[PATCH v2 1/3] drm/exynos: remove to call mixer_wait_for_vblank

[PATCH v2 1/3] drm/exynos: remove to call mixer_wait_for_vblank

[Joonyoung Shim]

The reason waiting vblank is to be power gated and disabled clocks after
dma operation is completed. The dma operation is stopped already before
be power gated and clocks are disabled when mixer is disabled by commit
381be025ac1a6("drm/exynos: stop mixer before gating clocks during
poweroff"). Don't need to wait vblank anymore.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_mixer.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 6bab717..f93f038 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -1010,7 +1010,6 @@ static void mixer_window_suspend(struct mixer_context *ctx)
 		plane->resume = plane->enabled;
 		mixer_win_disable(ctx->crtc, i);
 	}
-	mixer_wait_for_vblank(ctx->crtc);
 }
 
 static void mixer_window_resume(struct mixer_context *ctx)
-- 
1.9.1

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[PATCH v2 2/3] drm/exynos: remove chained calls to enable

[Joonyoung Shim]

With atomic modesetting all the control for CRTC, Planes, Encoders and
Connectors should come from DRM core, so the driver is not allowed to
enable or disable planes from inside the crtc_enable()/disable() call.

But it needs to disable planes with crtc_disable in exynos driver
internally. Because crtc is disabled before plane is disabled, it means
plane_disable just returns without any register changes, then we cannot
be sure setting register to disable plane when crtc is disable.

This patch removes this chainned calls to enable plane from exynos hw
drivers code letting only DRM core touch planes except to disable plane.
Also it leads eliminable enabled and resume of struct exynos_drm_plane.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
This patch was modified from original patch of Gustavo Padovan - 
http://www.spinics.net/lists/linux-samsung-soc/msg45351.html

v2 changes:
- add 1/3 additional patch to remove waiting vblank in mixer.
- rebase this from 1/3 patch.
- add 3/3 additional patch to fix IOMMU page fault of fimd.

 drivers/gpu/drm/exynos/exynos7_drm_decon.c | 63 +++---------------------------
 drivers/gpu/drm/exynos/exynos_drm_drv.h    |  5 ---
 drivers/gpu/drm/exynos/exynos_drm_fimd.c   | 63 +++---------------------------
 drivers/gpu/drm/exynos/exynos_drm_vidi.c   | 27 -------------
 drivers/gpu/drm/exynos/exynos_mixer.c      | 38 ++----------------
 5 files changed, 16 insertions(+), 180 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
index d659ba2..f73ceae 100644
--- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
@@ -410,11 +410,8 @@ static void decon_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
 
 	plane = &ctx->planes[win];
 
-	/* If suspended, enable this on resume */
-	if (ctx->suspended) {
-		plane->resume = true;
+	if (ctx->suspended)
 		return;
-	}
 
 	/*
 	 * SHADOWCON/PRTCON register is used for enabling timing.
@@ -506,8 +503,6 @@ static void decon_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
 	val = readl(ctx->regs + DECON_UPDATE);
 	val |= DECON_UPDATE_STANDALONE_F;
 	writel(val, ctx->regs + DECON_UPDATE);
-
-	plane->enabled = true;
 }
 
 static void decon_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
@@ -521,11 +516,8 @@ static void decon_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
 
 	plane = &ctx->planes[win];
 
-	if (ctx->suspended) {
-		/* do not resume this window*/
-		plane->resume = false;
+	if (ctx->suspended)
 		return;
-	}
 
 	/* protect windows */
 	decon_shadow_protect_win(ctx, win, true);
@@ -541,49 +533,6 @@ static void decon_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
 	val = readl(ctx->regs + DECON_UPDATE);
 	val |= DECON_UPDATE_STANDALONE_F;
 	writel(val, ctx->regs + DECON_UPDATE);
-
-	plane->enabled = false;
-}
-
-static void decon_window_suspend(struct decon_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < WINDOWS_NR; i++) {
-		plane = &ctx->planes[i];
-		plane->resume = plane->enabled;
-		if (plane->enabled)
-			decon_win_disable(ctx->crtc, i);
-	}
-}
-
-static void decon_window_resume(struct decon_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < WINDOWS_NR; i++) {
-		plane = &ctx->planes[i];
-		plane->enabled = plane->resume;
-		plane->resume = false;
-	}
-}
-
-static void decon_apply(struct decon_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < WINDOWS_NR; i++) {
-		plane = &ctx->planes[i];
-		if (plane->enabled)
-			decon_win_commit(ctx->crtc, i);
-		else
-			decon_win_disable(ctx->crtc, i);
-	}
-
-	decon_commit(ctx->crtc);
 }
 
 static void decon_init(struct decon_context *ctx)
@@ -625,14 +574,13 @@ static void decon_enable(struct exynos_drm_crtc *crtc)
 	if (test_and_clear_bit(0, &ctx->irq_flags))
 		decon_enable_vblank(ctx->crtc);
 
