[PATCHv4 0/6] omapdrm: DSI command mode panel support

[PATCHv4 0/6] omapdrm: DSI command mode panel support

[Sebastian Reichel]

Hi,

It's time for a new revision of the DSI command mode panel
patchset. The patches have been rebased to 4.20-rc1 + fixes
from Laurent and Tony. I dropped the patches for OMAP3 support
(it needs a workaround for a hardware bug) and for automatic
display rotation. They should get their own series, once this
patchset has landed.

Tested on Droid 4:
 * Framebuffer Console, updated at 1Hz due to blinking cursor
 * Display blanking
 * Xorg 1.19 with modesetting driver
 * Weston 5.0 with DRM backend
 * kmstest (static image)
 * No updates send when nothing needs to be sent

Known issues:
 * OMAP3 is untested and most likely broken due to missing
   workaround(s) for hardware bugs.
 * Weston 5.0 with fbdev backend does not work, since it
   uses neither page flip nor dirty ioctl. You need to use
   the drm backend.

Changes since PATCHv3:
 * Drop all Tested/Acked-by tags
 * Drop the rotation patches for now
 * Rebase to 4.20-rc1 + fixes from Laurent and Tony
 * Add fixes for DSI regressions introduced in 4.20-rc1
 * Store info update manual update mode in omap_crtc_state
 * Lock modesetting in omap_framebuffer_dirty
 * Directly loop through CRTCs instead of connectors in dirty function
 * Properly refresh display during page flips and get Weston working
 * Add more comments about implementation details

Changes since PATCHv2:
 * Drop omap3 quirk patch (OMAP3 should get its own mini-series)
 * Rebase to current linux-next
 * Use existing 'rotation' DT property to set DRM orientation hint
 * Add Tested-by from Tony

Changes since PATCHv1:
 * Drop patches, that were queued by Tomi
 * Rebase to current master
 * Rework the omap3 workaround patch to only affect omap3
 * Add orientation DRM property support

-- Sebastian

Sebastian Reichel (6):
  drm/omap: use DRM_DEBUG_DRIVER instead of CORE
  drm/omap: populate DSI platform bus earlier
  drm/omap: don't check dispc timings for DSI
  drm/omap: fix incorrect union usage
  drm/omap: add framedone interrupt support
  drm/omap: add support for manually updated displays

 drivers/gpu/drm/omapdrm/dss/dsi.c        |  20 +--
 drivers/gpu/drm/omapdrm/omap_connector.c |   8 +-
 drivers/gpu/drm/omapdrm/omap_crtc.c      | 166 ++++++++++++++++++++++-
 drivers/gpu/drm/omapdrm/omap_crtc.h      |   2 +
 drivers/gpu/drm/omapdrm/omap_drv.h       |   4 +-
 drivers/gpu/drm/omapdrm/omap_encoder.c   |  16 ++-
 drivers/gpu/drm/omapdrm/omap_fb.c        |  41 ++++++
 drivers/gpu/drm/omapdrm/omap_irq.c       |  25 ++++
 drivers/gpu/drm/omapdrm/omap_irq.h       |   1 +
 9 files changed, 260 insertions(+), 23 deletions(-)

-- 
2.19.1

[PATCHv4 1/6] drm/omap: use DRM_DEBUG_DRIVER instead of CORE

[Sebastian Reichel]

This macro is only used by omapdrm, which should print
debug messages using the DRIVER category instead of the
default CORE category.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/omapdrm/omap_drv.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.h b/drivers/gpu/drm/omapdrm/omap_drv.h
index bd7f2c227a25..3b4af517c92b 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.h
+++ b/drivers/gpu/drm/omapdrm/omap_drv.h
@@ -38,8 +38,8 @@
 #include "omap_irq.h"
 #include "omap_plane.h"
 
-#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
-#define VERB(fmt, ...) if (0) DRM_DEBUG(fmt, ##__VA_ARGS__) /* verbose debug */
+#define DBG(fmt, ...) DRM_DEBUG_DRIVER(fmt"\n", ##__VA_ARGS__)
+#define VERB(fmt, ...) if (0) DRM_DEBUG_DRIVER(fmt, ##__VA_ARGS__) /* verbose debug */
 
 #define MODULE_NAME     "omapdrm"
 
-- 
2.19.1

[PATCHv4 2/6] drm/omap: populate DSI platform bus earlier

[Sebastian Reichel]

After the changes from 4.20 the DSI encoder tries to find the
attached panel before populating the DSI bus. If the panel is
not found -EPROBE_DEFER is returned, so the DSI bus is never
populated and the panel never added.

Fix this by populating the DSI bus before searching for the
video sink in dsi_init_output().

