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drm/dp_mst: Store the MST PBN divider value in fixed point format

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On UHBR links the PBN divider is a fractional number, accordingly store
it in fixed point format. For now drm_dp_get_vc_payload_bw() always
returns a whole number and all callers will use only the integer part of
it which should preserve the current behavior. The next patch will fix
drm_dp_get_vc_payload_bw() for UHBR rates returning a fractional number
for those (also accounting for the channel coding efficiency correctly).

Cc: Lyude Paul <lyude@redhat.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Wayne Lin <wayne.lin@amd.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[Rebased changes in dm_helpers_construct_old_payload() on drm-intel-next]
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231116131841.1588781-2-imre.deak@intel.com
This commit is contained in:
Imre Deak
2023-11-16 15:18:31 +02:00
parent f1dfb517cc
commit 191dc43935
7 changed files with 34 additions and 18 deletions
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5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -85,6 +85,7 @@
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_fixed.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_edid.h>
#include <drm/drm_vblank.h>
@@ -6863,8 +6864,8 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
if (IS_ERR(mst_state))
return PTR_ERR(mst_state);
if (!mst_state->pbn_div)
mst_state->pbn_div = dm_mst_get_pbn_divider(aconnector->mst_root->dc_link);
if (!mst_state->pbn_div.full)
mst_state->pbn_div.full = dfixed_const(dm_mst_get_pbn_divider(aconnector->mst_root->dc_link));
if (!state->duplicated) {
int max_bpc = conn_state->max_requested_bpc;