-	decon_window_resume(ctx);
-
-	decon_apply(ctx);
+	decon_commit(ctx->crtc);
 }
 
 static void decon_disable(struct exynos_drm_crtc *crtc)
 {
 	struct decon_context *ctx = crtc->ctx;
+	int i;
 
 	if (ctx->suspended)
 		return;
@@ -642,7 +590,8 @@ static void decon_disable(struct exynos_drm_crtc *crtc)
 	 * suspend that connector. Otherwise we might try to scan from
 	 * a destroyed buffer later.
 	 */
-	decon_window_suspend(ctx);
+	for (i = 0; i < WINDOWS_NR; i++)
+		decon_win_disable(crtc, i);
 
 	clk_disable_unprepare(ctx->vclk);
 	clk_disable_unprepare(ctx->eclk);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index 1c66f65..291f130 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -71,8 +71,6 @@ enum exynos_drm_output_type {
  * @dma_addr: array of bus(accessed by dma) address to the memory region
  *	      allocated for a overlay.
  * @zpos: order of overlay layer(z position).
- * @enabled: enabled or not.
- * @resume: to resume or not.
  *
  * this structure is common to exynos SoC and its contents would be copied
  * to hardware specific overlay info.
@@ -101,9 +99,6 @@ struct exynos_drm_plane {
 	uint32_t pixel_format;
 	dma_addr_t dma_addr[MAX_FB_BUFFER];
 	unsigned int zpos;
-
-	bool enabled:1;
-	bool resume:1;
 };
 
 /*
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 9661853..b45e09b 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -634,11 +634,8 @@ static void fimd_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
 
 	plane = &ctx->planes[win];
 
-	/* If suspended, enable this on resume */
-	if (ctx->suspended) {
-		plane->resume = true;
+	if (ctx->suspended)
 		return;
-	}
 
 	/*
 	 * SHADOWCON/PRTCON register is used for enabling timing.
@@ -728,8 +725,6 @@ static void fimd_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
 	/* Enable DMA channel and unprotect windows */
 	fimd_shadow_protect_win(ctx, win, false);
 
-	plane->enabled = true;
-
 	if (ctx->i80_if)
 		atomic_set(&ctx->win_updated, 1);
 }
@@ -744,11 +739,8 @@ static void fimd_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
 
 	plane = &ctx->planes[win];
 
-	if (ctx->suspended) {
-		/* do not resume this window*/
-		plane->resume = false;
+	if (ctx->suspended)
 		return;
-	}
 
 	/* protect windows */
 	fimd_shadow_protect_win(ctx, win, true);
@@ -760,49 +752,6 @@ static void fimd_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
 
 	/* unprotect windows */
 	fimd_shadow_protect_win(ctx, win, false);
-
-	plane->enabled = false;
-}
-
-static void fimd_window_suspend(struct fimd_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < WINDOWS_NR; i++) {
-		plane = &ctx->planes[i];
-		plane->resume = plane->enabled;
-		if (plane->enabled)
-			fimd_win_disable(ctx->crtc, i);
-	}
-}
-
-static void fimd_window_resume(struct fimd_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < WINDOWS_NR; i++) {
-		plane = &ctx->planes[i];
-		plane->enabled = plane->resume;
-		plane->resume = false;
-	}
-}
-
-static void fimd_apply(struct fimd_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < WINDOWS_NR; i++) {
-		plane = &ctx->planes[i];
-		if (plane->enabled)
-			fimd_win_commit(ctx->crtc, i);
-		else
-			fimd_win_disable(ctx->crtc, i);
-	}
-
-	fimd_commit(ctx->crtc);
 }
 
 static void fimd_enable(struct exynos_drm_crtc *crtc)
@@ -823,14 +772,13 @@ static void fimd_enable(struct exynos_drm_crtc *crtc)
 	if (test_and_clear_bit(0, &ctx->irq_flags))
 		fimd_enable_vblank(ctx->crtc);
 
-	fimd_window_resume(ctx);
-
-	fimd_apply(ctx);
+	fimd_commit(ctx->crtc);
 }
 
 static void fimd_disable(struct exynos_drm_crtc *crtc)
 {
 	struct fimd_context *ctx = crtc->ctx;
+	int i;
 
 	if (ctx->suspended)
 		return;
@@ -840,7 +788,8 @@ static void fimd_disable(struct exynos_drm_crtc *crtc)
 	 * suspend that connector. Otherwise we might try to scan from
 	 * a destroyed buffer later.
 	 */
-	fimd_window_suspend(ctx);
+	for (i = 0; i < WINDOWS_NR; i++)
+		fimd_win_disable(crtc, i);
 
 	clk_disable_unprepare(ctx->lcd_clk);
 	clk_disable_unprepare(ctx->bus_clk);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
index abe4ee0..e55174f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
@@ -131,33 +131,15 @@ static void vidi_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
 
 	plane = &ctx->planes[win];
 