Fixes: 27d624527d992 ("drm/omap: dss: Acquire next dssdev at probe time")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/omapdrm/dss/dsi.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 0a485c5b982e..00a9c2ab9e6c 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -5418,9 +5418,15 @@ static int dsi_probe(struct platform_device *pdev)
 		dsi->num_lanes_supported = 3;
 	}
 
+	r = of_platform_populate(dev->of_node, NULL, NULL, dev);
+	if (r) {
+		DSSERR("Failed to populate DSI child devices: %d\n", r);
+		goto err_pm_disable;
+	}
+
 	r = dsi_init_output(dsi);
 	if (r)
-		goto err_pm_disable;
+		goto err_of_depopulate;
 
 	r = dsi_probe_of(dsi);
 	if (r) {
@@ -5428,22 +5434,16 @@ static int dsi_probe(struct platform_device *pdev)
 		goto err_uninit_output;
 	}
 
-	r = of_platform_populate(dev->of_node, NULL, NULL, dev);
-	if (r) {
-		DSSERR("Failed to populate DSI child devices: %d\n", r);
-		goto err_uninit_output;
-	}
-
 	r = component_add(&pdev->dev, &dsi_component_ops);
 	if (r)
-		goto err_of_depopulate;
+		goto err_uninit_output;
 
 	return 0;
 
-err_of_depopulate:
-	of_platform_depopulate(dev);
 err_uninit_output:
 	dsi_uninit_output(dsi);
+err_of_depopulate:
+	of_platform_depopulate(dev);
 err_pm_disable:
 	pm_runtime_disable(dev);
 	return r;
-- 
2.19.1

[PATCHv4 3/6] drm/omap: don't check dispc timings for DSI

[Sebastian Reichel]

While all display types only forward their VM to the DISPC, this
is not true for DSI. DSI calculates the VM for DISPC based on its
own, but its not identical. Actually the DSI VM is not even a valid
DISPC VM making this check fail. Let's restore the old behaviour
and avoid checking the DISPC VM for DSI here.

Fixes: 7c27fa57ef31 ("drm/omap: Call dispc timings check operation directly")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/omapdrm/omap_connector.c | 8 +++++---
 drivers/gpu/drm/omapdrm/omap_encoder.c   | 8 +++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_connector.c b/drivers/gpu/drm/omapdrm/omap_connector.c
index b81302c4bf9e..5c776d6211e1 100644
--- a/drivers/gpu/drm/omapdrm/omap_connector.c
+++ b/drivers/gpu/drm/omapdrm/omap_connector.c
@@ -280,9 +280,11 @@ static int omap_connector_mode_valid(struct drm_connector *connector,
 	drm_display_mode_to_videomode(mode, &vm);
 	mode->vrefresh = drm_mode_vrefresh(mode);
 
-	r = priv->dispc_ops->mgr_check_timings(priv->dispc, channel, &vm);
-	if (r)
-		goto done;
+	if (omap_connector->display->type != OMAP_DISPLAY_TYPE_DSI) {
+		r = priv->dispc_ops->mgr_check_timings(priv->dispc, channel, &vm);
+		if (r)
+			goto done;
+	}
 
 	for (dssdev = omap_connector->output; dssdev; dssdev = dssdev->next) {
 		if (!dssdev->ops->check_timings)
diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
index 452e625f6ce3..32bbe3a80e7d 100644
--- a/drivers/gpu/drm/omapdrm/omap_encoder.c
+++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
@@ -170,9 +170,11 @@ static int omap_encoder_atomic_check(struct drm_encoder *encoder,
 
 	drm_display_mode_to_videomode(&crtc_state->mode, &vm);
 
-	ret = priv->dispc_ops->mgr_check_timings(priv->dispc, channel, &vm);
-	if (ret)
-		goto done;
+	if (omap_encoder->display->type != OMAP_DISPLAY_TYPE_DSI) {
+		ret = priv->dispc_ops->mgr_check_timings(priv->dispc, channel, &vm);
+		if (ret)
+			goto done;
+	}
 
 	for (dssdev = omap_encoder->output; dssdev; dssdev = dssdev->next) {
 		if (!dssdev->ops->check_timings)
-- 
2.19.1

[PATCHv4 4/6] drm/omap: fix incorrect union usage

[Sebastian Reichel]

The DSI encoder sets dssdev->ops->dsi.set_config, which is stored at the
same offset as dssdev->ops->hdmi.set_hdmi_mode. The code in omap_encoder
only checks if dssdev->ops->hdmi.set_hdmi_mode is NULL. Due to the way
union works, it won't be NULL if dsi.set_config is set. This means
dsi_set_config will be called with config=hdmi_mode=false=NULL parameter
resulting in a NULL dereference. Also the dereference happens while
console is locked, so kernel hangs without any debug output (can be
avoided by fbmem's lockless_register_fb=1 parameter).

This fixes the issue by exiting early if the output type definitely
has no hdmi_set operations.

Fixes: 83910ad3f51fb ("drm/omap: Move most omap_dss_driver operations to omap_dss_device_ops")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/omapdrm/omap_encoder.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
index 32bbe3a80e7d..ba0099f0644c 100644
--- a/drivers/gpu/drm/omapdrm/omap_encoder.c
+++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
@@ -122,6 +122,14 @@ static void omap_encoder_mode_set(struct drm_encoder *encoder,
 
 	dssdev = omap_encoder->output;
 
+	/* The following operations access dssdev->ops->hdmi, which is a union
+	 * also used by DSI. This ensures, that the field does not have data
+	 * for DSI (or any other future output type).
+	 */
+	if (dssdev->output_type != OMAP_DISPLAY_TYPE_HDMI &&
+	    dssdev->output_type != OMAP_DISPLAY_TYPE_DVI)
+		return;
+
 	if (dssdev->ops->hdmi.set_hdmi_mode)
 		dssdev->ops->hdmi.set_hdmi_mode(dssdev, hdmi_mode);
 
