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| author | Imre Deak <imre.deak@intel.com> | 2023-11-16 15:18:31 +0200 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2023-11-21 16:31:58 +0200 |
| commit | 191dc43935d1ece82bc6c9653463b3b1cd8198fb (patch) | |
| tree | b17564c519ce4be7a7b06e0d7320c3df377c68b2 /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | |
| parent | drm/i915/fbc: Bump ivb FBC max surface size to 4kx4k (diff) | |
| download | linux-191dc43935d1ece82bc6c9653463b3b1cd8198fb.tar.gz linux-191dc43935d1ece82bc6c9653463b3b1cd8198fb.zip | |
drm/dp_mst: Store the MST PBN divider value in fixed point format
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
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c index baf7e5254fb3..53e323b71d26 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c @@ -31,6 +31,7 @@ #include <drm/drm_probe_helper.h> #include <drm/amdgpu_drm.h> #include <drm/drm_edid.h> +#include <drm/drm_fixed.h> #include "dm_services.h" #include "amdgpu.h" @@ -205,13 +206,14 @@ void dm_helpers_dp_update_branch_info( static void dm_helpers_construct_old_payload( struct dc_link *link, - int pbn_per_slot, + fixed20_12 pbn_per_slot_fp, struct drm_dp_mst_atomic_payload *new_payload, struct drm_dp_mst_atomic_payload *old_payload) { struct link_mst_stream_allocation_table current_link_table = link->mst_stream_alloc_table; struct link_mst_stream_allocation *dc_alloc; + int pbn_per_slot = dfixed_trunc(pbn_per_slot_fp); int i; *old_payload = *new_payload; |