[PATCH v14 00/14] Add PSR support for eDP

[PATCH v14 00/14] Add PSR support for eDP

[Vinod Polimera]

Changes in v2:
  - Use dp bridge to set psr entry/exit instead of dpu_enocder.
  - Don't modify whitespaces.
  - Set self refresh aware from atomic_check.
  - Set self refresh aware only if psr is supported.
  - Provide a stub for msm_dp_display_set_psr.
  - Move dp functions to bridge code.

Changes in v3:
  - Change callback names to reflect atomic interfaces.
  - Move bridge callback change to separate patch as suggested by Dmitry.
  - Remove psr function declaration from msm_drv.h.
  - Set self_refresh_aware flag only if psr is supported.
  - Modify the variable names to simpler form.
  - Define bit fields for PSR settings.
  - Add comments explaining the steps to enter/exit psr.
  - Change DRM_INFO to drm_dbg_db. 

Changes in v4:
  - Move the get crtc functions to drm_atomic.
  - Add atomic functions for DP bridge too.
  - Add ternary operator to choose eDP or DP ops.
  - Return true/false instead of 1/0.
  - mode_valid missing in the eDP bridge ops.
  - Move the functions to get crtc into drm_atomic.c.
  - Fix compilation issues.
  - Remove dpu_assign_crtc and get crtc from drm_enc instead of dpu_enc.
  - Check for crtc state enable while reserving resources.

Changes in v5:
  - Move the mode_valid changes into a different patch.
  - Complete psr_op_comp only when isr is set.
  - Move the DP atomic callback changes to a different patch.
  - Get crtc from drm connector state crtc.
  - Move to separate patch for check for crtc state enable while
reserving resources.

Changes in v6:
  - Remove crtc from dpu_encoder_virt struct.
  - fix crtc check during vblank toggle crtc.
  - Misc changes. 

Changes in v7:
  - Add fix for underrun issue on kasan build.

Changes in v8:
  - Drop the enc spinlock as it won't serve any purpose in
protetcing conn state.(Dmitry/Doug)

Changes in v9:
  - Update commit message and fix alignment using spaces.(Marijn)
  - Misc changes.(Marijn)

Changes in v10:
  - Get crtc cached in dpu_enc during obj init.(Dmitry)

Changes in v11:
  - Remove crtc cached in dpu_enc during obj init.
  - Update dpu_enc crtc state on crtc enable/disable during self refresh.

Changes in v12:
  - Update sc7180 intf mask to get intf timing gen status
based on DPU_INTF_STATUS_SUPPORTED bit.(Dmitry)
  - Remove "clear active interface in the datapath cleanup" change
as it is already included.

Changes in v13:
  - Move core changes to top of the series.(Dmitry)
  - Drop self refresh aware disable change after psr entry.(Dmitry)

Changes in v14:
  - Set self_refresh_aware for the PSR to kick in.

Vinod Polimera (14):
  drm: add helper functions to retrieve old and new crtc
  drm/bridge: use atomic enable/disable callbacks for panel bridge
  drm/bridge: add psr support for panel bridge callbacks
  drm/msm/disp/dpu: check for crtc enable rather than crtc active to
    release shared resources
  drm/msm/disp/dpu: get timing engine status from intf status register
  drm/msm/disp/dpu: wait for extra vsync till timing engine status is
    disabled
  drm/msm/disp/dpu: reset the datapath after timing engine disable
  drm/msm/dp: use atomic callbacks for DP bridge ops
  drm/msm/dp: Add basic PSR support for eDP
  drm/msm/dp: use the eDP bridge ops to validate eDP modes
  drm/msm/disp/dpu: use atomic enable/disable callbacks for encoder
    functions
  drm/msm/disp/dpu: add PSR support for eDP interface in dpu driver
  drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable
    during self refresh
  drm/msm/dp: set self refresh aware based on psr support

 drivers/gpu/drm/bridge/panel.c                     |  68 +++++++-
 drivers/gpu/drm/drm_atomic.c                       |  60 +++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c           |  40 ++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        |  26 +++-
 .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   |  22 +++
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c     |   3 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h     |  12 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        |   8 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c            |   2 +-
 drivers/gpu/drm/msm/dp/dp_catalog.c                |  80 ++++++++++
 drivers/gpu/drm/msm/dp/dp_catalog.h                |   4 +
 drivers/gpu/drm/msm/dp/dp_ctrl.c                   |  80 ++++++++++
 drivers/gpu/drm/msm/dp/dp_ctrl.h                   |   3 +
 drivers/gpu/drm/msm/dp/dp_display.c                |  36 +++--
 drivers/gpu/drm/msm/dp/dp_display.h                |   2 +
 drivers/gpu/drm/msm/dp/dp_drm.c                    | 173 ++++++++++++++++++++-
 drivers/gpu/drm/msm/dp/dp_drm.h                    |   9 +-
 drivers/gpu/drm/msm/dp/dp_link.c                   |  36 +++++
 drivers/gpu/drm/msm/dp/dp_panel.c                  |  22 +++
 drivers/gpu/drm/msm/dp/dp_panel.h                  |   6 +
 drivers/gpu/drm/msm/dp/dp_reg.h                    |  27 ++++
 include/drm/drm_atomic.h                           |   7 +
 22 files changed, 683 insertions(+), 43 deletions(-)

-- 
2.7.4

[PATCH v14 01/14] drm: add helper functions to retrieve old and new crtc

[Vinod Polimera]

Add new helper functions, drm_atomic_get_old_crtc_for_encoder
and drm_atomic_get_new_crtc_for_encoder to retrieve the
corresponding crtc for the encoder.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/drm_atomic.c | 60 ++++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_atomic.h     |  7 ++++++
 2 files changed, 67 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 5457c02..7cc39f6 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -985,6 +985,66 @@ drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state *state,
 EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder);
 
 /**
+ * drm_atomic_get_old_crtc_for_encoder - Get old crtc for an encoder
+ * @state: Atomic state
+ * @encoder: The encoder to fetch the crtc state for
+ *
+ * This function finds and returns the crtc that was connected to @encoder
+ * as specified by the @state.
+ *
+ * Returns: The old crtc connected to @encoder, or NULL if the encoder is
+ * not connected.
+ */
+struct drm_crtc *
+drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state *state,
+				    struct drm_encoder *encoder)
+{
+	struct drm_connector *connector;
+	struct drm_connector_state *conn_state;
+
+	connector = drm_atomic_get_old_connector_for_encoder(state, encoder);
+	if (!connector)
+		return NULL;
+
+	conn_state = drm_atomic_get_old_connector_state(state, connector);
+	if (!conn_state)
+		return NULL;
+
+	return conn_state->crtc;
+}
+EXPORT_SYMBOL(drm_atomic_get_old_crtc_for_encoder);
+
+/**
+ * drm_atomic_get_new_crtc_for_encoder - Get new crtc for an encoder
+ * @state: Atomic state
+ * @encoder: The encoder to fetch the crtc state for
+ *
+ * This function finds and returns the crtc that will be connected to @encoder
+ * as specified by the @state.
+ *
+ * Returns: The new crtc connected to @encoder, or NULL if the encoder is
+ * not connected.
+ */
+struct drm_crtc *
+drm_atomic_get_new_crtc_for_encoder(struct drm_atomic_state *state,
+				    struct drm_encoder *encoder)
+{
+	struct drm_connector *connector;
+	struct drm_connector_state *conn_state;
+
+	connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
+	if (!connector)
+		return NULL;
+
+	conn_state = drm_atomic_get_new_connector_state(state, connector);
+	if (!conn_state)
+		return NULL;
+
+	return conn_state->crtc;
+}
+EXPORT_SYMBOL(drm_atomic_get_new_crtc_for_encoder);
+
+/**
  * drm_atomic_get_connector_state - get connector state
  * @state: global atomic state object
  * @connector: connector to get state object for
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 92586ab..9a022ca 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -528,6 +528,13 @@ struct drm_connector *
 drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state *state,
 					 struct drm_encoder *encoder);
 
+struct drm_crtc *
+drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state *state,
+					 struct drm_encoder *encoder);
+struct drm_crtc *
+drm_atomic_get_new_crtc_for_encoder(struct drm_atomic_state *state,
+					 struct drm_encoder *encoder);
+
 /**
  * drm_atomic_get_existing_crtc_state - get CRTC state, if it exists
  * @state: global atomic state object
-- 
2.7.4

[PATCH v14 02/14] drm/bridge: use atomic enable/disable callbacks for panel bridge

[Vinod Polimera]

Use atomic variants for panel bridge callback functions such that
certain states like self-refresh can be accessed as part of
enable/disable sequence.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/bridge/panel.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index e8aae3c..04e9fb0 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -109,28 +109,32 @@ static void panel_bridge_detach(struct drm_bridge *bridge)
 		drm_connector_cleanup(connector);
 }
 
-static void panel_bridge_pre_enable(struct drm_bridge *bridge)
+static void panel_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
 
 	drm_panel_prepare(panel_bridge->panel);
 }
 
-static void panel_bridge_enable(struct drm_bridge *bridge)
+static void panel_bridge_atomic_enable(struct drm_bridge *bridge,
+				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
 
 	drm_panel_enable(panel_bridge->panel);
 }
 
-static void panel_bridge_disable(struct drm_bridge *bridge)
+static void panel_bridge_atomic_disable(struct drm_bridge *bridge,
+				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
 
 	drm_panel_disable(panel_bridge->panel);
 }
 
-static void panel_bridge_post_disable(struct drm_bridge *bridge)
+static void panel_bridge_atomic_post_disable(struct drm_bridge *bridge,
+				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
 
@@ -159,10 +163,10 @@ static void panel_bridge_debugfs_init(struct drm_bridge *bridge,
 static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
 	.attach = panel_bridge_attach,
 	.detach = panel_bridge_detach,
-	.pre_enable = panel_bridge_pre_enable,
-	.enable = panel_bridge_enable,
-	.disable = panel_bridge_disable,
-	.post_disable = panel_bridge_post_disable,
+	.atomic_pre_enable = panel_bridge_atomic_pre_enable,
+	.atomic_enable = panel_bridge_atomic_enable,
+	.atomic_disable = panel_bridge_atomic_disable,
+	.atomic_post_disable = panel_bridge_atomic_post_disable,
 	.get_modes = panel_bridge_get_modes,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
-- 
2.7.4

[PATCH v14 03/14] drm/bridge: add psr support for panel bridge callbacks

[Vinod Polimera]

This change will handle the psr entry exit cases in the panel
bridge atomic callback functions. For example, the panel power
should not turn off if the panel is entering psr.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/bridge/panel.c | 48 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 04e9fb0..a2c6f30 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -113,6 +113,18 @@ static void panel_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_crtc_state;
+
+	crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
+	if (old_crtc_state && old_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_prepare(panel_bridge->panel);
 }
@@ -121,6 +133,18 @@ static void panel_bridge_atomic_enable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_crtc_state;
+
+	crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
+	if (old_crtc_state && old_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_enable(panel_bridge->panel);
 }
@@ -129,6 +153,18 @@ static void panel_bridge_atomic_disable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state;
+
+	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
+	if (new_crtc_state && new_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_disable(panel_bridge->panel);
 }
@@ -137,6 +173,18 @@ static void panel_bridge_atomic_post_disable(struct drm_bridge *bridge,
 				struct drm_bridge_state *old_bridge_state)
 {
 	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_encoder *encoder = bridge->encoder;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state;
+
+	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
+	if (!crtc)
+		return;
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
+	if (new_crtc_state && new_crtc_state->self_refresh_active)
+		return;
 
 	drm_panel_unprepare(panel_bridge->panel);
 }
-- 
2.7.4

[PATCH v14 04/14] drm/msm/disp/dpu: check for crtc enable rather than crtc active to release shared resources

[Vinod Polimera]

According to KMS documentation, The driver must not release any shared
resources if active is set to false but enable still true.

Fixes: ccc862b957c6 ("drm/msm/dpu: Fix reservation failures in modeset")
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 758261e..c237003 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -652,7 +652,7 @@ static int dpu_encoder_virt_atomic_check(
 		if (drm_atomic_crtc_needs_modeset(crtc_state)) {
 			dpu_rm_release(global_state, drm_enc);
 
-			if (!crtc_state->active_changed || crtc_state->active)
+			if (!crtc_state->active_changed || crtc_state->enable)
 				ret = dpu_rm_reserve(&dpu_kms->rm, global_state,
 						drm_enc, crtc_state, topology);
 		}
-- 
2.7.4

[PATCH v14 05/14] drm/msm/disp/dpu: get timing engine status from intf status register

[Vinod Polimera]

Recommended way of reading the interface timing gen status is via
status register. Timing gen status register will give a reliable status
of the interface especially during ON/OFF transitions. This support was
added from DPU version 5.0.0.

Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c |  3 ++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 12 +++++++-----
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c    |  8 +++++++-
 3 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
index cf053e8..85b29d6 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
@@ -78,7 +78,8 @@
 
 #define INTF_SDM845_MASK (0)
 
-#define INTF_SC7180_MASK BIT(DPU_INTF_INPUT_CTRL) | BIT(DPU_INTF_TE)
+#define INTF_SC7180_MASK \
+	(BIT(DPU_INTF_INPUT_CTRL) | BIT(DPU_INTF_TE) | BIT(DPU_INTF_STATUS_SUPPORTED))
 
 #define INTF_SC7280_MASK INTF_SC7180_MASK | BIT(DPU_DATA_HCTL_EN)
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index ddab9ca..08cd1a1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -213,17 +213,19 @@ enum {
 
 /**
  * INTF sub-blocks
- * @DPU_INTF_INPUT_CTRL         Supports the setting of pp block from which
- *                              pixel data arrives to this INTF
- * @DPU_INTF_TE                 INTF block has TE configuration support
- * @DPU_DATA_HCTL_EN            Allows data to be transferred at different rate
-                                than video timing
+ * @DPU_INTF_INPUT_CTRL             Supports the setting of pp block from which
+ *                                  pixel data arrives to this INTF
+ * @DPU_INTF_TE                     INTF block has TE configuration support
+ * @DPU_DATA_HCTL_EN                Allows data to be transferred at different rate
+ *                                  than video timing
+ * @DPU_INTF_STATUS_SUPPORTED       INTF block has INTF_STATUS register
  * @DPU_INTF_MAX
  */
 enum {
 	DPU_INTF_INPUT_CTRL = 0x1,
 	DPU_INTF_TE,
 	DPU_DATA_HCTL_EN,
+	DPU_INTF_STATUS_SUPPORTED,
 	DPU_INTF_MAX
 };
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
index 7ce66bf..84ee2ef 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
@@ -62,6 +62,7 @@
 #define   INTF_LINE_COUNT               0x0B0
 
 #define   INTF_MUX                      0x25C
+#define   INTF_STATUS                   0x26C
 
 #define INTF_CFG_ACTIVE_H_EN	BIT(29)
 #define INTF_CFG_ACTIVE_V_EN	BIT(30)
@@ -297,8 +298,13 @@ static void dpu_hw_intf_get_status(
 		struct intf_status *s)
 {
 	struct dpu_hw_blk_reg_map *c = &intf->hw;
+	unsigned long cap = intf->cap->features;
+
+	if (cap & BIT(DPU_INTF_STATUS_SUPPORTED))
+		s->is_en = DPU_REG_READ(c, INTF_STATUS) & BIT(0);
+	else
+		s->is_en = DPU_REG_READ(c, INTF_TIMING_ENGINE_EN);
 
-	s->is_en = DPU_REG_READ(c, INTF_TIMING_ENGINE_EN);
 	s->is_prog_fetch_en = !!(DPU_REG_READ(c, INTF_CONFIG) & BIT(31));
 	if (s->is_en) {
 		s->frame_count = DPU_REG_READ(c, INTF_FRAME_COUNT);
-- 
2.7.4

[PATCH v14 06/14] drm/msm/disp/dpu: wait for extra vsync till timing engine status is disabled

[Vinod Polimera]

There can be a race between timing gen disable and vblank irq. The
wait post timing gen disable may return early but intf disable sequence
might not be completed. Ensure that, intf status is disabled before
we retire the function.

Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c    | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index 48c4810..0396084 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -523,6 +523,7 @@ static void dpu_encoder_phys_vid_disable(struct dpu_encoder_phys *phys_enc)
 {
 	unsigned long lock_flags;
 	int ret;
+	struct intf_status intf_status = {0};
 
 	if (!phys_enc->parent || !phys_enc->parent->dev) {
 		DPU_ERROR("invalid encoder/device\n");
@@ -567,6 +568,26 @@ static void dpu_encoder_phys_vid_disable(struct dpu_encoder_phys *phys_enc)
 		}
 	}
 
+	if (phys_enc->hw_intf && phys_enc->hw_intf->ops.get_status)
+		phys_enc->hw_intf->ops.get_status(phys_enc->hw_intf, &intf_status);
+
+	/*
+	 * Wait for a vsync if timing en status is on after timing engine
+	 * is disabled.
+	 */
+	if (intf_status.is_en && dpu_encoder_phys_vid_is_master(phys_enc)) {
+		spin_lock_irqsave(phys_enc->enc_spinlock, lock_flags);
+		dpu_encoder_phys_inc_pending(phys_enc);
+		spin_unlock_irqrestore(phys_enc->enc_spinlock, lock_flags);
+		ret = dpu_encoder_phys_vid_wait_for_vblank(phys_enc);
+		if (ret) {
+			atomic_set(&phys_enc->pending_kickoff_cnt, 0);
+			DRM_ERROR("wait disable failed: id:%u intf:%d ret:%d\n",
+				  DRMID(phys_enc->parent),
+				  phys_enc->hw_intf->idx - INTF_0, ret);
+		}
+	}
+
 	phys_enc->enable_state = DPU_ENC_DISABLED;
 }
 
-- 
2.7.4

[PATCH v14 07/14] drm/msm/disp/dpu: reset the datapath after timing engine disable

[Vinod Polimera]

Reset the datapath after disabling the timing gen, such that
it can start on a clean slate when the intf is enabled back.
This was a recommended sequence from the DPU HW programming guide.

Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
index 0396084..3a37429 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
@@ -588,6 +588,7 @@ static void dpu_encoder_phys_vid_disable(struct dpu_encoder_phys *phys_enc)
 		}
 	}
 
+	dpu_encoder_helper_phys_cleanup(phys_enc);
 	phys_enc->enable_state = DPU_ENC_DISABLED;
 }
 
-- 
2.7.4

[PATCH v14 08/14] drm/msm/dp: use atomic callbacks for DP bridge ops

[Vinod Polimera]

Use atomic variants for DP bridge callback functions so that
the atomic state can be accessed in the interface drivers.
The atomic state will help the driver find out if the display
is in self refresh state.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 9 ++++++---
 drivers/gpu/drm/msm/dp/dp_drm.c     | 6 +++---
 drivers/gpu/drm/msm/dp/dp_drm.h     | 9 ++++++---
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index bde1a7c..985287e 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1652,7 +1652,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 	return 0;
 }
 
-void dp_bridge_enable(struct drm_bridge *drm_bridge)
+void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
+			     struct drm_bridge_state *old_bridge_state)
 {
 	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
 	struct msm_dp *dp = dp_bridge->dp_display;
@@ -1707,7 +1708,8 @@ void dp_bridge_enable(struct drm_bridge *drm_bridge)
 	mutex_unlock(&dp_display->event_mutex);
 }
 
-void dp_bridge_disable(struct drm_bridge *drm_bridge)
+void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
+			      struct drm_bridge_state *old_bridge_state)
 {
 	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
 	struct msm_dp *dp = dp_bridge->dp_display;
@@ -1718,7 +1720,8 @@ void dp_bridge_disable(struct drm_bridge *drm_bridge)
 	dp_ctrl_push_idle(dp_display->ctrl);
 }
 
-void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
+void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
+				   struct drm_bridge_state *old_bridge_state)
 {
 	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
 	struct msm_dp *dp = dp_bridge->dp_display;
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 275370f..3252d50 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -94,9 +94,9 @@ static const struct drm_bridge_funcs dp_bridge_ops = {
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state   = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset           = drm_atomic_helper_bridge_reset,
-	.enable       = dp_bridge_enable,
-	.disable      = dp_bridge_disable,
-	.post_disable = dp_bridge_post_disable,
+	.atomic_enable          = dp_bridge_atomic_enable,
+	.atomic_disable         = dp_bridge_atomic_disable,
+	.atomic_post_disable    = dp_bridge_atomic_post_disable,
 	.mode_set     = dp_bridge_mode_set,
 	.mode_valid   = dp_bridge_mode_valid,
 	.get_modes    = dp_bridge_get_modes,
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.h b/drivers/gpu/drm/msm/dp/dp_drm.h
index 250f7c6..afe79b8 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.h
+++ b/drivers/gpu/drm/msm/dp/dp_drm.h
@@ -23,9 +23,12 @@ struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display, struct dr
 struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
 			struct drm_encoder *encoder);
 
-void dp_bridge_enable(struct drm_bridge *drm_bridge);
-void dp_bridge_disable(struct drm_bridge *drm_bridge);
-void dp_bridge_post_disable(struct drm_bridge *drm_bridge);
+void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
+			     struct drm_bridge_state *old_bridge_state);
+void dp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
+			      struct drm_bridge_state *old_bridge_state);
+void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
+				   struct drm_bridge_state *old_bridge_state);
 enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 					  const struct drm_display_info *info,
 					  const struct drm_display_mode *mode);
-- 
2.7.4

[PATCH v14 09/14] drm/msm/dp: Add basic PSR support for eDP

[Vinod Polimera]

Add support for basic panel self refresh (PSR) feature for eDP.
Add a new interface to set PSR state in the sink from DPU.
Program the eDP controller to issue PSR enter and exit SDP to
the sink.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_catalog.c |  80 ++++++++++++++++++++++
 drivers/gpu/drm/msm/dp/dp_catalog.h |   4 ++
 drivers/gpu/drm/msm/dp/dp_ctrl.c    |  80 ++++++++++++++++++++++
 drivers/gpu/drm/msm/dp/dp_ctrl.h    |   3 +
 drivers/gpu/drm/msm/dp/dp_display.c |  19 ++++++
 drivers/gpu/drm/msm/dp/dp_display.h |   2 +
 drivers/gpu/drm/msm/dp/dp_drm.c     | 133 +++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/msm/dp/dp_link.c    |  36 ++++++++++
 drivers/gpu/drm/msm/dp/dp_panel.c   |  22 ++++++
 drivers/gpu/drm/msm/dp/dp_panel.h   |   6 ++
 drivers/gpu/drm/msm/dp/dp_reg.h     |  27 ++++++++
 11 files changed, 411 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 676279d..c12a5d9 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -47,6 +47,14 @@
 #define DP_INTERRUPT_STATUS2_MASK \
 	(DP_INTERRUPT_STATUS2 << DP_INTERRUPT_STATUS_MASK_SHIFT)
 
+#define DP_INTERRUPT_STATUS4 \
+	(PSR_UPDATE_INT | PSR_CAPTURE_INT | PSR_EXIT_INT | \
+	PSR_UPDATE_ERROR_INT | PSR_WAKE_ERROR_INT)
+
+#define DP_INTERRUPT_MASK4 \
+	(PSR_UPDATE_MASK | PSR_CAPTURE_MASK | PSR_EXIT_MASK | \
+	PSR_UPDATE_ERROR_MASK | PSR_WAKE_ERROR_MASK)
+
 struct dp_catalog_private {
 	struct device *dev;
 	struct drm_device *drm_dev;
@@ -359,6 +367,23 @@ void dp_catalog_ctrl_lane_mapping(struct dp_catalog *dp_catalog)
 			ln_mapping);
 }
 
+void dp_catalog_ctrl_psr_mainlink_enable(struct dp_catalog *dp_catalog,
+						bool enable)
+{
+	u32 val;
+	struct dp_catalog_private *catalog = container_of(dp_catalog,
+				struct dp_catalog_private, dp_catalog);
+
+	val = dp_read_link(catalog, REG_DP_MAINLINK_CTRL);
+
+	if (enable)
+		val |= DP_MAINLINK_CTRL_ENABLE;
+	else
+		val &= ~DP_MAINLINK_CTRL_ENABLE;
+
+	dp_write_link(catalog, REG_DP_MAINLINK_CTRL, val);
+}
+
 void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog,
 						bool enable)
 {
@@ -610,6 +635,47 @@ void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog)
 	dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, DP_DP_HPD_CTRL_HPD_EN);
 }
 
+static void dp_catalog_enable_sdp(struct dp_catalog_private *catalog)
+{
+	/* trigger sdp */
+	dp_write_link(catalog, MMSS_DP_SDP_CFG3, UPDATE_SDP);
+	dp_write_link(catalog, MMSS_DP_SDP_CFG3, 0x0);
+}
+
+void dp_catalog_ctrl_config_psr(struct dp_catalog *dp_catalog)
+{
+	struct dp_catalog_private *catalog = container_of(dp_catalog,
+				struct dp_catalog_private, dp_catalog);
+	u32 config;
+
+	/* enable PSR1 function */
+	config = dp_read_link(catalog, REG_PSR_CONFIG);
+	config |= PSR1_SUPPORTED;
+	dp_write_link(catalog, REG_PSR_CONFIG, config);
+
+	dp_write_ahb(catalog, REG_DP_INTR_MASK4, DP_INTERRUPT_MASK4);
+	dp_catalog_enable_sdp(catalog);
+}
+
+void dp_catalog_ctrl_set_psr(struct dp_catalog *dp_catalog, bool enter)
+{
+	struct dp_catalog_private *catalog = container_of(dp_catalog,
+			struct dp_catalog_private, dp_catalog);
+	u32 cmd;
+
+	cmd = dp_read_link(catalog, REG_PSR_CMD);
+
+	cmd &= ~(PSR_ENTER | PSR_EXIT);
+
+	if (enter)
+		cmd |= PSR_ENTER;
+	else
+		cmd |= PSR_EXIT;
+
+	dp_catalog_enable_sdp(catalog);
+	dp_write_link(catalog, REG_PSR_CMD, cmd);
+}
+
 u32 dp_catalog_link_is_connected(struct dp_catalog *dp_catalog)
 {
 	struct dp_catalog_private *catalog = container_of(dp_catalog,
@@ -645,6 +711,20 @@ u32 dp_catalog_hpd_get_intr_status(struct dp_catalog *dp_catalog)
 	return isr & (mask | ~DP_DP_HPD_INT_MASK);
 }
 
