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From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Alex Deucher <alexander.deucher@amd.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>,
	dri-devel@lists.freedesktop.org, Ben Skeggs <bskeggs@redhat.com>
Subject: [PATCH v2 3/9] drm/dp: Split drm_dp_mst_allocate_vcpi
Date: Tue, 24 Jan 2017 15:49:31 -0800	[thread overview]
Message-ID: <1485301777-3465-4-git-send-email-dhinakaran.pandiyan@intel.com> (raw)
In-Reply-To: <1485301777-3465-1-git-send-email-dhinakaran.pandiyan@intel.com>

drm_dp_mst_allocate_vcpi() apart from setting up the vcpi structure,
also finds if there are enough slots available. This check is a duplicate
of that implemented in drm_dp_mst_find_vcpi_slots(). Let's move this check
out and reuse the existing drm_dp_mst_find_vcpi_slots() function to check
if there are enough vcpi slots before allocating them.

This brings the check to one place. Additionally drivers that will use MST
state tracking for atomic modesets can use the atomic version of
find_vcpi_slots() and reuse drm_dp_mst_allocate_vcpi()

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c  | 20 +++++++++-----------
 drivers/gpu/drm/i915/intel_dp_mst.c    |  4 ++--
 drivers/gpu/drm/nouveau/nv50_display.c |  3 ++-
 drivers/gpu/drm/radeon/radeon_dp_mst.c |  4 +++-
 include/drm/drm_dp_mst_helper.h        |  2 +-
 5 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index d9edd84..b871d4e 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2479,20 +2479,17 @@ int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
 EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
 
 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
-			    struct drm_dp_vcpi *vcpi, int pbn)
+			    struct drm_dp_vcpi *vcpi, int pbn, int slots)
 {
-	int num_slots;
 	int ret;
 
-	num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
-
 	/* max. time slots - one slot for MTP header */
-	if (num_slots > 63)
+	if (slots > 63)
 		return -ENOSPC;
 
 	vcpi->pbn = pbn;
-	vcpi->aligned_pbn = num_slots * mgr->pbn_div;
-	vcpi->num_slots = num_slots;
+	vcpi->aligned_pbn = slots * mgr->pbn_div;
+	vcpi->num_slots = slots;
 
 	ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
 	if (ret < 0)
@@ -2507,7 +2504,7 @@ static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
  * @pbn: payload bandwidth number to request
  * @slots: returned number of slots for this PBN.
  */
-bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots)
+bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int slots)
 {
 	int ret;
 
@@ -2515,16 +2512,18 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp
 	if (!port)
 		return false;
 
+	if (slots < 0)
+		return false;
+
 	if (port->vcpi.vcpi > 0) {
 		DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn);
 		if (pbn == port->vcpi.pbn) {
-			*slots = port->vcpi.num_slots;
 			drm_dp_put_port(port);
 			return true;
 		}
 	}
 
-	ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn);
+	ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
 	if (ret) {
 		DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
 				DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
@@ -2532,7 +2531,6 @@ bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp
 	}
 	DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
 			pbn, port->vcpi.num_slots);
-	*slots = port->vcpi.num_slots;
 
 	drm_dp_put_port(port);
 	return true;
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 38e3ca2..f51574f 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -147,7 +147,6 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 		to_intel_connector(conn_state->connector);
 	int ret;
 	uint32_t temp;
-	int slots;
 
 	/* MST encoders are bound to a crtc, not to a connector,
 	 * force the mapping here for get_hw_state.
@@ -177,7 +176,8 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
 
 	ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
 				       connector->port,
-				       pipe_config->pbn, &slots);
+				       pipe_config->pbn,
+				       pipe_config->dp_m_n.tu);
 	if (ret == false) {
 		DRM_ERROR("failed to allocate vcpi\n");
 		return;
diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index 452da48..91a4875 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -2959,7 +2959,8 @@ nv50_msto_enable(struct drm_encoder *encoder)
 	if (WARN_ON(!mstc))
 		return;
 