-- 
2.19.1

[PATCHv4 5/6] drm/omap: add framedone interrupt support

[Sebastian Reichel]

This prepares framedone interrupt handling for
manual display update support.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/omapdrm/omap_crtc.c | 50 +++++++++++++++++++++++++++++
 drivers/gpu/drm/omapdrm/omap_crtc.h |  1 +
 drivers/gpu/drm/omapdrm/omap_irq.c  | 25 +++++++++++++++
 drivers/gpu/drm/omapdrm/omap_irq.h  |  1 +
 4 files changed, 77 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index caffc547ef97..59ee2399f2e9 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -52,6 +52,9 @@ struct omap_crtc {
 	bool pending;
 	wait_queue_head_t pending_wait;
 	struct drm_pending_vblank_event *event;
+
+	void (*framedone_handler)(void *);
+	void *framedone_handler_data;
 };
 
 /* -----------------------------------------------------------------------------
@@ -231,6 +234,18 @@ static int omap_crtc_dss_register_framedone(
 		struct omap_drm_private *priv, enum omap_channel channel,
 		void (*handler)(void *), void *data)
 {
+	struct drm_crtc *crtc = priv->channels[channel]->crtc;
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct drm_device *dev = omap_crtc->base.dev;
+
+	if (omap_crtc->framedone_handler)
+		return -EBUSY;
+
+	dev_dbg(dev->dev, "register framedone %s", omap_crtc->name);
+
+	omap_crtc->framedone_handler = handler;
+	omap_crtc->framedone_handler_data = data;
+
 	return 0;
 }
 
@@ -238,6 +253,17 @@ static void omap_crtc_dss_unregister_framedone(
 		struct omap_drm_private *priv, enum omap_channel channel,
 		void (*handler)(void *), void *data)
 {
+	struct drm_crtc *crtc = priv->channels[channel]->crtc;
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct drm_device *dev = omap_crtc->base.dev;
+
+	dev_dbg(dev->dev, "unregister framedone %s", omap_crtc->name);
+
+	WARN_ON(omap_crtc->framedone_handler != handler);
+	WARN_ON(omap_crtc->framedone_handler_data != data);
+
+	omap_crtc->framedone_handler = NULL;
+	omap_crtc->framedone_handler_data = NULL;
 }
 
 static const struct dss_mgr_ops mgr_ops = {
@@ -303,6 +329,30 @@ void omap_crtc_vblank_irq(struct drm_crtc *crtc)
 	DBG("%s: apply done", omap_crtc->name);
 }
 
+void omap_crtc_framedone_irq(struct drm_crtc *crtc, uint32_t irqstatus)
+{
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+
+	if (!omap_crtc->framedone_handler) {
+		dev_warn(omap_crtc->base.dev->dev, "no framedone handler?");
+		return;
+	}
+
+	omap_crtc->framedone_handler(omap_crtc->framedone_handler_data);
+
+	spin_lock(&crtc->dev->event_lock);
+	/* Send the vblank event if one has been requested. */
+	if (omap_crtc->event) {
+		drm_crtc_send_vblank_event(crtc, omap_crtc->event);
+		omap_crtc->event = NULL;
+	}
+	omap_crtc->pending = false;
+	spin_unlock(&crtc->dev->event_lock);
+
+	/* Wake up omap_atomic_complete. */
+	wake_up(&omap_crtc->pending_wait);
+}
+
 static void omap_crtc_write_crtc_properties(struct drm_crtc *crtc)
 {
 	struct omap_drm_private *priv = crtc->dev->dev_private;
diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.h b/drivers/gpu/drm/omapdrm/omap_crtc.h
index d9de437ba9dd..d33bbb7a4f90 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.h
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.h
@@ -41,5 +41,6 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 int omap_crtc_wait_pending(struct drm_crtc *crtc);
 void omap_crtc_error_irq(struct drm_crtc *crtc, u32 irqstatus);
 void omap_crtc_vblank_irq(struct drm_crtc *crtc);
+void omap_crtc_framedone_irq(struct drm_crtc *crtc, uint32_t irqstatus);
 
 #endif /* __OMAPDRM_CRTC_H__ */
diff --git a/drivers/gpu/drm/omapdrm/omap_irq.c b/drivers/gpu/drm/omapdrm/omap_irq.c
index 329ad26d6d50..01dda84ca2ee 100644
--- a/drivers/gpu/drm/omapdrm/omap_irq.c
+++ b/drivers/gpu/drm/omapdrm/omap_irq.c
@@ -85,6 +85,28 @@ int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait,
 	return ret == 0 ? -1 : 0;
 }
 