+u32 dp_catalog_ctrl_read_psr_interrupt_status(struct dp_catalog *dp_catalog)
+{
+	struct dp_catalog_private *catalog = container_of(dp_catalog,
+				struct dp_catalog_private, dp_catalog);
+	u32 intr, intr_ack;
+
+	intr = dp_read_ahb(catalog, REG_DP_INTR_STATUS4);
+	intr_ack = (intr & DP_INTERRUPT_STATUS4)
+			<< DP_INTERRUPT_STATUS_ACK_SHIFT;
+	dp_write_ahb(catalog, REG_DP_INTR_STATUS4, intr_ack);
+
+	return intr;
+}
+
 int dp_catalog_ctrl_get_interrupt(struct dp_catalog *dp_catalog)
 {
 	struct dp_catalog_private *catalog = container_of(dp_catalog,
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index 1f717f4..2174bb5 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -93,6 +93,7 @@ void dp_catalog_ctrl_state_ctrl(struct dp_catalog *dp_catalog, u32 state);
 void dp_catalog_ctrl_config_ctrl(struct dp_catalog *dp_catalog, u32 config);
 void dp_catalog_ctrl_lane_mapping(struct dp_catalog *dp_catalog);
 void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog, bool enable);
+void dp_catalog_ctrl_psr_mainlink_enable(struct dp_catalog *dp_catalog, bool enable);
 void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog, u32 cc, u32 tb);
 void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, u32 rate,
 				u32 stream_rate_khz, bool fixed_nvid);
@@ -104,12 +105,15 @@ void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
 void dp_catalog_hpd_config_intr(struct dp_catalog *dp_catalog,
 			u32 intr_mask, bool en);
 void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog);
+void dp_catalog_ctrl_config_psr(struct dp_catalog *dp_catalog);
+void dp_catalog_ctrl_set_psr(struct dp_catalog *dp_catalog, bool enter);
 u32 dp_catalog_link_is_connected(struct dp_catalog *dp_catalog);
 u32 dp_catalog_hpd_get_intr_status(struct dp_catalog *dp_catalog);
 void dp_catalog_ctrl_phy_reset(struct dp_catalog *dp_catalog);
 int dp_catalog_ctrl_update_vx_px(struct dp_catalog *dp_catalog, u8 v_level,
 				u8 p_level);
 int dp_catalog_ctrl_get_interrupt(struct dp_catalog *dp_catalog);
+u32 dp_catalog_ctrl_read_psr_interrupt_status(struct dp_catalog *dp_catalog);
 void dp_catalog_ctrl_update_transfer_unit(struct dp_catalog *dp_catalog,
 				u32 dp_tu, u32 valid_boundary,
 				u32 valid_boundary2);
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index dd26ca6..ea1c1f0 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -22,6 +22,7 @@
 
 #define DP_KHZ_TO_HZ 1000
 #define IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES	(30 * HZ / 1000) /* 30 ms */
+#define PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES       (300 * HZ / 1000) /* 300 ms */
 #define WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES (HZ / 2)
 
 #define DP_CTRL_INTR_READY_FOR_VIDEO     BIT(0)
@@ -80,6 +81,7 @@ struct dp_ctrl_private {
 	struct dp_catalog *catalog;
 
 	struct completion idle_comp;
+	struct completion psr_op_comp;
 	struct completion video_comp;
 };
 
@@ -153,6 +155,9 @@ static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
 	config |= DP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN;
 	config |= DP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK;
 
+	if (ctrl->panel->psr_cap.version)
+		config |= DP_CONFIGURATION_CTRL_SEND_VSC;
+
 	dp_catalog_ctrl_config_ctrl(ctrl->catalog, config);
 }
 
@@ -1375,6 +1380,64 @@ void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable)
 	dp_catalog_ctrl_enable_irq(ctrl->catalog, enable);
 }
 
+void dp_ctrl_config_psr(struct dp_ctrl *dp_ctrl)
+{
+	u8 cfg;
+	struct dp_ctrl_private *ctrl = container_of(dp_ctrl,
+			struct dp_ctrl_private, dp_ctrl);
+
+	if (!ctrl->panel->psr_cap.version)
+		return;
+
+	dp_catalog_ctrl_config_psr(ctrl->catalog);
+
+	cfg = DP_PSR_ENABLE;
+	drm_dp_dpcd_write(ctrl->aux, DP_PSR_EN_CFG, &cfg, 1);
+}
+
+void dp_ctrl_set_psr(struct dp_ctrl *dp_ctrl, bool enter)
+{
+	struct dp_ctrl_private *ctrl = container_of(dp_ctrl,
+			struct dp_ctrl_private, dp_ctrl);
+
+	if (!ctrl->panel->psr_cap.version)
+		return;
+
+	/*
+	 * When entering PSR,
+	 * 1. Send PSR enter SDP and wait for the PSR_UPDATE_INT
+	 * 2. Turn off video
+	 * 3. Disable the mainlink
+	 *
+	 * When exiting PSR,
+	 * 1. Enable the mainlink
+	 * 2. Send the PSR exit SDP
+	 */
+	if (enter) {
+		reinit_completion(&ctrl->psr_op_comp);
+		dp_catalog_ctrl_set_psr(ctrl->catalog, true);
+
+		if (!wait_for_completion_timeout(&ctrl->psr_op_comp,
+			PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES)) {
+			DRM_ERROR("PSR_ENTRY timedout\n");
+			dp_catalog_ctrl_set_psr(ctrl->catalog, false);
+			return;
+		}
+
+		dp_ctrl_push_idle(dp_ctrl);
+		dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
+
+		dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, false);
+	} else {
+		dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, true);
+
+		dp_catalog_ctrl_set_psr(ctrl->catalog, false);
+		dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
+		dp_ctrl_wait4video_ready(ctrl);
+		dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
+	}
+}
+
 void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl)
 {
 	struct dp_ctrl_private *ctrl;
@@ -1989,6 +2052,22 @@ void dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
 
 	ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
 
+	if (ctrl->panel->psr_cap.version) {
+		isr = dp_catalog_ctrl_read_psr_interrupt_status(ctrl->catalog);
+
+		if (isr)
+			complete(&ctrl->psr_op_comp);
+
+		if (isr & PSR_EXIT_INT)
+			drm_dbg_dp(ctrl->drm_dev, "PSR exit done\n");
+
+		if (isr & PSR_UPDATE_INT)
+			drm_dbg_dp(ctrl->drm_dev, "PSR frame update done\n");
+
+		if (isr & PSR_CAPTURE_INT)
+			drm_dbg_dp(ctrl->drm_dev, "PSR frame capture done\n");
+	}
+
 	isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog);
 
 	if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) {
@@ -2035,6 +2114,7 @@ struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
 		dev_err(dev, "failed to add DP OPP table\n");
 
 	init_completion(&ctrl->idle_comp);
+	init_completion(&ctrl->psr_op_comp);
 	init_completion(&ctrl->video_comp);
 
 	/* in parameters */
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
index 9f29734..b226683 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
@@ -37,4 +37,7 @@ void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl);
 void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl);
 void dp_ctrl_irq_phy_exit(struct dp_ctrl *dp_ctrl);
 
+void dp_ctrl_set_psr(struct dp_ctrl *dp_ctrl, bool enable);
+void dp_ctrl_config_psr(struct dp_ctrl *dp_ctrl);
+
 #endif /* _DP_CTRL_H_ */
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 985287e..86ed80c 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -406,6 +406,8 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
 
 	edid = dp->panel->edid;
 
+	dp->dp_display.psr_supported = dp->panel->psr_cap.version;
+
 	dp->audio_supported = drm_detect_monitor_audio(edid);
 	dp_panel_handle_sink_request(dp->panel);
 
@@ -910,6 +912,10 @@ static int dp_display_post_enable(struct msm_dp *dp_display)
 
 	/* signal the connect event late to synchronize video and display */
 	dp_display_handle_plugged_change(dp_display, true);
+
+	if (dp_display->psr_supported)
+		dp_ctrl_config_psr(dp->ctrl);
+
 	return 0;
 }
 
@@ -1104,6 +1110,19 @@ static void dp_display_config_hpd(struct dp_display_private *dp)
 	enable_irq(dp->irq);
 }
 
+void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
+{
+	struct dp_display_private *dp;
+
+	if (!dp_display) {
+		DRM_ERROR("invalid params\n");
+		return;
+	}
+
+	dp = container_of(dp_display, struct dp_display_private, dp_display);
+	dp_ctrl_set_psr(dp->ctrl, enter);
+}
+
 static int hpd_event_thread(void *data)
 {
 	struct dp_display_private *dp_priv;
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index 371337d..1e9415a 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -29,6 +29,7 @@ struct msm_dp {
 
 	u32 max_dp_lanes;
 	struct dp_audio *dp_audio;
+	bool psr_supported;
 };
 
 int dp_display_set_plugged_cb(struct msm_dp *dp_display,
@@ -39,5 +40,6 @@ bool dp_display_check_video_test(struct msm_dp *dp_display);
 int dp_display_get_test_bpp(struct msm_dp *dp_display);
 void dp_display_signal_audio_start(struct msm_dp *dp_display);
 void dp_display_signal_audio_complete(struct msm_dp *dp_display);
+void dp_display_set_psr(struct msm_dp *dp, bool enter);
 
 #endif /* _DP_DISPLAY_H_ */
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 3252d50..3b38bd9 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -107,6 +107,137 @@ static const struct drm_bridge_funcs dp_bridge_ops = {
 	.hpd_notify   = dp_bridge_hpd_notify,
 };
 
+static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
+				   struct drm_bridge_state *bridge_state,
+				   struct drm_crtc_state *crtc_state,
+				   struct drm_connector_state *conn_state)
+{
+	struct msm_dp *dp = to_dp_bridge(drm_bridge)->dp_display;
+
+	if (WARN_ON(!conn_state))
+		return -ENODEV;
+
+	if (!conn_state->crtc || !crtc_state)
+		return 0;
+
+	if (crtc_state->self_refresh_active && !dp->psr_supported)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void edp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
+				     struct drm_bridge_state *old_bridge_state)
+{
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_crtc_state;
+	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
+	struct msm_dp *dp = dp_bridge->dp_display;
+
+	/*
+	 * Check the old state of the crtc to determine if the panel
+	 * was put into psr state previously by the edp_bridge_atomic_disable.
+	 * If the panel is in psr, just exit psr state and skip the full
+	 * bridge enable sequence.
+	 */
+	crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state,
+						   drm_bridge->encoder);
+	if (!crtc)
+		return;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
+
+	if (old_crtc_state && old_crtc_state->self_refresh_active) {
+		dp_display_set_psr(dp, false);
+		return;
+	}
+
+	dp_bridge_atomic_enable(drm_bridge, old_bridge_state);
+}
+
+static void edp_bridge_atomic_disable(struct drm_bridge *drm_bridge,
+				      struct drm_bridge_state *old_bridge_state)
+{
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state = NULL, *old_crtc_state = NULL;
+	struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge);
+	struct msm_dp *dp = dp_bridge->dp_display;
+
+	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state,
+						   drm_bridge->encoder);
+	if (!crtc)
+		goto out;
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
+	if (!new_crtc_state)
+		goto out;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
+	if (!old_crtc_state)
+		goto out;
+
+	/*
+	 * Set self refresh mode if current crtc state is active.
+	 *
+	 * If old crtc state is active, then this is a display disable
+	 * call while the sink is in psr state. So, exit psr here.
+	 * The eDP controller will be disabled in the
+	 * edp_bridge_atomic_post_disable function.
+	 *
+	 * We observed sink is stuck in self refresh if psr exit is skipped
+	 * when display disable occurs while the sink is in psr state.
+	 */
+	if (new_crtc_state->self_refresh_active) {
+		dp_display_set_psr(dp, true);
+		return;
+	} else if (old_crtc_state->self_refresh_active) {
+		dp_display_set_psr(dp, false);
+		return;
+	}
+
+out:
+	dp_bridge_atomic_disable(drm_bridge, old_bridge_state);
+}
+
+static void edp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
+				struct drm_bridge_state *old_bridge_state)
+{
+	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+
+	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state,
+						   drm_bridge->encoder);
+	if (!crtc)
+		return;
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
+	if (!new_crtc_state)
+		return;
+
+	/*
+	 * Self refresh mode is already set in edp_bridge_atomic_disable.
+	 */
+	if (new_crtc_state->self_refresh_active)
+		return;
+
+	dp_bridge_atomic_post_disable(drm_bridge, old_bridge_state);
+}
+
+static const struct drm_bridge_funcs edp_bridge_ops = {
+	.atomic_enable = edp_bridge_atomic_enable,
+	.atomic_disable = edp_bridge_atomic_disable,
+	.atomic_post_disable = edp_bridge_atomic_post_disable,
+	.mode_set = dp_bridge_mode_set,
+	.mode_valid = dp_bridge_mode_valid,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_check = edp_bridge_atomic_check,
+};
+
 struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
 			struct drm_encoder *encoder)
 {
@@ -121,7 +252,7 @@ struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *
 	dp_bridge->dp_display = dp_display;
 
 	bridge = &dp_bridge->bridge;
-	bridge->funcs = &dp_bridge_ops;
+	bridge->funcs = dp_display->is_edp ? &edp_bridge_ops : &dp_bridge_ops;
 	bridge->type = dp_display->connector_type;
 
