr
break;
default:
break;
+ }
+ break;
+
+ case 3:
+ switch (revision.minor) {
+ case 0:
+ result = get_vram_info_v30(bp, info);
+ break;
+ default:
+ break;
}
break;
Patches currently in stable-queue which might be from george.shen@xxxxxxx are
queue-6.0/drm-amd-display-round-up-dst_after_scaler-to-nearest.patch
queue-6.0/drm-amd-display-fix-dcn32-dsc-delay-calculation.patch
queue-6.0/drm-amd-display-support-parsing-vram-info-v3.0-from-vbios.patch
queue-6.0/drm-amd-display-use-forced-dsc-bpp-in-dml.patch