+int omap_irq_enable_framedone(struct drm_crtc *crtc, bool enable)
+{
+	struct drm_device *dev = crtc->dev;
+	struct omap_drm_private *priv = dev->dev_private;
+	unsigned long flags;
+	enum omap_channel channel = omap_crtc_channel(crtc);
+	int framedone_irq =
+		priv->dispc_ops->mgr_get_framedone_irq(priv->dispc, channel);
+
+	DBG("dev=%p, crtc=%u, enable=%d", dev, channel, enable);
+
+	spin_lock_irqsave(&priv->wait_lock, flags);
+	if (enable)
+		priv->irq_mask |= framedone_irq;
+	else
+		priv->irq_mask &= ~framedone_irq;
+	omap_irq_update(dev);
+	spin_unlock_irqrestore(&priv->wait_lock, flags);
+
+	return 0;
+}
+
 /**
  * enable_vblank - enable vblank interrupt events
  * @dev: DRM device
@@ -217,6 +239,9 @@ static irqreturn_t omap_irq_handler(int irq, void *arg)
 
 		if (irqstatus & priv->dispc_ops->mgr_get_sync_lost_irq(priv->dispc, channel))
 			omap_crtc_error_irq(crtc, irqstatus);
+
+		if (irqstatus & priv->dispc_ops->mgr_get_framedone_irq(priv->dispc, channel))
+			omap_crtc_framedone_irq(crtc, irqstatus);
 	}
 
 	omap_irq_ocp_error_handler(dev, irqstatus);
diff --git a/drivers/gpu/drm/omapdrm/omap_irq.h b/drivers/gpu/drm/omapdrm/omap_irq.h
index 9d5441468eca..02abb4ed9813 100644
--- a/drivers/gpu/drm/omapdrm/omap_irq.h
+++ b/drivers/gpu/drm/omapdrm/omap_irq.h
@@ -27,6 +27,7 @@ struct drm_device;
 struct omap_irq_wait;
 
 int omap_irq_enable_vblank(struct drm_crtc *crtc);
+int omap_irq_enable_framedone(struct drm_crtc *crtc, bool enable);
 void omap_irq_disable_vblank(struct drm_crtc *crtc);
 void omap_drm_irq_uninstall(struct drm_device *dev);
 int omap_drm_irq_install(struct drm_device *dev);
-- 
2.19.1

[PATCHv4 6/6] drm/omap: add support for manually updated displays

[Sebastian Reichel]

This adds the required infrastructure for manually updated displays,
such as DSI command mode panels. While those panels often support
partial updates we currently always do a full refresh.

The display will be refreshed when something calls the dirty callback,
such as libdrm's drmModeDirtyFB(). This is currently being done at least
by the kernel console and Xorg (with modesetting driver) in their
default configuration. Weston does not implement this and the fbdev
backend does not work (display will not update). Weston's DRM backend
uses double buffering and the page flip will trigger a display refresh
and seems to work as expected.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/omapdrm/omap_crtc.c | 116 ++++++++++++++++++++++++++--
 drivers/gpu/drm/omapdrm/omap_crtc.h |   1 +
 drivers/gpu/drm/omapdrm/omap_fb.c   |  41 ++++++++++
 3 files changed, 153 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index 59ee2399f2e9..affbac28a64e 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -33,6 +33,7 @@ struct omap_crtc_state {
 	/* Shadow values for legacy userspace support. */
 	unsigned int rotation;
 	unsigned int zpos;
+	bool manually_updated;
 };
 
 #define to_omap_crtc(x) container_of(x, struct omap_crtc, base)
@@ -52,6 +53,7 @@ struct omap_crtc {
 	bool pending;
 	wait_queue_head_t pending_wait;
 	struct drm_pending_vblank_event *event;
+	struct delayed_work update_work;
 
 	void (*framedone_handler)(void *);
 	void *framedone_handler_data;
@@ -106,21 +108,18 @@ int omap_crtc_wait_pending(struct drm_crtc *crtc)
 /*
  * Manager-ops, callbacks from output when they need to configure
  * the upstream part of the video pipe.
- *
- * Most of these we can ignore until we add support for command-mode
- * panels.. for video-mode the crtc-helpers already do an adequate
- * job of sequencing the setup of the video pipe in the proper order
  */
 
-/* we can probably ignore these until we support command-mode panels: */
 static void omap_crtc_dss_start_update(struct omap_drm_private *priv,
 				       enum omap_channel channel)
 {
+	priv->dispc_ops->mgr_enable(priv->dispc, channel, true);
 }
 
 /* Called only from the encoder enable/disable and suspend/resume handlers. */
 static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 {
+	struct omap_crtc_state *omap_state = to_omap_crtc_state(crtc->state);
 	struct drm_device *dev = crtc->dev;
 	struct omap_drm_private *priv = dev->dev_private;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
@@ -132,6 +131,12 @@ static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 	if (WARN_ON(omap_crtc->enabled == enable))
 		return;
 
+	if (omap_state->manually_updated) {
+		omap_irq_enable_framedone(crtc, enable);
+		omap_crtc->enabled = enable;
+		return;
+	}
+
 	if (omap_crtc->pipe->output->output_type == OMAP_DISPLAY_TYPE_HDMI) {
 		priv->dispc_ops->mgr_enable(priv->dispc, channel, enable);
 		omap_crtc->enabled = enable;
@@ -353,6 +358,54 @@ void omap_crtc_framedone_irq(struct drm_crtc *crtc, uint32_t irqstatus)
 	wake_up(&omap_crtc->pending_wait);
 }
 
