Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit eb8c8880 authored by Philipp Zabel's avatar Philipp Zabel
Browse files

drm/imx: add deferred plane disabling 



The DP (display processor) channel disable code tried to busy wait for
the DP sync flow end interrupt status bit when disabling the partial
plane without a full modeset. That never worked reliably, and it was
disabled completely by the recent "gpu: ipu-v3: remove IRQ dance on DC
channel disable" patch, causing ipu_wait_interrupt to always time out
after 50 ms, which in turn would trigger a timeout in
drm_atomic_helper_wait_for_vblanks.

This patch changes ipu_plane_atomic_disable to only queue a DP channel
register update at the next frame boundary and set a flag, which can be
done without any waiting whatsoever. The imx_drm_atomic_commit_tail then
calls a new ipu_plane_disable_deferred function that does the actual
IDMAC teardown of the planes that are flagged for deferred disabling,
after waiting for the vblank.

Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: default avatarLucas Stach <l.stach@pengutronix.de>
parent cf92fefd

drivers/gpu/drm/imx/imx-drm-core.c

+18 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <video/imx-ipu-v3.h>



#include "imx-drm.h"

#include "ipuv3-plane.h"



#define MAX_CRTC	4
@@ -122,6 +123,10 @@ static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = { 
static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)

{

	struct drm_device *dev = state->dev;

	struct drm_plane *plane;

	struct drm_plane_state *old_plane_state;

	bool plane_disabling = false;

	int i;



	drm_atomic_helper_commit_modeset_disables(dev, state);
@@ -131,6 +136,19 @@ static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state) 


	drm_atomic_helper_commit_modeset_enables(dev, state);



	for_each_plane_in_state(state, plane, old_plane_state, i) {

		if (drm_atomic_plane_disabling(old_plane_state, plane->state))

			plane_disabling = true;

	}



	if (plane_disabling) {

		drm_atomic_helper_wait_for_vblanks(dev, state);



		for_each_plane_in_state(state, plane, old_plane_state, i)

			ipu_plane_disable_deferred(plane);



	}



	drm_atomic_helper_commit_hw_done(state);

}

drivers/gpu/drm/imx/ipuv3-crtc.c

+21 −1
Original line number Diff line number Diff line
@@ -60,6 +60,26 @@ static void ipu_crtc_enable(struct drm_crtc *crtc) 
	ipu_di_enable(ipu_crtc->di);

}



static void ipu_crtc_disable_planes(struct ipu_crtc *ipu_crtc,

				    struct drm_crtc_state *old_crtc_state)

{

	bool disable_partial = false;

	bool disable_full = false;

	struct drm_plane *plane;



	drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {

		if (plane == &ipu_crtc->plane[0]->base)

			disable_full = true;

		if (&ipu_crtc->plane[1] && plane == &ipu_crtc->plane[1]->base)

			disable_partial = true;

	}



	if (disable_partial)

		ipu_plane_disable(ipu_crtc->plane[1], true);

	if (disable_full)

		ipu_plane_disable(ipu_crtc->plane[0], false);

}



static void ipu_crtc_atomic_disable(struct drm_crtc *crtc,

				    struct drm_crtc_state *old_crtc_state)

{
@@ -73,7 +93,7 @@ static void ipu_crtc_atomic_disable(struct drm_crtc *crtc, 
	 * attached IDMACs will be left in undefined state, possibly hanging

	 * the IPU or even system.

	 */

	drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false);

	ipu_crtc_disable_planes(ipu_crtc, old_crtc_state);

	ipu_dc_disable(ipu);



	spin_lock_irq(&crtc->dev->event_lock);

drivers/gpu/drm/imx/ipuv3-plane.c

+18 −7
Original line number Diff line number Diff line
@@ -172,23 +172,30 @@ static void ipu_plane_enable(struct ipu_plane *ipu_plane) 
		ipu_dp_enable_channel(ipu_plane->dp);

}



static int ipu_disable_plane(struct drm_plane *plane)

void ipu_plane_disable(struct ipu_plane *ipu_plane, bool disable_dp_channel)

{

	struct ipu_plane *ipu_plane = to_ipu_plane(plane);



	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);



	ipu_idmac_wait_busy(ipu_plane->ipu_ch, 50);



	if (ipu_plane->dp)

		ipu_dp_disable_channel(ipu_plane->dp, true);

	if (ipu_plane->dp && disable_dp_channel)

		ipu_dp_disable_channel(ipu_plane->dp, false);

	ipu_idmac_disable_channel(ipu_plane->ipu_ch);

	ipu_dmfc_disable_channel(ipu_plane->dmfc);

	if (ipu_plane->dp)

		ipu_dp_disable(ipu_plane->ipu);

}



	return 0;

void ipu_plane_disable_deferred(struct drm_plane *plane)

{

	struct ipu_plane *ipu_plane = to_ipu_plane(plane);



	if (ipu_plane->disabling) {

		ipu_plane->disabling = false;

		ipu_plane_disable(ipu_plane, false);

	}

}

EXPORT_SYMBOL_GPL(ipu_plane_disable_deferred);



static void ipu_plane_destroy(struct drm_plane *plane)

{
@@ -356,7 +363,11 @@ static int ipu_plane_atomic_check(struct drm_plane *plane, 
static void ipu_plane_atomic_disable(struct drm_plane *plane,

				     struct drm_plane_state *old_state)

{

	ipu_disable_plane(plane);

	struct ipu_plane *ipu_plane = to_ipu_plane(plane);



	if (ipu_plane->dp)

		ipu_dp_disable_channel(ipu_plane->dp, true);

	ipu_plane->disabling = true;

}



static void ipu_plane_atomic_update(struct drm_plane *plane,

drivers/gpu/drm/imx/ipuv3-plane.h

+5 −0
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ struct ipu_plane { 


	int			dma;

	int			dp_flow;



	bool			disabling;

};



struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
@@ -42,4 +44,7 @@ void ipu_plane_put_resources(struct ipu_plane *plane); 


int ipu_plane_irq(struct ipu_plane *plane);



void ipu_plane_disable(struct ipu_plane *ipu_plane, bool disable_dp_channel);

void ipu_plane_disable_deferred(struct drm_plane *plane);



#endif

drivers/gpu/ipu-v3/ipu-dp.c

+0 −3
Original line number Diff line number Diff line
@@ -277,9 +277,6 @@ void ipu_dp_disable_channel(struct ipu_dp *dp, bool sync) 
	writel(0, flow->base + DP_FG_POS);

	ipu_srm_dp_update(priv->ipu, sync);



	if (ipu_idmac_channel_busy(priv->ipu, IPUV3_CHANNEL_MEM_BG_SYNC))

		ipu_wait_interrupt(priv->ipu, IPU_IRQ_DP_SF_END, 50);



	mutex_unlock(&priv->mutex);

}

EXPORT_SYMBOL_GPL(ipu_dp_disable_channel);