 	/*
diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
index f1f1d64..5a4817a 100644
--- a/drivers/gpu/drm/msm/dp/dp_link.c
+++ b/drivers/gpu/drm/msm/dp/dp_link.c
@@ -937,6 +937,38 @@ static int dp_link_process_phy_test_pattern_request(
 	return 0;
 }
 
+static bool dp_link_read_psr_error_status(struct dp_link_private *link)
+{
+	u8 status;
+
+	drm_dp_dpcd_read(link->aux, DP_PSR_ERROR_STATUS, &status, 1);
+
+	if (status & DP_PSR_LINK_CRC_ERROR)
+		DRM_ERROR("PSR LINK CRC ERROR\n");
+	else if (status & DP_PSR_RFB_STORAGE_ERROR)
+		DRM_ERROR("PSR RFB STORAGE ERROR\n");
+	else if (status & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
+		DRM_ERROR("PSR VSC SDP UNCORRECTABLE ERROR\n");
+	else
+		return false;
+
+	return true;
+}
+
+static bool dp_link_psr_capability_changed(struct dp_link_private *link)
+{
+	u8 status;
+
+	drm_dp_dpcd_read(link->aux, DP_PSR_ESI, &status, 1);
+
+	if (status & DP_PSR_CAPS_CHANGE) {
+		drm_dbg_dp(link->drm_dev, "PSR Capability Change\n");
+		return true;
+	}
+
+	return false;
+}
+
 static u8 get_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
 {
 	return link_status[r - DP_LANE0_1_STATUS];
@@ -1055,6 +1087,10 @@ int dp_link_process_request(struct dp_link *dp_link)
 		dp_link->sink_request |= DP_TEST_LINK_TRAINING;
 	} else if (!dp_link_process_phy_test_pattern_request(link)) {
 		dp_link->sink_request |= DP_TEST_LINK_PHY_TEST_PATTERN;
+	} else if (dp_link_read_psr_error_status(link)) {
+		DRM_ERROR("PSR IRQ_HPD received\n");
+	} else if (dp_link_psr_capability_changed(link)) {
+		drm_dbg_dp(link->drm_dev, "PSR Capabiity changed");
 	} else {
 		ret = dp_link_process_link_status_update(link);
 		if (!ret) {
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 1800d89..42d5251 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -20,6 +20,27 @@ struct dp_panel_private {
 	bool aux_cfg_update_done;
 };
 
+static void dp_panel_read_psr_cap(struct dp_panel_private *panel)
+{
+	ssize_t rlen;
+	struct dp_panel *dp_panel;
+
+	dp_panel = &panel->dp_panel;
+
+	/* edp sink */
+	if (dp_panel->dpcd[DP_EDP_CONFIGURATION_CAP]) {
+		rlen = drm_dp_dpcd_read(panel->aux, DP_PSR_SUPPORT,
+				&dp_panel->psr_cap, sizeof(dp_panel->psr_cap));
+		if (rlen == sizeof(dp_panel->psr_cap)) {
+			drm_dbg_dp(panel->drm_dev,
+				"psr version: 0x%x, psr_cap: 0x%x\n",
+				dp_panel->psr_cap.version,
+				dp_panel->psr_cap.capabilities);
+		} else
+			DRM_ERROR("failed to read psr info, rlen=%zd\n", rlen);
+	}
+}
+
 static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
 {
 	int rc = 0;
@@ -107,6 +128,7 @@ static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
 		}
 	}
 
+	dp_panel_read_psr_cap(panel);
 end:
 	return rc;
 }
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
index f04d021..45208b4 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.h
+++ b/drivers/gpu/drm/msm/dp/dp_panel.h
@@ -34,6 +34,11 @@ struct dp_panel_in {
 	struct dp_catalog *catalog;
 };
 
+struct dp_panel_psr {
+	u8 version;
+	u8 capabilities;
+};
+
 struct dp_panel {
 	/* dpcd raw data */
 	u8 dpcd[DP_RECEIVER_CAP_SIZE + 1];
@@ -46,6 +51,7 @@ struct dp_panel {
 	struct edid *edid;
 	struct drm_connector *connector;
 	struct dp_display_mode dp_mode;
+	struct dp_panel_psr psr_cap;
 	bool video_test;
 
 	u32 vic;
diff --git a/drivers/gpu/drm/msm/dp/dp_reg.h b/drivers/gpu/drm/msm/dp/dp_reg.h
index 2686028..ea85a69 100644
--- a/drivers/gpu/drm/msm/dp/dp_reg.h
+++ b/drivers/gpu/drm/msm/dp/dp_reg.h
@@ -22,6 +22,20 @@
 #define REG_DP_INTR_STATUS2			(0x00000024)
 #define REG_DP_INTR_STATUS3			(0x00000028)
 
+#define REG_DP_INTR_STATUS4			(0x0000002C)
+#define PSR_UPDATE_INT				(0x00000001)
+#define PSR_CAPTURE_INT				(0x00000004)
+#define PSR_EXIT_INT				(0x00000010)
+#define PSR_UPDATE_ERROR_INT			(0x00000040)
+#define PSR_WAKE_ERROR_INT			(0x00000100)
+
+#define REG_DP_INTR_MASK4			(0x00000030)
+#define PSR_UPDATE_MASK				(0x00000001)
+#define PSR_CAPTURE_MASK			(0x00000002)
+#define PSR_EXIT_MASK				(0x00000004)
+#define PSR_UPDATE_ERROR_MASK			(0x00000008)
+#define PSR_WAKE_ERROR_MASK			(0x00000010)
+
 #define REG_DP_DP_HPD_CTRL			(0x00000000)
 #define DP_DP_HPD_CTRL_HPD_EN			(0x00000001)
 
@@ -164,6 +178,16 @@
 #define MMSS_DP_AUDIO_TIMING_RBR_48		(0x00000094)
 #define MMSS_DP_AUDIO_TIMING_HBR_48		(0x00000098)
 
+#define REG_PSR_CONFIG				(0x00000100)
+#define DISABLE_PSR				(0x00000000)
+#define PSR1_SUPPORTED				(0x00000001)
+#define PSR2_WITHOUT_FRAMESYNC			(0x00000002)
+#define PSR2_WITH_FRAMESYNC			(0x00000003)
+
+#define REG_PSR_CMD				(0x00000110)
+#define PSR_ENTER				(0x00000001)
+#define PSR_EXIT				(0x00000002)
+
 #define MMSS_DP_PSR_CRC_RG			(0x00000154)
 #define MMSS_DP_PSR_CRC_B			(0x00000158)
 
@@ -184,6 +208,9 @@
 #define MMSS_DP_AUDIO_STREAM_0			(0x00000240)
 #define MMSS_DP_AUDIO_STREAM_1			(0x00000244)
 
+#define MMSS_DP_SDP_CFG3			(0x0000024c)
+#define UPDATE_SDP				(0x00000001)
+
 #define MMSS_DP_EXTENSION_0			(0x00000250)
 #define MMSS_DP_EXTENSION_1			(0x00000254)
 #define MMSS_DP_EXTENSION_2			(0x00000258)
-- 
2.7.4

[PATCH v14 10/14] drm/msm/dp: use the eDP bridge ops to validate eDP modes

[Vinod Polimera]

The eDP and DP interfaces shared the bridge operations and
the eDP specific changes were implemented under is_edp check.
To add psr support for eDP, we started using a new set of eDP
bridge ops. We are moving the eDP specific code in the
dp_bridge_mode_valid function to a new eDP function,
edp_bridge_mode_valid under the eDP bridge ops.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c |  8 --------
 drivers/gpu/drm/msm/dp/dp_drm.c     | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 86ed80c..ffb21a6 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -996,14 +996,6 @@ enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 		return -EINVAL;
 	}
 
-	/*
-	 * The eDP controller currently does not have a reliable way of
-	 * enabling panel power to read sink capabilities. So, we rely
-	 * on the panel driver to populate only supported modes for now.
-	 */
-	if (dp->is_edp)
-		return MODE_OK;
-
 	if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 		return MODE_CLOCK_HIGH;
 
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 3b38bd9..029e08c 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -226,12 +226,44 @@ static void edp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
 	dp_bridge_atomic_post_disable(drm_bridge, old_bridge_state);
 }
 
+/**
+ * edp_bridge_mode_valid - callback to determine if specified mode is valid
+ * @bridge: Pointer to drm bridge structure
+ * @info: display info
+ * @mode: Pointer to drm mode structure
+ * Returns: Validity status for specified mode
+ */
+static enum drm_mode_status edp_bridge_mode_valid(struct drm_bridge *bridge,
+					  const struct drm_display_info *info,
+					  const struct drm_display_mode *mode)
+{
+	struct msm_dp *dp;
+	int mode_pclk_khz = mode->clock;
+
+	dp = to_dp_bridge(bridge)->dp_display;
+
+	if (!dp || !mode_pclk_khz || !dp->connector) {
+		DRM_ERROR("invalid params\n");
+		return -EINVAL;
+	}
+
+	if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
+		return MODE_CLOCK_HIGH;
+
+	/*
+	 * The eDP controller currently does not have a reliable way of
+	 * enabling panel power to read sink capabilities. So, we rely
+	 * on the panel driver to populate only supported modes for now.
+	 */
+	return MODE_OK;
+}
+
 static const struct drm_bridge_funcs edp_bridge_ops = {
 	.atomic_enable = edp_bridge_atomic_enable,
 	.atomic_disable = edp_bridge_atomic_disable,
 	.atomic_post_disable = edp_bridge_atomic_post_disable,
 	.mode_set = dp_bridge_mode_set,
-	.mode_valid = dp_bridge_mode_valid,
+	.mode_valid = edp_bridge_mode_valid,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
-- 
2.7.4

[PATCH v14 11/14] drm/msm/disp/dpu: use atomic enable/disable callbacks for encoder functions

[Vinod Polimera]

Use atomic variants for encoder callback functions such that
certain states like self-refresh can be accessed as part of
enable/disable sequence.

Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index c237003..01b7509 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1171,7 +1171,8 @@ void dpu_encoder_virt_runtime_resume(struct drm_encoder *drm_enc)
 	mutex_unlock(&dpu_enc->enc_lock);
 }
 
-static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
+static void dpu_encoder_virt_atomic_enable(struct drm_encoder *drm_enc,
+					struct drm_atomic_state *state)
 {
 	struct dpu_encoder_virt *dpu_enc = NULL;
 	int ret = 0;
@@ -1207,7 +1208,8 @@ static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
 	mutex_unlock(&dpu_enc->enc_lock);
 }
 
-static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
+static void dpu_encoder_virt_atomic_disable(struct drm_encoder *drm_enc,
+					struct drm_atomic_state *state)
 {
 	struct dpu_encoder_virt *dpu_enc = NULL;
 	int i = 0;
@@ -2388,8 +2390,8 @@ static void dpu_encoder_frame_done_timeout(struct timer_list *t)
 
 static const struct drm_encoder_helper_funcs dpu_encoder_helper_funcs = {
 	.atomic_mode_set = dpu_encoder_virt_atomic_mode_set,
-	.disable = dpu_encoder_virt_disable,
-	.enable = dpu_encoder_virt_enable,
+	.atomic_disable = dpu_encoder_virt_atomic_disable,
+	.atomic_enable = dpu_encoder_virt_atomic_enable,
 	.atomic_check = dpu_encoder_virt_atomic_check,
 };
 
-- 
2.7.4

[PATCH v14 12/14] drm/msm/disp/dpu: add PSR support for eDP interface in dpu driver

[Vinod Polimera]

Enable PSR on eDP interface using drm self-refresh librabry.
This patch uses a trigger from self-refresh library to enter/exit
into PSR, when there are no updates from framework.

Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 13 ++++++++++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 14 ++++++++++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c     |  2 +-
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index f29a339..60e5984 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -21,6 +21,7 @@
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_rect.h>
 #include <drm/drm_vblank.h>
+#include <drm/drm_self_refresh_helper.h>
 
 #include "dpu_kms.h"
 #include "dpu_hw_lm.h"
@@ -1021,6 +1022,9 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
 
 	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
 
+	if (old_crtc_state->self_refresh_active)
+		return;
+
 	/* Disable/save vblank irq handling */
 	drm_crtc_vblank_off(crtc);
 
@@ -1577,7 +1581,7 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
 {
 	struct drm_crtc *crtc = NULL;
 	struct dpu_crtc *dpu_crtc = NULL;
-	int i;
+	int i, ret;
 
 	dpu_crtc = kzalloc(sizeof(*dpu_crtc), GFP_KERNEL);
 	if (!dpu_crtc)
@@ -1614,6 +1618,13 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
 	/* initialize event handling */
 	spin_lock_init(&dpu_crtc->event_lock);
 
+	ret = drm_self_refresh_helper_init(crtc);
+	if (ret) {
+		DPU_ERROR("Failed to initialize %s with self-refresh helpers %d\n",
+			crtc->name, ret);
+		return ERR_PTR(ret);
+	}
+
 	DRM_DEBUG_KMS("%s: successfully initialized crtc\n", dpu_crtc->name);
 	return crtc;
 }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 01b7509..450abb1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -12,6 +12,7 @@
 #include <linux/kthread.h>
 #include <linux/seq_file.h>
 
+#include <drm/drm_atomic.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_file.h>
 #include <drm/drm_probe_helper.h>
@@ -1212,11 +1213,24 @@ static void dpu_encoder_virt_atomic_disable(struct drm_encoder *drm_enc,
 					struct drm_atomic_state *state)
 {
 	struct dpu_encoder_virt *dpu_enc = NULL;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_state = NULL;
 	int i = 0;
 
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
 	DPU_DEBUG_ENC(dpu_enc, "\n");
 
+	crtc = drm_atomic_get_old_crtc_for_encoder(state, drm_enc);
+	if (crtc)
+		old_state = drm_atomic_get_old_crtc_state(state, crtc);
+
+	/*
+	 * The encoder is already disabled if self refresh mode was set earlier,
+	 * in the old_state for the corresponding crtc.
+	 */
+	if (old_state && old_state->self_refresh_active)
+		return;
+
 	mutex_lock(&dpu_enc->enc_lock);
 	dpu_enc->enabled = false;
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index a683bd9..681dd2e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -491,7 +491,7 @@ static void dpu_kms_wait_for_commit_done(struct msm_kms *kms,
 		return;
 	}
 
-	if (!crtc->state->active) {
+	if (!drm_atomic_crtc_effectively_active(crtc->state)) {
 		DPU_DEBUG("[crtc:%d] not active\n", crtc->base.id);
 		return;
 	}
-- 
2.7.4

[PATCH v14 13/14] drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable during self refresh

[Vinod Polimera]

Populate the enocder software structure to reflect the updated
crtc appropriately during crtc enable/disable for a new commit
while taking care of the self refresh transitions when crtc
disable is triggered from the drm self refresh library.

Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 60e5984..b1ec0c3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1022,8 +1022,17 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
 
 	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
 
-	if (old_crtc_state->self_refresh_active)
+	/* If disable is triggered while in self refresh mode,
+	 * reset the encoder software state so that in enable
+	 * it won't trigger a warn while assigning crtc.
+	 */
+	if (old_crtc_state->self_refresh_active) {
+		drm_for_each_encoder_mask(encoder, crtc->dev,
+					old_crtc_state->encoder_mask) {
+			dpu_encoder_assign_crtc(encoder, NULL);
+		}
 		return;
+	}
 
 	/* Disable/save vblank irq handling */
 	drm_crtc_vblank_off(crtc);
@@ -1036,7 +1045,14 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
 		 */
 		if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
 			release_bandwidth = true;
-		dpu_encoder_assign_crtc(encoder, NULL);
+
+		/*
+		 * If disable is triggered during psr active(e.g: screen dim in PSR),
+		 * we will need encoder->crtc connection to process the device sleep &
+		 * preserve it during psr sequence.
+		 */
+		if (!crtc->state->self_refresh_active)
+			dpu_encoder_assign_crtc(encoder, NULL);
 	}
 
 	/* wait for frame_event_done completion */
@@ -1084,6 +1100,9 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
 	struct drm_encoder *encoder;
 	bool request_bandwidth = false;
+	struct drm_crtc_state *old_crtc_state;
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
 
 	pm_runtime_get_sync(crtc->dev->dev);
 
@@ -1106,8 +1125,10 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
 	dpu_crtc->enabled = true;
 
-	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
-		dpu_encoder_assign_crtc(encoder, crtc);
+	if (!old_crtc_state->self_refresh_active) {
+		drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
+			dpu_encoder_assign_crtc(encoder, crtc);
+	}
 
 	/* Enable/restore vblank irq handling */
 	drm_crtc_vblank_on(crtc);
-- 
2.7.4

RE: [PATCH v14 13/14] drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable during self refresh

[Vinod Polimera]

> -----Original Message-----
> From: Vinod Polimera (QUIC) <quic_vpolimer@quicinc.com>
> Sent: Thursday, March 2, 2023 10:03 PM
> To: dri-devel@lists.freedesktop.org; linux-arm-msm@vger.kernel.org;
> freedreno@lists.freedesktop.org; devicetree@vger.kernel.org
> Cc: Vinod Polimera (QUIC) <quic_vpolimer@quicinc.com>; linux-
> kernel@vger.kernel.org; robdclark@gmail.com; dianders@chromium.org;
> swboyd@chromium.org; Kalyan Thota (QUIC) <quic_kalyant@quicinc.com>;
> dmitry.baryshkov@linaro.org; Kuogee Hsieh (QUIC)
> <quic_khsieh@quicinc.com>; Vishnuvardhan Prodduturi (QUIC)
> <quic_vproddut@quicinc.com>; Bjorn Andersson (QUIC)
> <quic_bjorande@quicinc.com>; Abhinav Kumar (QUIC)
> <quic_abhinavk@quicinc.com>; Sankeerth Billakanti (QUIC)
> <quic_sbillaka@quicinc.com>
> Subject: [PATCH v14 13/14] drm/msm/disp/dpu: update dpu_enc crtc state
> on crtc enable/disable during self refresh
> 
> Populate the enocder software structure to reflect the updated
> crtc appropriately during crtc enable/disable for a new commit
> while taking care of the self refresh transitions when crtc
> disable is triggered from the drm self refresh library.
> 
> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Adding the RB tag which was reviewed by Dmitry on V13.

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 29
> +++++++++++++++++++++++++----
>  1 file changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 60e5984..b1ec0c3 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -1022,8 +1022,17 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
> 
>  	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
> 
> -	if (old_crtc_state->self_refresh_active)
> +	/* If disable is triggered while in self refresh mode,
> +	 * reset the encoder software state so that in enable
> +	 * it won't trigger a warn while assigning crtc.
> +	 */
> +	if (old_crtc_state->self_refresh_active) {
> +		drm_for_each_encoder_mask(encoder, crtc->dev,
> +					old_crtc_state->encoder_mask) {
> +			dpu_encoder_assign_crtc(encoder, NULL);
> +		}
>  		return;
> +	}
> 
>  	/* Disable/save vblank irq handling */
>  	drm_crtc_vblank_off(crtc);
> @@ -1036,7 +1045,14 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
>  		 */
>  		if (dpu_encoder_get_intf_mode(encoder) ==
> INTF_MODE_VIDEO)
>  			release_bandwidth = true;
> -		dpu_encoder_assign_crtc(encoder, NULL);
> +
> +		/*
> +		 * If disable is triggered during psr active(e.g: screen dim in
> PSR),
> +		 * we will need encoder->crtc connection to process the
> device sleep &
> +		 * preserve it during psr sequence.
> +		 */
> +		if (!crtc->state->self_refresh_active)
> +			dpu_encoder_assign_crtc(encoder, NULL);
>  	}
> 
>  	/* wait for frame_event_done completion */
> @@ -1084,6 +1100,9 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
>  	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
>  	struct drm_encoder *encoder;
>  	bool request_bandwidth = false;
> +	struct drm_crtc_state *old_crtc_state;
> +
> +	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
> 
>  	pm_runtime_get_sync(crtc->dev->dev);
> 
> @@ -1106,8 +1125,10 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
>  	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
>  	dpu_crtc->enabled = true;
> 
> -	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state-
> >encoder_mask)
> -		dpu_encoder_assign_crtc(encoder, crtc);
> +	if (!old_crtc_state->self_refresh_active) {
> +		drm_for_each_encoder_mask(encoder, crtc->dev, crtc-
> >state->encoder_mask)
> +			dpu_encoder_assign_crtc(encoder, crtc);
> +	}
> 
>  	/* Enable/restore vblank irq handling */
>  	drm_crtc_vblank_on(crtc);
> --
> 2.7.4

[PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Vinod Polimera]

For the PSR to kick in, self_refresh_aware has to be set.
Initialize it based on the PSR support for the eDP interface.

Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
---
 drivers/gpu/drm/msm/dp/dp_drm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index 029e08c..785d766 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -117,6 +117,8 @@ static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
 	if (WARN_ON(!conn_state))
 		return -ENODEV;
 
+	conn_state->self_refresh_aware = dp->psr_supported;
+
 	if (!conn_state->crtc || !crtc_state)
 		return 0;
 
-- 
2.7.4

Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Dmitry Baryshkov]

On 02/03/2023 18:33, Vinod Polimera wrote:
> For the PSR to kick in, self_refresh_aware has to be set.
> Initialize it based on the PSR support for the eDP interface.
> 
> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry

Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Bjorn Andersson]

On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> For the PSR to kick in, self_refresh_aware has to be set.
> Initialize it based on the PSR support for the eDP interface.
> 

When I boot my sc8280xp devices (CRD and X13s) to console with this
patch included I get a login prompt, and then there are no more screen
updates.

Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.

Blindly login in and launching Wayland works and from then on screen
updates works as expected.

Switching from Wayland to another virtual terminal causes the problem to
re-appear, no updates after the initial refresh, switching back go the
Wayland-terminal crashed the machine.



Reverting this single patch resolves both the issue with the console
updating as exected and flipping between the virtual terminal with
Wayland and the others no longer crashes my machine.

Regards,
Bjorn

> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_drm.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> index 029e08c..785d766 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> @@ -117,6 +117,8 @@ static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
>  	if (WARN_ON(!conn_state))
>  		return -ENODEV;
>  
> +	conn_state->self_refresh_aware = dp->psr_supported;
> +
>  	if (!conn_state->crtc || !crtc_state)
>  		return 0;
>  
> -- 
> 2.7.4
> 

Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Bjorn Andersson]

On Sun, Mar 26, 2023 at 09:27:23AM -0700, Bjorn Andersson wrote:
> On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > For the PSR to kick in, self_refresh_aware has to be set.
> > Initialize it based on the PSR support for the eDP interface.
> > 
> 
> When I boot my sc8280xp devices (CRD and X13s) to console with this
> patch included I get a login prompt, and then there are no more screen
> updates.
> 
> Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
> 
> Blindly login in and launching Wayland works and from then on screen
> updates works as expected.
> 
> Switching from Wayland to another virtual terminal causes the problem to
> re-appear, no updates after the initial refresh, switching back go the
> Wayland-terminal crashed the machine.
> 

Also, trying to bring the eDP-screen back from DPMS gives me:

<3>[ 2355.218099] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.218926] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.262859] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.263600] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.305211] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.305955] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.345250] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
<3>[ 2355.346026] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
<3>[ 2355.405650] [drm:dp_display_process_hpd_high [msm]] *ERROR* failed to complete DP link training
<3>[ 2355.668988] [drm:dpu_encoder_phys_vid_wait_for_commit_done:488] [dpu error]vblank timeout
<3>[ 2355.669030] [drm:dpu_kms_wait_for_commit_done:510] [dpu error]wait for commit done returned -110
<3>[ 2355.699989] [drm:dpu_encoder_frame_done_timeout:2398] [dpu error]enc35 frame done timeout

And then the machine just resets.

Regards,
Bjorn

> 
> 
> Reverting this single patch resolves both the issue with the console
> updating as exected and flipping between the virtual terminal with
> Wayland and the others no longer crashes my machine.
> 
> Regards,
> Bjorn
> 
> > Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> > ---
> >  drivers/gpu/drm/msm/dp/dp_drm.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> > index 029e08c..785d766 100644
> > --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> > +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> > @@ -117,6 +117,8 @@ static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
> >  	if (WARN_ON(!conn_state))
> >  		return -ENODEV;
> >  
> > +	conn_state->self_refresh_aware = dp->psr_supported;
> > +
> >  	if (!conn_state->crtc || !crtc_state)
> >  		return 0;
> >  
> > -- 
> > 2.7.4
> > 

Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Stephen Boyd]

Quoting Bjorn Andersson (2023-03-26 09:35:56)
> On Sun, Mar 26, 2023 at 09:27:23AM -0700, Bjorn Andersson wrote:
> > On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > > For the PSR to kick in, self_refresh_aware has to be set.
> > > Initialize it based on the PSR support for the eDP interface.
> > >
> >
> > When I boot my sc8280xp devices (CRD and X13s) to console with this
> > patch included I get a login prompt, and then there are no more screen
> > updates.
> >
> > Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
> >
> > Blindly login in and launching Wayland works and from then on screen
> > updates works as expected.
> >
> > Switching from Wayland to another virtual terminal causes the problem to
> > re-appear, no updates after the initial refresh, switching back go the
> > Wayland-terminal crashed the machine.
> >
>
> Also, trying to bring the eDP-screen back from DPMS gives me:
>
> <3>[ 2355.218099] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
> <3>[ 2355.218926] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
> <3>[ 2355.262859] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
> <3>[ 2355.263600] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
> <3>[ 2355.305211] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
> <3>[ 2355.305955] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
> <3>[ 2355.345250] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]] *ERROR* set state_bit for link_train=1 failed
> <3>[ 2355.346026] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link training #1 failed. ret=-110
> <3>[ 2355.405650] [drm:dp_display_process_hpd_high [msm]] *ERROR* failed to complete DP link training
> <3>[ 2355.668988] [drm:dpu_encoder_phys_vid_wait_for_commit_done:488] [dpu error]vblank timeout
> <3>[ 2355.669030] [drm:dpu_kms_wait_for_commit_done:510] [dpu error]wait for commit done returned -110
> <3>[ 2355.699989] [drm:dpu_encoder_frame_done_timeout:2398] [dpu error]enc35 frame done timeout
>
> And then the machine just resets.
>

I saw similar behavior on ChromeOS after we picked the PSR patches into
our kernel. I suspect it's the same problem. I switched back and forth
between VT2 and the OOBE screen with ctrl+alt+forward and that showed
what I typed on the virtual terminal after switching back and forth.
It's like the redraw only happens once on the switch and never again. I
switched back and forth enough times that it eventually crashed the
kernel and rebooted. This was on CRD (sc7280-herobrine-crd.dts).