+void omap_crtc_flush(struct drm_crtc *crtc)
+{
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct omap_crtc_state *omap_state = to_omap_crtc_state(crtc->state);
+
+	if (!omap_state->manually_updated)
+		return;
+
+	if (!delayed_work_pending(&omap_crtc->update_work))
+		schedule_delayed_work(&omap_crtc->update_work, 0);
+}
+
+static void omap_crtc_manual_display_update(struct work_struct *data)
+{
+	struct omap_crtc *omap_crtc =
+			container_of(data, struct omap_crtc, update_work.work);
+	struct omap_dss_device *dssdev = omap_crtc->pipe->display;
+	struct drm_device *dev = omap_crtc->base.dev;
+	const struct omap_dss_driver *dssdrv;
+	struct videomode vm = {0};
+	int ret;
+
+	if (!dssdev) {
+		dev_err_once(dev->dev, "missing display dssdev!");
+		return;
+	}
+
+	dssdrv = dssdev->driver;
+	if (!dssdrv || !dssdrv->update) {
+		dev_err_once(dev->dev, "missing or incorrect dssdrv!");
+		return;
+	}
+
+	if (dssdrv->sync)
+		dssdrv->sync(dssdev);
+
+	if (dssdev->ops->get_timings)
+		dssdev->ops->get_timings(dssdev, &vm);
+
+	ret = dssdrv->update(dssdev, 0, 0, vm.hactive, vm.vactive);
+	if (ret < 0) {
+		spin_lock_irq(&dev->event_lock);
+		omap_crtc->pending = false;
+		spin_unlock_irq(&dev->event_lock);
+		wake_up(&omap_crtc->pending_wait);
+	}
+}
+
 static void omap_crtc_write_crtc_properties(struct drm_crtc *crtc)
 {
 	struct omap_drm_private *priv = crtc->dev->dev_private;
@@ -402,12 +455,17 @@ static void omap_crtc_atomic_enable(struct drm_crtc *crtc,
 {
 	struct omap_drm_private *priv = crtc->dev->dev_private;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct omap_crtc_state *omap_state = to_omap_crtc_state(crtc->state);
 	int ret;
 
 	DBG("%s", omap_crtc->name);
 
 	priv->dispc_ops->runtime_get(priv->dispc);
 
+	/* manual updated display will not trigger vsync irq */
+	if (omap_state->manually_updated)
+		return;
+
 	spin_lock_irq(&crtc->dev->event_lock);
 	drm_crtc_vblank_on(crtc);
 	ret = drm_crtc_vblank_get(crtc);
@@ -422,6 +480,7 @@ static void omap_crtc_atomic_disable(struct drm_crtc *crtc,
 {
 	struct omap_drm_private *priv = crtc->dev->dev_private;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct drm_device *dev = crtc->dev;
 
 	DBG("%s", omap_crtc->name);
 
@@ -432,6 +491,11 @@ static void omap_crtc_atomic_disable(struct drm_crtc *crtc,
 	}
 	spin_unlock_irq(&crtc->dev->event_lock);
 
+	cancel_delayed_work(&omap_crtc->update_work);
+
+	if (!omap_crtc_wait_pending(crtc))
+		dev_warn(dev->dev, "manual display update did not finish!");
+
 	drm_crtc_vblank_off(crtc);
 
 	priv->dispc_ops->runtime_put(priv->dispc);
@@ -487,6 +551,22 @@ static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	drm_display_mode_to_videomode(mode, &omap_crtc->vm);
 }
 
+static bool omap_crtc_is_manually_updated(struct drm_crtc *crtc)
+{
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct omap_dss_device *display = omap_crtc->pipe->display;
+
+	if (!display)
+		return false;
+
+	if (display->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE) {
+		DBG("detected manually updated display!");
+		return true;
+	}
+
+	return false;
+}
+
 static int omap_crtc_atomic_check(struct drm_crtc *crtc,
 				struct drm_crtc_state *state)
 {
@@ -508,6 +588,9 @@ static int omap_crtc_atomic_check(struct drm_crtc *crtc,
 		/* Mirror new values for zpos and rotation in omap_crtc_state */
 		omap_crtc_state->zpos = pri_state->zpos;
 		omap_crtc_state->rotation = pri_state->rotation;
+
+		/* Check if this CRTC is for a manually updated display */
+		omap_crtc_state->manually_updated = omap_crtc_is_manually_updated(crtc);
 	}
 
 	return 0;
@@ -523,6 +606,7 @@ static void omap_crtc_atomic_flush(struct drm_crtc *crtc,
 {
 	struct omap_drm_private *priv = crtc->dev->dev_private;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct omap_crtc_state *omap_crtc_state = to_omap_crtc_state(crtc->state);
 	int ret;
 
 	if (crtc->state->color_mgmt_changed) {
@@ -547,6 +631,15 @@ static void omap_crtc_atomic_flush(struct drm_crtc *crtc,
 
 	DBG("%s: GO", omap_crtc->name);
 
+	if (omap_crtc_state->manually_updated) {
+		/* send new image for page flips and modeset changes */
+		spin_lock_irq(&crtc->dev->event_lock);
+		omap_crtc_flush(crtc);
+		omap_crtc_arm_event(crtc);
+		spin_unlock_irq(&crtc->dev->event_lock);
+		return;
+	}
+
 	ret = drm_crtc_vblank_get(crtc);
 	WARN_ON(ret != 0);
 
@@ -632,6 +725,7 @@ omap_crtc_duplicate_state(struct drm_crtc *crtc)
 
 	state->zpos = current_state->zpos;
 	state->rotation = current_state->rotation;
+	state->manually_updated = current_state->manually_updated;
 
 	return &state->base;
 }
@@ -708,6 +802,18 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 	omap_crtc->channel = channel;
 	omap_crtc->name = channel_names[channel];
 