-	plane->enabled = true;
-
 	DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr);
 
 	if (ctx->vblank_on)
 		schedule_work(&ctx->work);
 }
 
-static void vidi_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
-{
-	struct vidi_context *ctx = crtc->ctx;
-	struct exynos_drm_plane *plane;
-
-	if (win < 0 || win >= WINDOWS_NR)
-		return;
-
-	plane = &ctx->planes[win];
-	plane->enabled = false;
-
-	/* TODO. */
-}
-
 static void vidi_enable(struct exynos_drm_crtc *crtc)
 {
 	struct vidi_context *ctx = crtc->ctx;
-	struct exynos_drm_plane *plane;
-	int i;
 
 	mutex_lock(&ctx->lock);
 
@@ -167,20 +149,12 @@ static void vidi_enable(struct exynos_drm_crtc *crtc)
 	if (test_and_clear_bit(0, &ctx->irq_flags))
 		vidi_enable_vblank(ctx->crtc);
 
-	for (i = 0; i < WINDOWS_NR; i++) {
-		plane = &ctx->planes[i];
-		if (plane->enabled)
-			vidi_win_commit(ctx->crtc, i);
-	}
-
 	mutex_unlock(&ctx->lock);
 }
 
 static void vidi_disable(struct exynos_drm_crtc *crtc)
 {
 	struct vidi_context *ctx = crtc->ctx;
-	struct exynos_drm_plane *plane;
-	int i;
 
 	mutex_lock(&ctx->lock);
 
@@ -206,7 +180,6 @@ static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
 	.enable_vblank = vidi_enable_vblank,
 	.disable_vblank = vidi_disable_vblank,
 	.win_commit = vidi_win_commit,
-	.win_disable = vidi_win_disable,
 };
 
 static void vidi_fake_vblank_handler(struct work_struct *work)
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index f93f038..966cbf8 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -937,8 +937,6 @@ static void mixer_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
 		vp_video_buffer(mixer_ctx, win);
 	else
 		mixer_graph_buffer(mixer_ctx, win);
-
-	mixer_ctx->planes[win].enabled = true;
 }
 
 static void mixer_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
@@ -952,7 +950,6 @@ static void mixer_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
 	mutex_lock(&mixer_ctx->mixer_mutex);
 	if (!mixer_ctx->powered) {
 		mutex_unlock(&mixer_ctx->mixer_mutex);
-		mixer_ctx->planes[win].resume = false;
 		return;
 	}
 	mutex_unlock(&mixer_ctx->mixer_mutex);
@@ -964,8 +961,6 @@ static void mixer_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
 
 	mixer_vsync_set_update(mixer_ctx, true);
 	spin_unlock_irqrestore(&res->reg_slock, flags);
-
-	mixer_ctx->planes[win].enabled = false;
 }
 
 static void mixer_wait_for_vblank(struct exynos_drm_crtc *crtc)
@@ -1000,32 +995,6 @@ static void mixer_wait_for_vblank(struct exynos_drm_crtc *crtc)
 	drm_vblank_put(mixer_ctx->drm_dev, mixer_ctx->pipe);
 }
 
-static void mixer_window_suspend(struct mixer_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < MIXER_WIN_NR; i++) {
-		plane = &ctx->planes[i];
-		plane->resume = plane->enabled;
-		mixer_win_disable(ctx->crtc, i);
-	}
-}
-
-static void mixer_window_resume(struct mixer_context *ctx)
-{
-	struct exynos_drm_plane *plane;
-	int i;
-
-	for (i = 0; i < MIXER_WIN_NR; i++) {
-		plane = &ctx->planes[i];
-		plane->enabled = plane->resume;
-		plane->resume = false;
-		if (plane->enabled)
-			mixer_win_commit(ctx->crtc, i);
-	}
-}
-
 static void mixer_enable(struct exynos_drm_crtc *crtc)
 {
 	struct mixer_context *ctx = crtc->ctx;
@@ -1057,14 +1026,13 @@ static void mixer_enable(struct exynos_drm_crtc *crtc)
 
 	mixer_reg_write(res, MXR_INT_EN, ctx->int_en);
 	mixer_win_reset(ctx);
-
-	mixer_window_resume(ctx);
 }
 
 static void mixer_disable(struct exynos_drm_crtc *crtc)
 {
 	struct mixer_context *ctx = crtc->ctx;
 	struct mixer_resources *res = &ctx->mixer_res;
+	int i;
 
 	mutex_lock(&ctx->mixer_mutex);
 	if (!ctx->powered) {
@@ -1075,7 +1043,9 @@ static void mixer_disable(struct exynos_drm_crtc *crtc)
 
 	mixer_stop(ctx);
 	mixer_regs_dump(ctx);
-	mixer_window_suspend(ctx);
+
+	for (i = 0; i < MIXER_WIN_NR; i++)
+		mixer_win_disable(crtc, i);
 
 	ctx->int_en = mixer_reg_read(res, MXR_INT_EN);
 