There's an animation on the OOBE screen that is working though, so
perhaps PSR is working with the chrome compositor but not the virtual
terminal? I haven't investigated.

RE: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Vinod Polimera]

> -----Original Message-----
> From: Stephen Boyd <swboyd@chromium.org>
> Sent: Monday, March 27, 2023 9:58 PM
> To: Bjorn Andersson <andersson@kernel.org>; Vinod Polimera (QUIC)
> <quic_vpolimer@quicinc.com>
> Cc: dri-devel@lists.freedesktop.org; linux-arm-msm@vger.kernel.org;
> freedreno@lists.freedesktop.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; robdclark@gmail.com; dianders@chromium.org;
> Kalyan Thota (QUIC) <quic_kalyant@quicinc.com>;
> dmitry.baryshkov@linaro.org; Kuogee Hsieh (QUIC)
> <quic_khsieh@quicinc.com>; Vishnuvardhan Prodduturi (QUIC)
> <quic_vproddut@quicinc.com>; Bjorn Andersson (QUIC)
> <quic_bjorande@quicinc.com>; Abhinav Kumar (QUIC)
> <quic_abhinavk@quicinc.com>; Sankeerth Billakanti (QUIC)
> <quic_sbillaka@quicinc.com>
> Subject: Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based
> on PSR support
>  
> Quoting Bjorn Andersson (2023-03-26 09:35:56)
> > On Sun, Mar 26, 2023 at 09:27:23AM -0700, Bjorn Andersson wrote:
> > > On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > > > For the PSR to kick in, self_refresh_aware has to be set.
> > > > Initialize it based on the PSR support for the eDP interface.
> > > >
> > >
> > > When I boot my sc8280xp devices (CRD and X13s) to console with this
> > > patch included I get a login prompt, and then there are no more screen
> > > updates.
> > >
> > > Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
> > >
> > > Blindly login in and launching Wayland works and from then on screen
> > > updates works as expected.
> > >
> > > Switching from Wayland to another virtual terminal causes the problem
> to
> > > re-appear, no updates after the initial refresh, switching back go the
> > > Wayland-terminal crashed the machine.
> > >
> >
> > Also, trying to bring the eDP-screen back from DPMS gives me:
> >
> > <3>[ 2355.218099] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> *ERROR* set state_bit for link_train=1 failed
> > <3>[ 2355.218926] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> training #1 failed. ret=-110
> > <3>[ 2355.262859] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> *ERROR* set state_bit for link_train=1 failed
> > <3>[ 2355.263600] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> training #1 failed. ret=-110
> > <3>[ 2355.305211] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> *ERROR* set state_bit for link_train=1 failed
> > <3>[ 2355.305955] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> training #1 failed. ret=-110
> > <3>[ 2355.345250] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> *ERROR* set state_bit for link_train=1 failed
> > <3>[ 2355.346026] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> training #1 failed. ret=-110
> > <3>[ 2355.405650] [drm:dp_display_process_hpd_high [msm]] *ERROR*
> failed to complete DP link training
> > <3>[ 2355.668988]
> [drm:dpu_encoder_phys_vid_wait_for_commit_done:488] [dpu
> error]vblank timeout
> > <3>[ 2355.669030] [drm:dpu_kms_wait_for_commit_done:510] [dpu
> error]wait for commit done returned -110
> > <3>[ 2355.699989] [drm:dpu_encoder_frame_done_timeout:2398] [dpu
> error]enc35 frame done timeout
> >
> > And then the machine just resets.
> >
> 
> I saw similar behavior on ChromeOS after we picked the PSR patches into
> our kernel. I suspect it's the same problem. I switched back and forth
> between VT2 and the OOBE screen with ctrl+alt+forward and that showed
> what I typed on the virtual terminal after switching back and forth.
> It's like the redraw only happens once on the switch and never again. I
> switched back and forth enough times that it eventually crashed the
> kernel and rebooted. This was on CRD (sc7280-herobrine-crd.dts).
> 
> There's an animation on the OOBE screen that is working though, so
> perhaps PSR is working with the chrome compositor but not the virtual
> terminal? I haven't investigated.

I was able to reproduce the issue where in virtual terminal, I don't see any screen refresh despite typing in.
In the VT mode, I see that PSR is entered, but despite typing in there are no atomic commits triggered, hence the last buffer was always refreshed.

Queries from my side to Rob & Doug:
1) In VT mode, does the framework operates in single buffer mode without any commit for new updates ?
2) if above is true then, how does driver know if the framework operates in single buffer mode, to make any appropriate action
3) what is the expected behavior with the driver here ? should it return atomic_check failure, for single buffer mode operation or, it should exit PSR ?
4) is there any HINT passed down to the driver so that we can bank on it and act accordingly?

Thanks,
Vinod P.

 

Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Doug Anderson]

Hi,

On Wed, Mar 29, 2023 at 8:16 AM Vinod Polimera
<vpolimer@qti.qualcomm.com> wrote:
>
>
>
> > -----Original Message-----
> > From: Stephen Boyd <swboyd@chromium.org>
> > Sent: Monday, March 27, 2023 9:58 PM
> > To: Bjorn Andersson <andersson@kernel.org>; Vinod Polimera (QUIC)
> > <quic_vpolimer@quicinc.com>
> > Cc: dri-devel@lists.freedesktop.org; linux-arm-msm@vger.kernel.org;
> > freedreno@lists.freedesktop.org; devicetree@vger.kernel.org; linux-
> > kernel@vger.kernel.org; robdclark@gmail.com; dianders@chromium.org;
> > Kalyan Thota (QUIC) <quic_kalyant@quicinc.com>;
> > dmitry.baryshkov@linaro.org; Kuogee Hsieh (QUIC)
> > <quic_khsieh@quicinc.com>; Vishnuvardhan Prodduturi (QUIC)
> > <quic_vproddut@quicinc.com>; Bjorn Andersson (QUIC)
> > <quic_bjorande@quicinc.com>; Abhinav Kumar (QUIC)
> > <quic_abhinavk@quicinc.com>; Sankeerth Billakanti (QUIC)
> > <quic_sbillaka@quicinc.com>
> > Subject: Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based
> > on PSR support
> >
> > Quoting Bjorn Andersson (2023-03-26 09:35:56)
> > > On Sun, Mar 26, 2023 at 09:27:23AM -0700, Bjorn Andersson wrote:
> > > > On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > > > > For the PSR to kick in, self_refresh_aware has to be set.
> > > > > Initialize it based on the PSR support for the eDP interface.
> > > > >
> > > >
> > > > When I boot my sc8280xp devices (CRD and X13s) to console with this
> > > > patch included I get a login prompt, and then there are no more screen
> > > > updates.
> > > >
> > > > Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
> > > >
> > > > Blindly login in and launching Wayland works and from then on screen
> > > > updates works as expected.
> > > >
> > > > Switching from Wayland to another virtual terminal causes the problem
> > to
> > > > re-appear, no updates after the initial refresh, switching back go the
> > > > Wayland-terminal crashed the machine.
> > > >
> > >
> > > Also, trying to bring the eDP-screen back from DPMS gives me:
> > >
> > > <3>[ 2355.218099] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > *ERROR* set state_bit for link_train=1 failed
> > > <3>[ 2355.218926] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > training #1 failed. ret=-110
> > > <3>[ 2355.262859] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > *ERROR* set state_bit for link_train=1 failed
> > > <3>[ 2355.263600] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > training #1 failed. ret=-110
> > > <3>[ 2355.305211] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > *ERROR* set state_bit for link_train=1 failed
> > > <3>[ 2355.305955] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > training #1 failed. ret=-110
> > > <3>[ 2355.345250] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > *ERROR* set state_bit for link_train=1 failed
> > > <3>[ 2355.346026] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > training #1 failed. ret=-110
> > > <3>[ 2355.405650] [drm:dp_display_process_hpd_high [msm]] *ERROR*
> > failed to complete DP link training
> > > <3>[ 2355.668988]
> > [drm:dpu_encoder_phys_vid_wait_for_commit_done:488] [dpu
> > error]vblank timeout
> > > <3>[ 2355.669030] [drm:dpu_kms_wait_for_commit_done:510] [dpu
> > error]wait for commit done returned -110
> > > <3>[ 2355.699989] [drm:dpu_encoder_frame_done_timeout:2398] [dpu
> > error]enc35 frame done timeout
> > >
> > > And then the machine just resets.
> > >
> >
> > I saw similar behavior on ChromeOS after we picked the PSR patches into
> > our kernel. I suspect it's the same problem. I switched back and forth
> > between VT2 and the OOBE screen with ctrl+alt+forward and that showed
> > what I typed on the virtual terminal after switching back and forth.
> > It's like the redraw only happens once on the switch and never again. I
> > switched back and forth enough times that it eventually crashed the
> > kernel and rebooted. This was on CRD (sc7280-herobrine-crd.dts).
> >
> > There's an animation on the OOBE screen that is working though, so
> > perhaps PSR is working with the chrome compositor but not the virtual
> > terminal? I haven't investigated.
>
> I was able to reproduce the issue where in virtual terminal, I don't see any screen refresh despite typing in.
> In the VT mode, I see that PSR is entered, but despite typing in there are no atomic commits triggered, hence the last buffer was always refreshed.
>
> Queries from my side to Rob & Doug:
> 1) In VT mode, does the framework operates in single buffer mode without any commit for new updates ?
> 2) if above is true then, how does driver know if the framework operates in single buffer mode, to make any appropriate action
> 3) what is the expected behavior with the driver here ? should it return atomic_check failure, for single buffer mode operation or, it should exit PSR ?
> 4) is there any HINT passed down to the driver so that we can bank on it and act accordingly?

I haven't looked at this detail about PSR before, and I left my
PSR-enabled device at home so I can't easily test this right now. That
being said, from a bit of searching I would guess that
msm_framebuffer_dirtyfb() is somehow involved here. Are things better
if you get rid of the test against 'msm_fb->dirtyfb'?

I at least used ftrace to confirm that on a different device
msm_framebuffer_dirtyfb() is not called during normal ChromeOS usage
but it _is_ called in VT2 usage.

-Doug

Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Doug Anderson]