+	/* We want to refresh manually updated displays from dirty callback,
+	 * which is called quite often (e.g. for each drawn line). This will
+	 * be used to do the display update asynchronously to avoid blocking
+	 * the rendering process and merges multiple dirty calls into one
+	 * update if they arrive very fast. We also call this function for
+	 * atomic display updates (e.g. for page flips), which means we do
+	 * not need extra locking. Atomic updates should be synchronous, but
+	 * need to wait for the framedone interrupt anyways.
+	 */
+	INIT_DELAYED_WORK(&omap_crtc->update_work,
+			  omap_crtc_manual_display_update);
+
 	ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
 					&omap_crtc_funcs, NULL);
 	if (ret < 0) {
diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.h b/drivers/gpu/drm/omapdrm/omap_crtc.h
index d33bbb7a4f90..2b518c74203e 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.h
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.h
@@ -42,5 +42,6 @@ int omap_crtc_wait_pending(struct drm_crtc *crtc);
 void omap_crtc_error_irq(struct drm_crtc *crtc, u32 irqstatus);
 void omap_crtc_vblank_irq(struct drm_crtc *crtc);
 void omap_crtc_framedone_irq(struct drm_crtc *crtc, uint32_t irqstatus);
+void omap_crtc_flush(struct drm_crtc *crtc);
 
 #endif /* __OMAPDRM_CRTC_H__ */
diff --git a/drivers/gpu/drm/omapdrm/omap_fb.c b/drivers/gpu/drm/omapdrm/omap_fb.c
index 4d264fd554d8..5962cf5c744d 100644
--- a/drivers/gpu/drm/omapdrm/omap_fb.c
+++ b/drivers/gpu/drm/omapdrm/omap_fb.c
@@ -66,8 +66,49 @@ struct omap_framebuffer {
 	struct mutex lock;
 };
 
+/* iterate thru all the crts, returning ones that are attached to the same fb */
+static struct drm_crtc *omap_framebuffer_get_next_crtc(
+		struct drm_framebuffer *fb, struct drm_crtc *from)
+{
+	struct drm_device *dev = fb->dev;
+	struct list_head *crtc_list = &dev->mode_config.crtc_list;
+	struct drm_crtc *crtc = from;
+
+	if (!from)
+		return list_first_entry_or_null(crtc_list, typeof(*from), head);
+
+	list_for_each_entry_from(crtc, crtc_list, head) {
+		if (crtc == from)
+			continue;
+
+		if (crtc && crtc->primary->fb == fb)
+			return crtc;
+	}
+
+	return NULL;
+}
+
+static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
+				  struct drm_file *file_priv,
+				  unsigned flags, unsigned color,
+				  struct drm_clip_rect *clips,
+				  unsigned num_clips)
+{
+	struct drm_crtc *crtc = NULL;
+
+	drm_modeset_lock_all(fb->dev);
+
+	while ((crtc = omap_framebuffer_get_next_crtc(fb, crtc)))
+		omap_crtc_flush(crtc);
+
+	drm_modeset_unlock_all(fb->dev);
+
+	return 0;
+}
+
 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
 	.create_handle = drm_gem_fb_create_handle,
+	.dirty = omap_framebuffer_dirty,
 	.destroy = drm_gem_fb_destroy,
 };
 
-- 
2.19.1

Re: [PATCHv4 4/6] drm/omap: fix incorrect union usage

[Tomi Valkeinen]

On 16/11/18 01:06, Sebastian Reichel wrote:
> The DSI encoder sets dssdev->ops->dsi.set_config, which is stored at the
> same offset as dssdev->ops->hdmi.set_hdmi_mode. The code in omap_encoder
> only checks if dssdev->ops->hdmi.set_hdmi_mode is NULL. Due to the way
> union works, it won't be NULL if dsi.set_config is set. This means
> dsi_set_config will be called with config=hdmi_mode=false=NULL parameter
> resulting in a NULL dereference. Also the dereference happens while
> console is locked, so kernel hangs without any debug output (can be
> avoided by fbmem's lockless_register_fb=1 parameter).
> 
> This fixes the issue by exiting early if the output type definitely
> has no hdmi_set operations.
> 
> Fixes: 83910ad3f51fb ("drm/omap: Move most omap_dss_driver operations to omap_dss_device_ops")
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  drivers/gpu/drm/omapdrm/omap_encoder.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
> index 32bbe3a80e7d..ba0099f0644c 100644
> --- a/drivers/gpu/drm/omapdrm/omap_encoder.c
> +++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
> @@ -122,6 +122,14 @@ static void omap_encoder_mode_set(struct drm_encoder *encoder,
>  
>  	dssdev = omap_encoder->output;
>  
> +	/* The following operations access dssdev->ops->hdmi, which is a union
> +	 * also used by DSI. This ensures, that the field does not have data
> +	 * for DSI (or any other future output type).
> +	 */
> +	if (dssdev->output_type != OMAP_DISPLAY_TYPE_HDMI &&
> +	    dssdev->output_type != OMAP_DISPLAY_TYPE_DVI)

Good catch.

Why DVI?

