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drm/dp: Introduce MST topology state to track available link bandwidth

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Link bandwidth is shared between multiple display streams in DP MST
configurations. The DP MST topology manager structure maintains the
shared link bandwidth for a primary link directly connected to the GPU. For
atomic modesetting drivers, checking if there is sufficient link bandwidth
for a mode needs to be done during the atomic_check phase to avoid failed
modesets. Let's encapsulate the available link bw information in a
private state structure so that bw can be allocated and released atomically
for each of the ports sharing the primary link.

v3: WARN_ON() if connection_mutex is not held (Archit)
v2: Included kernel doc, moved state initialization and switched to
kmemdup() for allocation (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Harry Wentland <Harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1492753893-3748-3-git-send-email-dhinakaran.pandiyan@intel.com
This commit is contained in:
Pandiyan, Dhinakaran
2017-04-20 22:51:31 -07:00
committed by Maarten Lankhorst
parent b430c27a7d
commit 3f3353b7e1
2 changed files with 95 additions and 0 deletions
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20
include/drm/drm_dp_mst_helper.h
View File

@@ -24,6 +24,7 @@
#include <linux/types.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_atomic.h>
struct drm_dp_mst_branch;
@@ -403,6 +404,12 @@ struct drm_dp_payload {
int vcpi;
};
struct drm_dp_mst_topology_state {
int avail_slots;
struct drm_atomic_state *state;
struct drm_dp_mst_topology_mgr *mgr;
};
/**
* struct drm_dp_mst_topology_mgr - DisplayPort MST manager
*
@@ -480,6 +487,16 @@ struct drm_dp_mst_topology_mgr {
*/
int pbn_div;
/**
* @state: State information for topology manager
*/
struct drm_dp_mst_topology_state *state;
/**
* @funcs: Atomic helper callbacks
*/
const struct drm_private_state_funcs *funcs;
/**
* @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
* &drm_dp_sideband_msg_tx.state once they are queued
@@ -596,4 +613,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr);
#endif