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drm/amd/display: increase max link count and fix link->enc NULL pointer access

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commit bec947cbe9 upstream.

[why]
1.) dc->links[MAX_LINKS] array size smaller than actual requested.
max_connector + max_dpia + 4 virtual = 14.
increase from 12 to 14.

2.) hw_init() access null LINK_ENC for dpia non display_endpoint.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Reviewed-by: Chris Park <chris.park@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit d7f5a61e1b04ed87b008c8d327649d184dc5bb45)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Charlene Liu
2025-09-29 20:29:30 -04:00
committed by Greg Kroah-Hartman
parent 6fc0a7c99e
commit f28092be4e
2 changed files with 10 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
View File

@@ -287,6 +287,9 @@ void dcn401_init_hw(struct dc *dc)
*/
struct dc_link *link = dc->links[i];
if (link->ep_type != DISPLAY_ENDPOINT_PHY)
continue;
link->link_enc->funcs->hw_init(link->link_enc);
/* Check for enabled DIG to identify enabled display */

8
drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h
View File

@@ -44,7 +44,13 @@
*/
#define MAX_PIPES 6
#define MAX_PHANTOM_PIPES (MAX_PIPES / 2)
#define MAX_LINKS (MAX_PIPES * 2 +2)
#define MAX_DPIA 6
#define MAX_CONNECTOR 6
#define MAX_VIRTUAL_LINKS 4
#define MAX_LINKS (MAX_DPIA + MAX_CONNECTOR + MAX_VIRTUAL_LINKS)
#define MAX_DIG_LINK_ENCODERS 7
#define MAX_DWB_PIPES 1
#define MAX_HPO_DP2_ENCODERS 4