I think the whole code block starting from

/* Set the HDMI mode and HDMI infoframe if applicable. */

to the end of the function should be inside

if (dssdev->output_type == OMAP_DISPLAY_TYPE_HDMI)

 Tomi

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Re: [PATCHv4 0/6] omapdrm: DSI command mode panel support

[Tony Lindgren]

* Sebastian Reichel <sebastian.reichel@collabora.com> [181115 23:07]:
> Hi,
> 
> It's time for a new revision of the DSI command mode panel
> patchset. The patches have been rebased to 4.20-rc1 + fixes
> from Laurent and Tony. I dropped the patches for OMAP3 support
> (it needs a workaround for a hardware bug) and for automatic
> display rotation. They should get their own series, once this
> patchset has landed.

Great, works for me:

Tested-by: Tony Lindgren <tony@atomide.com>

Re: [PATCHv4 4/6] drm/omap: fix incorrect union usage

[Sebastian Reichel]

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Hi Tomi,

On Fri, Nov 16, 2018 at 03:41:24PM +0200, Tomi Valkeinen wrote:
> On 16/11/18 01:06, Sebastian Reichel wrote:
> > The DSI encoder sets dssdev->ops->dsi.set_config, which is stored at the
> > same offset as dssdev->ops->hdmi.set_hdmi_mode. The code in omap_encoder
> > only checks if dssdev->ops->hdmi.set_hdmi_mode is NULL. Due to the way
> > union works, it won't be NULL if dsi.set_config is set. This means
> > dsi_set_config will be called with config=hdmi_mode=false=NULL parameter
> > resulting in a NULL dereference. Also the dereference happens while
> > console is locked, so kernel hangs without any debug output (can be
> > avoided by fbmem's lockless_register_fb=1 parameter).
> > 
> > This fixes the issue by exiting early if the output type definitely
> > has no hdmi_set operations.
> > 
> > Fixes: 83910ad3f51fb ("drm/omap: Move most omap_dss_driver operations to omap_dss_device_ops")
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> > ---
> >  drivers/gpu/drm/omapdrm/omap_encoder.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
> > index 32bbe3a80e7d..ba0099f0644c 100644
> > --- a/drivers/gpu/drm/omapdrm/omap_encoder.c
> > +++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
> > @@ -122,6 +122,14 @@ static void omap_encoder_mode_set(struct drm_encoder *encoder,
> >  
> >  	dssdev = omap_encoder->output;
> >  
> > +	/* The following operations access dssdev->ops->hdmi, which is a union
> > +	 * also used by DSI. This ensures, that the field does not have data
> > +	 * for DSI (or any other future output type).
> > +	 */
> > +	if (dssdev->output_type != OMAP_DISPLAY_TYPE_HDMI &&
> > +	    dssdev->output_type != OMAP_DISPLAY_TYPE_DVI)
> 
> Good catch.
> 
> Why DVI?
> 
> I think the whole code block starting from
> 
> /* Set the HDMI mode and HDMI infoframe if applicable. */
> 
> to the end of the function should be inside
> 
> if (dssdev->output_type == OMAP_DISPLAY_TYPE_HDMI)

When I identified the issue I whitelisted DVI, since I wasn't sure
if it also has the HDMI functionality. I planned to check the code
later and then forgot about it. You are right, this should only
check for HDMI.

-- Sebastian

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Re: [PATCHv4 0/6] omapdrm: DSI command mode panel support

[Pavel Machek]

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Hi!

> It's time for a new revision of the DSI command mode panel
> patchset. The patches have been rebased to 4.20-rc1 + fixes
> from Laurent and Tony. I dropped the patches for OMAP3 support
> (it needs a workaround for a hardware bug) and for automatic
> display rotation. They should get their own series, once this
> patchset has landed.

Thanks for doing this!

Tested-by: Pavel Machek <pavel@ucw.cz>

Tested console and X on Droid 4, after hacking in some kind of
backlight support. Works as expected :-).

Best regards,
									Pavel

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Re: [PATCHv4 1/6] drm/omap: use DRM_DEBUG_DRIVER instead of CORE

[Pavel Machek]

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On Fri 2018-11-16 00:06:40, Sebastian Reichel wrote:
> This macro is only used by omapdrm, which should print
> debug messages using the DRIVER category instead of the
> default CORE category.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Acked-by: Pavel Machek <pavel@ucw.cz>


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Re: [PATCHv4 2/6] drm/omap: populate DSI platform bus earlier

[Pavel Machek]

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On Fri 2018-11-16 00:06:41, Sebastian Reichel wrote:
> After the changes from 4.20 the DSI encoder tries to find the
> attached panel before populating the DSI bus. If the panel is
> not found -EPROBE_DEFER is returned, so the DSI bus is never
> populated and the panel never added.
> 
> Fix this by populating the DSI bus before searching for the
> video sink in dsi_init_output().
> 
> Fixes: 27d624527d992 ("drm/omap: dss: Acquire next dssdev at probe time")
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Acked-by: Pavel Machek <pavel@ucw.cz>

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Re: [PATCHv4 3/6] drm/omap: don't check dispc timings for DSI

[Pavel Machek]

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On Fri 2018-11-16 00:06:42, Sebastian Reichel wrote:
> While all display types only forward their VM to the DISPC, this

"While most?"