-- 
1.9.1

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Re: [PATCH v2 2/3] drm/exynos: remove chained calls to enable

[Gustavo Padovan]

Hi Joonyoung,

2015-06-12 Joonyoung Shim <jy0922.shim@samsung.com>:

> With atomic modesetting all the control for CRTC, Planes, Encoders and
> Connectors should come from DRM core, so the driver is not allowed to
> enable or disable planes from inside the crtc_enable()/disable() call.
> 
> But it needs to disable planes with crtc_disable in exynos driver
> internally. Because crtc is disabled before plane is disabled, it means
> plane_disable just returns without any register changes, then we cannot
> be sure setting register to disable plane when crtc is disable.
> 
> This patch removes this chainned calls to enable plane from exynos hw
> drivers code letting only DRM core touch planes except to disable plane.
> Also it leads eliminable enabled and resume of struct exynos_drm_plane.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
> This patch was modified from original patch of Gustavo Padovan - 
> http://www.spinics.net/lists/linux-samsung-soc/msg45351.html
> 
> v2 changes:
> - add 1/3 additional patch to remove waiting vblank in mixer.
> - rebase this from 1/3 patch.
> - add 3/3 additional patch to fix IOMMU page fault of fimd.
> 
>  drivers/gpu/drm/exynos/exynos7_drm_decon.c | 63 +++---------------------------
>  drivers/gpu/drm/exynos/exynos_drm_drv.h    |  5 ---
>  drivers/gpu/drm/exynos/exynos_drm_fimd.c   | 63 +++---------------------------
>  drivers/gpu/drm/exynos/exynos_drm_vidi.c   | 27 -------------
>  drivers/gpu/drm/exynos/exynos_mixer.c      | 38 ++----------------
>  5 files changed, 16 insertions(+), 180 deletions(-)

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

	Gustavo

[PATCH v2 3/3] drm/exynos: initialize VIDCON0 when fimd is disabled

[Joonyoung Shim]

When the fimd is disabled by fimd_disable(), enabled overlay layers also
are disabled. If clocks for fimd are enabled by fimd_enable() on this
case, it can lead IOMMU page fault. The reason is that VIDCON0_ENVID and
VIDCON0_ENVID_F bits of VIDCON0 register are set still even though fimd
is disabled, so it may continue display output of prior when clocks for
fimd are enabled again.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_fimd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index b45e09b..3b0e0f6 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -791,6 +791,8 @@ static void fimd_disable(struct exynos_drm_crtc *crtc)
 	for (i = 0; i < WINDOWS_NR; i++)
 		fimd_win_disable(crtc, i);
 
+	writel(0, ctx->regs + VIDCON0);
+
 	clk_disable_unprepare(ctx->lcd_clk);
 	clk_disable_unprepare(ctx->bus_clk);
 
-- 
1.9.1

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Re: [PATCH v2 3/3] drm/exynos: initialize VIDCON0 when fimd is disabled

[Gustavo Padovan]

Hi Joonyoung,

2015-06-12 Joonyoung Shim <jy0922.shim@samsung.com>:

> When the fimd is disabled by fimd_disable(), enabled overlay layers also
> are disabled. If clocks for fimd are enabled by fimd_enable() on this
> case, it can lead IOMMU page fault. The reason is that VIDCON0_ENVID and
> VIDCON0_ENVID_F bits of VIDCON0 register are set still even though fimd
> is disabled, so it may continue display output of prior when clocks for
> fimd are enabled again.
> 
> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_fimd.c | 2 ++
>  1 file changed, 2 insertions(+)

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

	Gustavo

Re: [PATCH v2 1/3] drm/exynos: remove to call mixer_wait_for_vblank

[Gustavo Padovan]

Hi Joonyoung,

2015-06-12 Joonyoung Shim <jy0922.shim@samsung.com>:

> The reason waiting vblank is to be power gated and disabled clocks after
> dma operation is completed. The dma operation is stopped already before
> be power gated and clocks are disabled when mixer is disabled by commit
> 381be025ac1a6("drm/exynos: stop mixer before gating clocks during
> poweroff"). Don't need to wait vblank anymore.
> 
> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_mixer.c | 1 -
>  1 file changed, 1 deletion(-)

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

	Gustavo