Hi,

On Wed, Mar 29, 2023 at 8:47 AM Doug Anderson <dianders@chromium.org> wrote:
>
> Hi,
>
> On Wed, Mar 29, 2023 at 8:16 AM Vinod Polimera
> <vpolimer@qti.qualcomm.com> wrote:
> >
> >
> >
> > > -----Original Message-----
> > > From: Stephen Boyd <swboyd@chromium.org>
> > > Sent: Monday, March 27, 2023 9:58 PM
> > > To: Bjorn Andersson <andersson@kernel.org>; Vinod Polimera (QUIC)
> > > <quic_vpolimer@quicinc.com>
> > > Cc: dri-devel@lists.freedesktop.org; linux-arm-msm@vger.kernel.org;
> > > freedreno@lists.freedesktop.org; devicetree@vger.kernel.org; linux-
> > > kernel@vger.kernel.org; robdclark@gmail.com; dianders@chromium.org;
> > > Kalyan Thota (QUIC) <quic_kalyant@quicinc.com>;
> > > dmitry.baryshkov@linaro.org; Kuogee Hsieh (QUIC)
> > > <quic_khsieh@quicinc.com>; Vishnuvardhan Prodduturi (QUIC)
> > > <quic_vproddut@quicinc.com>; Bjorn Andersson (QUIC)
> > > <quic_bjorande@quicinc.com>; Abhinav Kumar (QUIC)
> > > <quic_abhinavk@quicinc.com>; Sankeerth Billakanti (QUIC)
> > > <quic_sbillaka@quicinc.com>
> > > Subject: Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based
> > > on PSR support
> > >
> > > Quoting Bjorn Andersson (2023-03-26 09:35:56)
> > > > On Sun, Mar 26, 2023 at 09:27:23AM -0700, Bjorn Andersson wrote:
> > > > > On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > > > > > For the PSR to kick in, self_refresh_aware has to be set.
> > > > > > Initialize it based on the PSR support for the eDP interface.
> > > > > >
> > > > >
> > > > > When I boot my sc8280xp devices (CRD and X13s) to console with this
> > > > > patch included I get a login prompt, and then there are no more screen
> > > > > updates.
> > > > >
> > > > > Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
> > > > >
> > > > > Blindly login in and launching Wayland works and from then on screen
> > > > > updates works as expected.
> > > > >
> > > > > Switching from Wayland to another virtual terminal causes the problem
> > > to
> > > > > re-appear, no updates after the initial refresh, switching back go the
> > > > > Wayland-terminal crashed the machine.
> > > > >
> > > >
> > > > Also, trying to bring the eDP-screen back from DPMS gives me:
> > > >
> > > > <3>[ 2355.218099] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > > *ERROR* set state_bit for link_train=1 failed
> > > > <3>[ 2355.218926] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > > training #1 failed. ret=-110
> > > > <3>[ 2355.262859] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > > *ERROR* set state_bit for link_train=1 failed
> > > > <3>[ 2355.263600] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > > training #1 failed. ret=-110
> > > > <3>[ 2355.305211] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > > *ERROR* set state_bit for link_train=1 failed
> > > > <3>[ 2355.305955] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > > training #1 failed. ret=-110
> > > > <3>[ 2355.345250] [drm:dp_catalog_ctrl_set_pattern_state_bit [msm]]
> > > *ERROR* set state_bit for link_train=1 failed
> > > > <3>[ 2355.346026] [drm:dp_ctrl_setup_main_link [msm]] *ERROR* link
> > > training #1 failed. ret=-110
> > > > <3>[ 2355.405650] [drm:dp_display_process_hpd_high [msm]] *ERROR*
> > > failed to complete DP link training
> > > > <3>[ 2355.668988]
> > > [drm:dpu_encoder_phys_vid_wait_for_commit_done:488] [dpu
> > > error]vblank timeout
> > > > <3>[ 2355.669030] [drm:dpu_kms_wait_for_commit_done:510] [dpu
> > > error]wait for commit done returned -110
> > > > <3>[ 2355.699989] [drm:dpu_encoder_frame_done_timeout:2398] [dpu
> > > error]enc35 frame done timeout
> > > >
> > > > And then the machine just resets.
> > > >
> > >
> > > I saw similar behavior on ChromeOS after we picked the PSR patches into
> > > our kernel. I suspect it's the same problem. I switched back and forth
> > > between VT2 and the OOBE screen with ctrl+alt+forward and that showed
> > > what I typed on the virtual terminal after switching back and forth.
> > > It's like the redraw only happens once on the switch and never again. I
> > > switched back and forth enough times that it eventually crashed the
> > > kernel and rebooted. This was on CRD (sc7280-herobrine-crd.dts).
> > >
> > > There's an animation on the OOBE screen that is working though, so
> > > perhaps PSR is working with the chrome compositor but not the virtual
> > > terminal? I haven't investigated.
> >
> > I was able to reproduce the issue where in virtual terminal, I don't see any screen refresh despite typing in.
> > In the VT mode, I see that PSR is entered, but despite typing in there are no atomic commits triggered, hence the last buffer was always refreshed.
> >
> > Queries from my side to Rob & Doug:
> > 1) In VT mode, does the framework operates in single buffer mode without any commit for new updates ?
> > 2) if above is true then, how does driver know if the framework operates in single buffer mode, to make any appropriate action
> > 3) what is the expected behavior with the driver here ? should it return atomic_check failure, for single buffer mode operation or, it should exit PSR ?
> > 4) is there any HINT passed down to the driver so that we can bank on it and act accordingly?
>
> I haven't looked at this detail about PSR before, and I left my
> PSR-enabled device at home so I can't easily test this right now. That
> being said, from a bit of searching I would guess that
> msm_framebuffer_dirtyfb() is somehow involved here. Are things better
> if you get rid of the test against 'msm_fb->dirtyfb'?
>
> I at least used ftrace to confirm that on a different device
> msm_framebuffer_dirtyfb() is not called during normal ChromeOS usage
> but it _is_ called in VT2 usage.

Indeed, I can confirm that if I comment out the test in
msm_framebuffer_dirtyfb() and just call straight through to
drm_atomic_helper_dirtyfb() that typing on VT2 works fine.

...so presumably you need to figure out how to get "dirtyfb" set
properly when you have a PSR-enabled panel or maybe whenever the panel
enters PSR mode?

-Doug

RE: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Vinod Polimera]

> -----Original Message-----
> From: Doug Anderson <dianders@chromium.org>
> Sent: Thursday, March 30, 2023 7:54 PM
> To: Vinod Polimera <vpolimer@qti.qualcomm.com>
> Cc: Stephen Boyd <swboyd@chromium.org>; Bjorn Andersson
> <andersson@kernel.org>; Vinod Polimera (QUIC)
> <quic_vpolimer@quicinc.com>; robdclark@gmail.com; dri-
> devel@lists.freedesktop.org; linux-arm-msm@vger.kernel.org;
> freedreno@lists.freedesktop.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; Kalyan Thota (QUIC) <quic_kalyant@quicinc.com>;
> dmitry.baryshkov@linaro.org; Kuogee Hsieh (QUIC)
> <quic_khsieh@quicinc.com>; Vishnuvardhan Prodduturi (QUIC)
> <quic_vproddut@quicinc.com>; Bjorn Andersson (QUIC)
> <quic_bjorande@quicinc.com>; Abhinav Kumar (QUIC)
> <quic_abhinavk@quicinc.com>; Sankeerth Billakanti (QUIC)
> <quic_sbillaka@quicinc.com>
> Subject: Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based
> on PSR support
> 
> 
> Hi,
> 
> On Wed, Mar 29, 2023 at 8:47 AM Doug Anderson
> <dianders@chromium.org> wrote:
> >
> > Hi,
> >
> > On Wed, Mar 29, 2023 at 8:16 AM Vinod Polimera
> > <vpolimer@qti.qualcomm.com> wrote:
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: Stephen Boyd <swboyd@chromium.org>
> > > > Sent: Monday, March 27, 2023 9:58 PM
> > > > To: Bjorn Andersson <andersson@kernel.org>; Vinod Polimera (QUIC)
> > > > <quic_vpolimer@quicinc.com>
> > > > Cc: dri-devel@lists.freedesktop.org; linux-arm-msm@vger.kernel.org;
> > > > freedreno@lists.freedesktop.org; devicetree@vger.kernel.org; linux-
> > > > kernel@vger.kernel.org; robdclark@gmail.com;
> dianders@chromium.org;
> > > > Kalyan Thota (QUIC) <quic_kalyant@quicinc.com>;
> > > > dmitry.baryshkov@linaro.org; Kuogee Hsieh (QUIC)
> > > > <quic_khsieh@quicinc.com>; Vishnuvardhan Prodduturi (QUIC)
> > > > <quic_vproddut@quicinc.com>; Bjorn Andersson (QUIC)
> > > > <quic_bjorande@quicinc.com>; Abhinav Kumar (QUIC)
> > > > <quic_abhinavk@quicinc.com>; Sankeerth Billakanti (QUIC)
> > > > <quic_sbillaka@quicinc.com>
> > > > Subject: Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware
> based
> > > > on PSR support
> > > >
> > > > Quoting Bjorn Andersson (2023-03-26 09:35:56)
> > > > > On Sun, Mar 26, 2023 at 09:27:23AM -0700, Bjorn Andersson wrote:
> > > > > > On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > > > > > > For the PSR to kick in, self_refresh_aware has to be set.
> > > > > > > Initialize it based on the PSR support for the eDP interface.
> > > > > > >
> > > > > >
> > > > > > When I boot my sc8280xp devices (CRD and X13s) to console with
> this
> > > > > > patch included I get a login prompt, and then there are no more
> screen
> > > > > > updates.
> > > > > >
> > > > > > Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
> > > > > >
> > > > > > Blindly login in and launching Wayland works and from then on
> screen
> > > > > > updates works as expected.
> > > > > >
> > > > > > Switching from Wayland to another virtual terminal causes the
> problem
> > > > to
> > > > > > re-appear, no updates after the initial refresh, switching back go the
> > > > > > Wayland-terminal crashed the machine.
> > > > > >
> > > > >
> > > > > Also, trying to bring the eDP-screen back from DPMS gives me:
> > > > >
> > > > > <3>[ 2355.218099] [drm:dp_catalog_ctrl_set_pattern_state_bit
> [msm]]
> > > > *ERROR* set state_bit for link_train=1 failed
> > > > > <3>[ 2355.218926] [drm:dp_ctrl_setup_main_link [msm]] *ERROR*
> link
> > > > training #1 failed. ret=-110
> > > > > <3>[ 2355.262859] [drm:dp_catalog_ctrl_set_pattern_state_bit
> [msm]]
> > > > *ERROR* set state_bit for link_train=1 failed
> > > > > <3>[ 2355.263600] [drm:dp_ctrl_setup_main_link [msm]] *ERROR*
> link
> > > > training #1 failed. ret=-110
> > > > > <3>[ 2355.305211] [drm:dp_catalog_ctrl_set_pattern_state_bit
> [msm]]
> > > > *ERROR* set state_bit for link_train=1 failed
> > > > > <3>[ 2355.305955] [drm:dp_ctrl_setup_main_link [msm]] *ERROR*
> link
> > > > training #1 failed. ret=-110
> > > > > <3>[ 2355.345250] [drm:dp_catalog_ctrl_set_pattern_state_bit
> [msm]]
> > > > *ERROR* set state_bit for link_train=1 failed
> > > > > <3>[ 2355.346026] [drm:dp_ctrl_setup_main_link [msm]] *ERROR*
> link
> > > > training #1 failed. ret=-110
> > > > > <3>[ 2355.405650] [drm:dp_display_process_hpd_high [msm]]
> *ERROR*
> > > > failed to complete DP link training
> > > > > <3>[ 2355.668988]
> > > > [drm:dpu_encoder_phys_vid_wait_for_commit_done:488] [dpu
> > > > error]vblank timeout
> > > > > <3>[ 2355.669030] [drm:dpu_kms_wait_for_commit_done:510] [dpu
> > > > error]wait for commit done returned -110
> > > > > <3>[ 2355.699989] [drm:dpu_encoder_frame_done_timeout:2398]
> [dpu
> > > > error]enc35 frame done timeout
> > > > >
> > > > > And then the machine just resets.
> > > > >
> > > >
> > > > I saw similar behavior on ChromeOS after we picked the PSR patches
> into
> > > > our kernel. I suspect it's the same problem. I switched back and forth
> > > > between VT2 and the OOBE screen with ctrl+alt+forward and that
> showed
> > > > what I typed on the virtual terminal after switching back and forth.
> > > > It's like the redraw only happens once on the switch and never again. I
> > > > switched back and forth enough times that it eventually crashed the
> > > > kernel and rebooted. This was on CRD (sc7280-herobrine-crd.dts).
> > > >
> > > > There's an animation on the OOBE screen that is working though, so
> > > > perhaps PSR is working with the chrome compositor but not the virtual
> > > > terminal? I haven't investigated.
> > >
> > > I was able to reproduce the issue where in virtual terminal, I don't see
> any screen refresh despite typing in.
> > > In the VT mode, I see that PSR is entered, but despite typing in there are
> no atomic commits triggered, hence the last buffer was always refreshed.
> > >
> > > Queries from my side to Rob & Doug:
> > > 1) In VT mode, does the framework operates in single buffer mode
> without any commit for new updates ?
> > > 2) if above is true then, how does driver know if the framework operates
> in single buffer mode, to make any appropriate action
> > > 3) what is the expected behavior with the driver here ? should it return
> atomic_check failure, for single buffer mode operation or, it should exit PSR ?
> > > 4) is there any HINT passed down to the driver so that we can bank on it
> and act accordingly?
> >
> > I haven't looked at this detail about PSR before, and I left my
> > PSR-enabled device at home so I can't easily test this right now. That
> > being said, from a bit of searching I would guess that
> > msm_framebuffer_dirtyfb() is somehow involved here. Are things better
> > if you get rid of the test against 'msm_fb->dirtyfb'?
> >
> > I at least used ftrace to confirm that on a different device
> > msm_framebuffer_dirtyfb() is not called during normal ChromeOS usage
> > but it _is_ called in VT2 usage.
> 
> Indeed, I can confirm that if I comment out the test in
> msm_framebuffer_dirtyfb() and just call straight through to
> drm_atomic_helper_dirtyfb() that typing on VT2 works fine.
> 
> ...so presumably you need to figure out how to get "dirtyfb" set
> properly when you have a PSR-enabled panel or maybe whenever the panel
> enters PSR mode?
> 
I have also observed the same and I am working on fixing it.

Thanks,
Vinod P.

> -Doug

Re: [PATCH v14 14/14] drm/msm/dp: set self refresh aware based on PSR support

[Dmitry Baryshkov]

On Sun, 26 Mar 2023 at 19:24, Bjorn Andersson <andersson@kernel.org> wrote:
>
> On Thu, Mar 02, 2023 at 10:03:17PM +0530, Vinod Polimera wrote:
> > For the PSR to kick in, self_refresh_aware has to be set.
> > Initialize it based on the PSR support for the eDP interface.
> >
>
> When I boot my sc8280xp devices (CRD and X13s) to console with this
> patch included I get a login prompt, and then there are no more screen
> updates.
>
> Switching virtual terminal (ctrl+alt+fN) causes the screen to redraw.
>
> Blindly login in and launching Wayland works and from then on screen
> updates works as expected.
>
> Switching from Wayland to another virtual terminal causes the problem to
> re-appear, no updates after the initial refresh, switching back go the
> Wayland-terminal crashed the machine.
>
>
>
> Reverting this single patch resolves both the issue with the console
> updating as exected and flipping between the virtual terminal with
> Wayland and the others no longer crashes my machine.

I hope Vinod Polimera can assist in solving the issue. In the worst
case we will have to revert this commit, shortcutting the PSR until it
is properly debugged.