> is not true for DSI. DSI calculates the VM for DISPC based on its
> own, but its not identical. Actually the DSI VM is not even a valid

"but it is not"

> DISPC VM making this check fail. Let's restore the old behaviour
> and avoid checking the DISPC VM for DSI here.
> 
> Fixes: 7c27fa57ef31 ("drm/omap: Call dispc timings check operation directly")
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Acked-by: Pavel Machek <pavel@ucw.cz>

With the fixes tag, stable is going to pick this up. Do we want this
in stable?

I believe stable does not need it as it is not going to get manually
updated display support, anyway?

Best regards,
									Pavel

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Re: [PATCHv4 5/6] drm/omap: add framedone interrupt support

[Pavel Machek]

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Hi!

> This prepares framedone interrupt handling for
> manual display update support.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Acked-by: Pavel Machek <pavel@ucw.cz>

> @@ -217,6 +239,9 @@ static irqreturn_t omap_irq_handler(int irq, void *arg)
>  
>  		if (irqstatus & priv->dispc_ops->mgr_get_sync_lost_irq(priv->dispc, channel))
>  			omap_crtc_error_irq(crtc, irqstatus);
> +
> +		if (irqstatus & priv->dispc_ops->mgr_get_framedone_irq(priv->dispc, channel))
> +			omap_crtc_framedone_irq(crtc, irqstatus);
>  	}
>  
>  	omap_irq_ocp_error_handler(dev, irqstatus);

Will the mgr_get_framedone_irq(priv->dispc, channel) change from
interrupt to interrupt? Would it make sense to cache result as a
micro-organization?

Thanks,
									Pavel

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Re: [PATCHv4 6/6] drm/omap: add support for manually updated displays

[Pavel Machek]

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On Fri 2018-11-16 00:06:45, Sebastian Reichel wrote:
> This adds the required infrastructure for manually updated displays,
> such as DSI command mode panels. While those panels often support
> partial updates we currently always do a full refresh.
> 
> The display will be refreshed when something calls the dirty callback,
> such as libdrm's drmModeDirtyFB(). This is currently being done at least
> by the kernel console and Xorg (with modesetting driver) in their
> default configuration. Weston does not implement this and the fbdev
> backend does not work (display will not update). Weston's DRM backend
> uses double buffering and the page flip will trigger a display refresh
> and seems to work as expected.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Acked-by: Pavel Machek <pavel@ucw.cz>

> @@ -708,6 +802,18 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
>  	omap_crtc->channel = channel;
>  	omap_crtc->name = channel_names[channel];
>  
> +	/* We want to refresh manually updated displays from dirty callback,

Nit: Comment style does not match coding style.

/*
 *
 
 --- a/drivers/gpu/drm/omapdrm/omap_fb.c
> +++ b/drivers/gpu/drm/omapdrm/omap_fb.c
> @@ -66,8 +66,49 @@ struct omap_framebuffer {
>  	struct mutex lock;
>  };
>  
> +/* iterate thru all the crts, returning ones that are attached to the same fb */

Start with big letter -- "Iterate"?

Thanks,
									Pavel

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Re: [PATCHv4 5/6] drm/omap: add framedone interrupt support

[Sebastian Reichel]

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Hi,

On Sat, Nov 17, 2018 at 10:08:40PM +0100, Pavel Machek wrote:
> > This prepares framedone interrupt handling for
> > manual display update support.
> > 
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> 
> Acked-by: Pavel Machek <pavel@ucw.cz>

Thanks.

> > @@ -217,6 +239,9 @@ static irqreturn_t omap_irq_handler(int irq, void *arg)
> >  
> >  		if (irqstatus & priv->dispc_ops->mgr_get_sync_lost_irq(priv->dispc, channel))
> >  			omap_crtc_error_irq(crtc, irqstatus);
> > +
> > +		if (irqstatus & priv->dispc_ops->mgr_get_framedone_irq(priv->dispc, channel))
> > +			omap_crtc_framedone_irq(crtc, irqstatus);
> >  	}
> >  
> >  	omap_irq_ocp_error_handler(dev, irqstatus);
> 
> Will the mgr_get_framedone_irq(priv->dispc, channel) change from
> interrupt to interrupt? Would it make sense to cache result as a
> micro-organization?

Maybe. But this is the same for the the omap_crtc_error_* and the
driver is currently being restructured by Laurent. I think this can
wait for later.

-- Sebastian

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Re: [PATCHv4 5/6] drm/omap: add framedone interrupt support

[Pavel Machek]

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Hi!

> > > @@ -217,6 +239,9 @@ static irqreturn_t omap_irq_handler(int irq, void *arg)
> > >  
> > >  		if (irqstatus & priv->dispc_ops->mgr_get_sync_lost_irq(priv->dispc, channel))
> > >  			omap_crtc_error_irq(crtc, irqstatus);
> > > +
> > > +		if (irqstatus & priv->dispc_ops->mgr_get_framedone_irq(priv->dispc, channel))
> > > +			omap_crtc_framedone_irq(crtc, irqstatus);
> > >  	}
> > >  
> > >  	omap_irq_ocp_error_handler(dev, irqstatus);
> > 
> > Will the mgr_get_framedone_irq(priv->dispc, channel) change from
> > interrupt to interrupt? Would it make sense to cache result as a
> > micro-organization?
> 
> Maybe. But this is the same for the the omap_crtc_error_* and the
> driver is currently being restructured by Laurent. I think this can
> wait for later.

Definitely can wait. Thanks!
									Pavel

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