diff options
| 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 /include/drm | |
| parent | f1dfb517cc5731b10aab3309629bfe80596a0d49 (diff) | |
| download | linux-191dc43935d1ece82bc6c9653463b3b1cd8198fb.tar.gz | |
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 'include/drm')
| -rw-r--r-- | include/drm/display/drm_dp_mst_helper.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h index a4aad6df71f18..9b19d8bd520af 100644 --- a/include/drm/display/drm_dp_mst_helper.h +++ b/include/drm/display/drm_dp_mst_helper.h @@ -25,6 +25,7 @@ #include <linux/types.h> #include <drm/display/drm_dp_helper.h> #include <drm/drm_atomic.h> +#include <drm/drm_fixed.h> #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) #include <linux/stackdepot.h> @@ -617,7 +618,7 @@ struct drm_dp_mst_topology_state { * @pbn_div: The current PBN divisor for this topology. The driver is expected to fill this * out itself. */ - int pbn_div; + fixed20_12 pbn_div; }; #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base) @@ -839,8 +840,8 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); -int drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr, - int link_rate, int link_lane_count); +fixed20_12 drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr, + int link_rate, int link_lane_count); int drm_dp_calc_pbn_mode(int clock, int bpp); |