>
> Regards,
> Bjorn
>
> > Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> > ---
> >  drivers/gpu/drm/msm/dp/dp_drm.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> > index 029e08c..785d766 100644
> > --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> > +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> > @@ -117,6 +117,8 @@ static int edp_bridge_atomic_check(struct drm_bridge *drm_bridge,
> >       if (WARN_ON(!conn_state))
> >               return -ENODEV;
> >
> > +     conn_state->self_refresh_aware = dp->psr_supported;
> > +
> >       if (!conn_state->crtc || !crtc_state)
> >               return 0;
> >
> > --
> > 2.7.4
> >



-- 
With best wishes
Dmitry

Re: [PATCH v14 00/14] Add PSR support for eDP

[Doug Anderson]

Hi,

On Thu, Mar 2, 2023 at 8:33 AM Vinod Polimera <quic_vpolimer@quicinc.com> wrote:
>
> Changes in v2:
>   - Use dp bridge to set psr entry/exit instead of dpu_enocder.
>   - Don't modify whitespaces.
>   - Set self refresh aware from atomic_check.
>   - Set self refresh aware only if psr is supported.
>   - Provide a stub for msm_dp_display_set_psr.
>   - Move dp functions to bridge code.
>
> Changes in v3:
>   - Change callback names to reflect atomic interfaces.
>   - Move bridge callback change to separate patch as suggested by Dmitry.
>   - Remove psr function declaration from msm_drv.h.
>   - Set self_refresh_aware flag only if psr is supported.
>   - Modify the variable names to simpler form.
>   - Define bit fields for PSR settings.
>   - Add comments explaining the steps to enter/exit psr.
>   - Change DRM_INFO to drm_dbg_db.
>
> Changes in v4:
>   - Move the get crtc functions to drm_atomic.
>   - Add atomic functions for DP bridge too.
>   - Add ternary operator to choose eDP or DP ops.
>   - Return true/false instead of 1/0.
>   - mode_valid missing in the eDP bridge ops.
>   - Move the functions to get crtc into drm_atomic.c.
>   - Fix compilation issues.
>   - Remove dpu_assign_crtc and get crtc from drm_enc instead of dpu_enc.
>   - Check for crtc state enable while reserving resources.
>
> Changes in v5:
>   - Move the mode_valid changes into a different patch.
>   - Complete psr_op_comp only when isr is set.
>   - Move the DP atomic callback changes to a different patch.
>   - Get crtc from drm connector state crtc.
>   - Move to separate patch for check for crtc state enable while
> reserving resources.
>
> Changes in v6:
>   - Remove crtc from dpu_encoder_virt struct.
>   - fix crtc check during vblank toggle crtc.
>   - Misc changes.
>
> Changes in v7:
>   - Add fix for underrun issue on kasan build.
>
> Changes in v8:
>   - Drop the enc spinlock as it won't serve any purpose in
> protetcing conn state.(Dmitry/Doug)
>
> Changes in v9:
>   - Update commit message and fix alignment using spaces.(Marijn)
>   - Misc changes.(Marijn)
>
> Changes in v10:
>   - Get crtc cached in dpu_enc during obj init.(Dmitry)
>
> Changes in v11:
>   - Remove crtc cached in dpu_enc during obj init.
>   - Update dpu_enc crtc state on crtc enable/disable during self refresh.
>
> Changes in v12:
>   - Update sc7180 intf mask to get intf timing gen status
> based on DPU_INTF_STATUS_SUPPORTED bit.(Dmitry)
>   - Remove "clear active interface in the datapath cleanup" change
> as it is already included.
>
> Changes in v13:
>   - Move core changes to top of the series.(Dmitry)
>   - Drop self refresh aware disable change after psr entry.(Dmitry)
>
> Changes in v14:
>   - Set self_refresh_aware for the PSR to kick in.
>
> Vinod Polimera (14):
>   drm: add helper functions to retrieve old and new crtc
>   drm/bridge: use atomic enable/disable callbacks for panel bridge
>   drm/bridge: add psr support for panel bridge callbacks
>   drm/msm/disp/dpu: check for crtc enable rather than crtc active to
>     release shared resources
>   drm/msm/disp/dpu: get timing engine status from intf status register
>   drm/msm/disp/dpu: wait for extra vsync till timing engine status is
>     disabled
>   drm/msm/disp/dpu: reset the datapath after timing engine disable
>   drm/msm/dp: use atomic callbacks for DP bridge ops
>   drm/msm/dp: Add basic PSR support for eDP
>   drm/msm/dp: use the eDP bridge ops to validate eDP modes
>   drm/msm/disp/dpu: use atomic enable/disable callbacks for encoder
>     functions
>   drm/msm/disp/dpu: add PSR support for eDP interface in dpu driver
>   drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable
>     during self refresh
>   drm/msm/dp: set self refresh aware based on psr support
>
>  drivers/gpu/drm/bridge/panel.c                     |  68 +++++++-
>  drivers/gpu/drm/drm_atomic.c                       |  60 +++++++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c           |  40 ++++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        |  26 +++-
>  .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   |  22 +++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c     |   3 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h     |  12 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        |   8 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c            |   2 +-
>  drivers/gpu/drm/msm/dp/dp_catalog.c                |  80 ++++++++++
>  drivers/gpu/drm/msm/dp/dp_catalog.h                |   4 +
>  drivers/gpu/drm/msm/dp/dp_ctrl.c                   |  80 ++++++++++
>  drivers/gpu/drm/msm/dp/dp_ctrl.h                   |   3 +
>  drivers/gpu/drm/msm/dp/dp_display.c                |  36 +++--
>  drivers/gpu/drm/msm/dp/dp_display.h                |   2 +
>  drivers/gpu/drm/msm/dp/dp_drm.c                    | 173 ++++++++++++++++++++-
>  drivers/gpu/drm/msm/dp/dp_drm.h                    |   9 +-
>  drivers/gpu/drm/msm/dp/dp_link.c                   |  36 +++++
>  drivers/gpu/drm/msm/dp/dp_panel.c                  |  22 +++
>  drivers/gpu/drm/msm/dp/dp_panel.h                  |   6 +
>  drivers/gpu/drm/msm/dp/dp_reg.h                    |  27 ++++
>  include/drm/drm_atomic.h                           |   7 +
>  22 files changed, 683 insertions(+), 43 deletions(-)

I put these patches on top of msm-next. With that, I was at least able
to see the PSR transition function being called by:

echo "dp_catalog_ctrl_set_psr" > /sys/kernel/debug/tracing/set_ftrace_filter
echo function > /sys/kernel/debug/tracing/current_tracer
echo 1 > /sys/kernel/debug/tracing/tracing_on
cat /sys/kernel/debug/tracing/trace_pipe

I didn't do anything to actually confirm that the panel was in PSR
mode nor that power savings are happening, but at least I can confirm
that the function is being called again (AKA the fix from v13 to v14
seems to have worked).

---

I also backported these to chromeos-5.15 and let a hoglin device sit
there on my desk for a few hours with the cursor blinking to see if I
could see any of the "flickers" that I saw before. I was running a
KASAN build and forcing cpus to the lowest frequencies:

echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq > \
    /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

echo userspace > /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_min_freq > \
    /sys/devices/system/cpu/cpu4/cpufreq/scaling_setspeed

echo userspace > /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu7/cpufreq/cpuinfo_min_freq > \
    /sys/devices/system/cpu/cpu7/cpufreq/scaling_setspeed

I did manage to see the screen flicker once over a period of an hour
or two. That's not terribly surprising because of the changes in v13
which dropped your previous fix for this. I'll look forward to seeing
a future patch to fix this in the core.

---

In any case, with all the caveats mentioned above, I'm OK with:

Tested-by: Douglas Anderson <dianders@chromium.org>

Re: [PATCH v14 00/14] Add PSR support for eDP

[Dmitry Baryshkov]

David, Daniel & other drm maintainers,

On 02/03/2023 18:33, Vinod Polimera wrote:

[skipped the changelog]

> Vinod Polimera (14):
>    drm: add helper functions to retrieve old and new crtc
>    drm/bridge: use atomic enable/disable callbacks for panel bridge
>    drm/bridge: add psr support for panel bridge callbacks

The first three patches are generic. How do we merge this series? I 
think these three patches should be merged into an immutable branch at 
drm-misc (or any other drm tree), which we can then merge into msm-next. 
What do you think?

>    drm/msm/disp/dpu: check for crtc enable rather than crtc active to
>      release shared resources
>    drm/msm/disp/dpu: get timing engine status from intf status register
>    drm/msm/disp/dpu: wait for extra vsync till timing engine status is
>      disabled
>    drm/msm/disp/dpu: reset the datapath after timing engine disable
>    drm/msm/dp: use atomic callbacks for DP bridge ops
>    drm/msm/dp: Add basic PSR support for eDP
>    drm/msm/dp: use the eDP bridge ops to validate eDP modes
>    drm/msm/disp/dpu: use atomic enable/disable callbacks for encoder
>      functions
>    drm/msm/disp/dpu: add PSR support for eDP interface in dpu driver
>    drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable
>      during self refresh
>    drm/msm/dp: set self refresh aware based on psr support
> 
>   drivers/gpu/drm/bridge/panel.c                     |  68 +++++++-
>   drivers/gpu/drm/drm_atomic.c                       |  60 +++++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c           |  40 ++++-
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        |  26 +++-
>   .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   |  22 +++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c     |   3 +-
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h     |  12 +-
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c        |   8 +-
>   drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c            |   2 +-
>   drivers/gpu/drm/msm/dp/dp_catalog.c                |  80 ++++++++++
>   drivers/gpu/drm/msm/dp/dp_catalog.h                |   4 +
>   drivers/gpu/drm/msm/dp/dp_ctrl.c                   |  80 ++++++++++
>   drivers/gpu/drm/msm/dp/dp_ctrl.h                   |   3 +
>   drivers/gpu/drm/msm/dp/dp_display.c                |  36 +++--
>   drivers/gpu/drm/msm/dp/dp_display.h                |   2 +
>   drivers/gpu/drm/msm/dp/dp_drm.c                    | 173 ++++++++++++++++++++-
>   drivers/gpu/drm/msm/dp/dp_drm.h                    |   9 +-
>   drivers/gpu/drm/msm/dp/dp_link.c                   |  36 +++++
>   drivers/gpu/drm/msm/dp/dp_panel.c                  |  22 +++
>   drivers/gpu/drm/msm/dp/dp_panel.h                  |   6 +
>   drivers/gpu/drm/msm/dp/dp_reg.h                    |  27 ++++
>   include/drm/drm_atomic.h                           |   7 +
>   22 files changed, 683 insertions(+), 43 deletions(-)
> 

-- 
With best wishes
Dmitry

Re: [PATCH v14 00/14] Add PSR support for eDP

[Dmitry Baryshkov]

On Thu, 02 Mar 2023 22:03:03 +0530, Vinod Polimera wrote:
> Changes in v2:
>   - Use dp bridge to set psr entry/exit instead of dpu_enocder.
>   - Don't modify whitespaces.
>   - Set self refresh aware from atomic_check.
>   - Set self refresh aware only if psr is supported.
>   - Provide a stub for msm_dp_display_set_psr.
>   - Move dp functions to bridge code.
> 
> [...]

Applied, thanks!

[01/14] drm: add helper functions to retrieve old and new crtc
        https://gitlab.freedesktop.org/lumag/msm/-/commit/ef708af6054c
[02/14] drm/bridge: use atomic enable/disable callbacks for panel bridge
        https://gitlab.freedesktop.org/lumag/msm/-/commit/49291dbf1cd8
[03/14] drm/bridge: add psr support for panel bridge callbacks
        https://gitlab.freedesktop.org/lumag/msm/-/commit/26966d5bc7dd
[04/14] drm/msm/disp/dpu: check for crtc enable rather than crtc active to release shared resources
        https://gitlab.freedesktop.org/lumag/msm/-/commit/c235a0d4a185
[05/14] drm/msm/disp/dpu: get timing engine status from intf status register
        https://gitlab.freedesktop.org/lumag/msm/-/commit/15b04e280119
[06/14] drm/msm/disp/dpu: wait for extra vsync till timing engine status is disabled
        https://gitlab.freedesktop.org/lumag/msm/-/commit/b2afc29853c3
[07/14] drm/msm/disp/dpu: reset the datapath after timing engine disable
        https://gitlab.freedesktop.org/lumag/msm/-/commit/392a21678a7f
[08/14] drm/msm/dp: use atomic callbacks for DP bridge ops
        https://gitlab.freedesktop.org/lumag/msm/-/commit/20536d1c512b
[09/14] drm/msm/dp: Add basic PSR support for eDP
        https://gitlab.freedesktop.org/lumag/msm/-/commit/c0b993bbfe9e
[10/14] drm/msm/dp: use the eDP bridge ops to validate eDP modes
        https://gitlab.freedesktop.org/lumag/msm/-/commit/de9512e23adc
[11/14] drm/msm/disp/dpu: use atomic enable/disable callbacks for encoder functions
        https://gitlab.freedesktop.org/lumag/msm/-/commit/f62087459d8a
[12/14] drm/msm/disp/dpu: add PSR support for eDP interface in dpu driver
        https://gitlab.freedesktop.org/lumag/msm/-/commit/1bd583580cba
[13/14] drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable during self refresh
        https://gitlab.freedesktop.org/lumag/msm/-/commit/0f2a8f000c21
[14/14] drm/msm/dp: set self refresh aware based on PSR support
        https://gitlab.freedesktop.org/lumag/msm/-/commit/0c3f3cfd8ef2

Best regards,
-- 
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>