-	r = drm_dp_mst_allocate_vcpi(&mstm->mgr, mstc->port, mstc->pbn, &slots);
+	slots = drm_dp_find_vcpi_slots(&mstm->mgr, mstc->pbn);
+	r = drm_dp_mst_allocate_vcpi(&mstm->mgr, mstc->port, mstc->pbn, slots);
 	WARN_ON(!r);
 
 	if (mstm->outp->dcb->sorconf.link & 1)
diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
index 7d5ada3..6598306 100644
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -453,9 +453,11 @@ radeon_mst_encoder_dpms(struct drm_encoder *encoder, int mode)
 		DRM_DEBUG_KMS("dig encoder is %d %d %d\n", dig_enc->dig_encoder,
 			      dig_enc->linkb, radeon_crtc->crtc_id);
 
+		slots = drm_dp_find_vcpi_slots(&radeon_connector->mst_port->mst_mgr,
+					       mst_enc->pbn);
 		ret = drm_dp_mst_allocate_vcpi(&radeon_connector->mst_port->mst_mgr,
 					       radeon_connector->port,
-					       mst_enc->pbn, &slots);
+					       mst_enc->pbn, slots);
 		ret = drm_dp_update_payload_part1(&radeon_connector->mst_port->mst_mgr);
 
 		radeon_dp_mst_set_be_cntl(primary, mst_enc,
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index b0f4a09..98d3c73 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -568,7 +568,7 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_
 int drm_dp_calc_pbn_mode(int clock, int bpp);
 
 
-bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
+bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int slots);
 
 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 
-- 
2.7.4

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  parent reply	other threads:[~2017-01-24 23:49 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-24 23:49 [PATCH v2 0/9] Adding private objects to atomic state Dhinakaran Pandiyan
2017-01-24 23:49 ` [PATCH v2 1/9] drm/dp: Store drm_device in MST topology manager Dhinakaran Pandiyan
2017-01-25  0:30   ` [Intel-gfx] " Dave Airlie
2017-01-24 23:49 ` [PATCH v2 2/9] drm/dp: Kill unused MST vcpi slot availability tracking Dhinakaran Pandiyan
2017-01-25  5:43   ` Daniel Vetter
2017-01-25 20:36     ` Pandiyan, Dhinakaran
2017-01-24 23:49 ` Dhinakaran Pandiyan [this message]
2017-01-25  0:31   ` [PATCH v2 3/9] drm/dp: Split drm_dp_mst_allocate_vcpi Dave Airlie
2017-01-25 20:34     ` Pandiyan, Dhinakaran
2017-01-24 23:49 ` [PATCH v2 4/9] drm: Add driver private objects to atomic state Dhinakaran Pandiyan
2017-01-25  5:59   ` Daniel Vetter
2017-01-25 20:47     ` Pandiyan, Dhinakaran
2017-01-26  8:38       ` [Intel-gfx] " Daniel Vetter
2017-01-25 21:33     ` Harry Wentland
2017-01-26  8:40       ` Daniel Vetter
2017-01-24 23:49 ` [PATCH v2 5/9] drm/dp: Introduce MST topology state Dhinakaran Pandiyan
2017-01-25  6:05   ` Daniel Vetter
2017-01-24 23:49 ` [PATCH v2 6/9] drm/dp: Add DP MST helpers to atomically find and release vcpi slots Dhinakaran Pandiyan
2017-01-24 23:49 ` [PATCH v2 7/9] drm: Connector helper function to release atomic state Dhinakaran Pandiyan
2017-01-25  6:18   ` Daniel Vetter
2017-01-25 21:01     ` Pandiyan, Dhinakaran
2017-01-31  0:14     ` Pandiyan, Dhinakaran
2017-01-24 23:49 ` [PATCH v2 8/9] drm/dp: Release DP MST shared link bandwidth Dhinakaran Pandiyan
2017-01-25  6:16   ` Daniel Vetter
2017-01-25 20:53     ` Pandiyan, Dhinakaran
2017-01-26  8:41       ` [Intel-gfx] " Daniel Vetter
2017-01-24 23:49 ` [PATCH v2 9/9] drm/dp: Track MST " Dhinakaran Pandiyan
2017-01-25  6:15   ` Daniel Vetter
2017-01-25 21:00     ` Pandiyan, Dhinakaran
2017-01-26  8:42       ` [Intel-gfx] " Daniel Vetter

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