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drm/i915/psr: Read Intel DPCD workaround register

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Read Intel DPCD workaround register and store it into
intel_connector->dp.psr_caps. psr_caps was chosen as currently it contains
only PSR workaround for PSR2 SDP on prior scanline implementation.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260515095756.2799483-3-jouni.hogander@intel.com
(cherry picked from commit c48ff24d0f4ab7ad696b2d35ad64ce7e049c668c)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
This commit is contained in:
Jouni Högander 2026-05-15 12:57:54 +03:00 committed by Tvrtko Ursulin
parent fbceb39b53
commit f30bece421
2 changed files with 9 additions and 1 deletions
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1
drivers/gpu/drm/i915/display/intel_display_types.h
View File

@ -584,6 +584,7 @@ struct intel_connector {
struct {
u8 dpcd[EDP_PSR_RECEIVER_CAP_SIZE];
u8 intel_wa_dpcd;
bool support;
bool su_support;

9
drivers/gpu/drm/i915/display/intel_psr.c
View File

@ -43,6 +43,7 @@
#include "intel_display_wa.h"
#include "intel_dmc.h"
#include "intel_dp.h"
#include "intel_dpcd.h"
#include "intel_dp_aux.h"
#include "intel_dsb.h"
#include "intel_frontbuffer.h"
@ -716,8 +717,14 @@ static void _psr_init_dpcd(struct intel_dp *intel_dp, struct intel_connector *co
connector->dp.psr_caps.su_support ? "" : "not ");
}
if (connector->dp.psr_caps.su_support)
if (connector->dp.psr_caps.su_support) {
ret = drm_dp_dpcd_read_byte(&intel_dp->aux,
INTEL_DPCD_INTEL_WA_REGISTER_CAPS,
&connector->dp.psr_caps.intel_wa_dpcd);
if (ret < 0)
return;
_psr_compute_su_granularity(intel_dp, connector);
}
}
void intel_psr_init_dpcd(struct intel_dp *intel_dp, struct intel_connector *connector)