diff mbox series

[v1,1/4] drm/ast: Only set format registers if primary plane's format changes

Message ID 20200805105428.2590-2-tzimmermann@suse.de (mailing list archive)
State New, archived
Headers show
Series drm/ast: Disable HW cursor when switching modes | expand

Commit Message

Thomas Zimmermann Aug. 5, 2020, 10:54 a.m. UTC 
The atomic modesetting code tried to distinguish format changes from
full modesetting operations. But the implementation was buggy and the
format registers were often updated even for simple pageflips.

Fix this problem by distinguishing between format and mode changes; and
handle each in it's own branch.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 4961eb60f145 ("drm/ast: Enable atomic modesetting")
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: "Y.C. Chen" <yc_chen@aspeedtech.com>
Cc: <stable@vger.kernel.org> # v5.6+
---
 drivers/gpu/drm/ast/ast_mode.c | 52 ++++++++++++++++------------------
 1 file changed, 25 insertions(+), 27 deletions(-)

Comments

Sasha Levin Aug. 9, 2020, 3:53 p.m. UTC | #1 
Hi

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag
fixing commit: 4961eb60f145 ("drm/ast: Enable atomic modesetting").

The bot has tested the following trees: v5.8, v5.7.13.

v5.8: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")

v5.7.13: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    3a53230e1c4b ("drm/ast: Make ast_primary_plane_helper_atomic_update static")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")


NOTE: The patch will not be queued to stable trees until it is upstream.

How should we proceed with this patch?
Sasha Levin Aug. 13, 2020, 4:25 p.m. UTC | #2 
Hi

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag
fixing commit: 4961eb60f145 ("drm/ast: Enable atomic modesetting").

The bot has tested the following trees: v5.8, v5.7.14.

v5.8: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")

v5.7.14: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    3a53230e1c4b ("drm/ast: Make ast_primary_plane_helper_atomic_update static")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")


NOTE: The patch will not be queued to stable trees until it is upstream.

How should we proceed with this patch?
Sasha Levin Aug. 19, 2020, 11:57 p.m. UTC | #3 
Hi

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag
fixing commit: 4961eb60f145 ("drm/ast: Enable atomic modesetting").

The bot has tested the following trees: v5.8.1, v5.7.15.

v5.8.1: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")

v5.7.15: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    3a53230e1c4b ("drm/ast: Make ast_primary_plane_helper_atomic_update static")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")


NOTE: The patch will not be queued to stable trees until it is upstream.

How should we proceed with this patch?
Sasha Levin Aug. 26, 2020, 1:54 p.m. UTC | #4 
Hi

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag
fixing commit: 4961eb60f145 ("drm/ast: Enable atomic modesetting").

The bot has tested the following trees: v5.8.2, v5.7.16.

v5.8.2: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")

v5.7.16: Failed to apply! Possible dependencies:
    05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
    3a53230e1c4b ("drm/ast: Make ast_primary_plane_helper_atomic_update static")
    fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")


NOTE: The patch will not be queued to stable trees until it is upstream.

How should we proceed with this patch?
Thomas Zimmermann Aug. 27, 2020, 9:10 a.m. UTC | #5 
Hi

Am 26.08.20 um 15:54 schrieb Sasha Levin:
> Hi
> 
> [This is an automated email]
> 
> This commit has been processed because it contains a "Fixes:" tag
> fixing commit: 4961eb60f145 ("drm/ast: Enable atomic modesetting").
> 
> The bot has tested the following trees: v5.8.2, v5.7.16.
> 
> v5.8.2: Failed to apply! Possible dependencies:
>     05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
>     fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")
> 
> v5.7.16: Failed to apply! Possible dependencies:
>     05f13f5b5996 ("drm/ast: Remove unused code paths for AST 1180")
>     3a53230e1c4b ("drm/ast: Make ast_primary_plane_helper_atomic_update static")
>     fa7dbd768884 ("drm/ast: Upcast from DRM device to ast structure via to_ast_private()")
> 
> 
> NOTE: The patch will not be queued to stable trees until it is upstream.
> 
> How should we proceed with this patch?

Please drop this patch and the rest of the series.

>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 62fe682a7de6..b129833c0821 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -768,34 +768,32 @@  static void ast_crtc_helper_atomic_flush(struct drm_crtc *crtc,
 {
 	struct drm_device *dev = crtc->dev;
 	struct ast_private *ast = to_ast_private(dev);
-	struct ast_crtc_state *ast_state;
-	const struct drm_format_info *format;
-	struct ast_vbios_mode_info *vbios_mode_info;
-	struct drm_display_mode *adjusted_mode;
-
-	ast_state = to_ast_crtc_state(crtc->state);
-
-	format = ast_state->format;
-	if (!format)
-		return;
-
-	vbios_mode_info = &ast_state->vbios_mode_info;
-
-	ast_set_color_reg(ast, format);
-	ast_set_vbios_color_reg(ast, format, vbios_mode_info);
-
-	if (!crtc->state->mode_changed)
-		return;
-
-	adjusted_mode = &crtc->state->adjusted_mode;
+	struct drm_crtc_state *crtc_state = crtc->state;
+	struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state);
+	struct ast_crtc_state *old_ast_crtc_state =
+		to_ast_crtc_state(old_crtc_state);
+	const struct drm_format_info *format = ast_crtc_state->format;
+	struct ast_vbios_mode_info *vbios_mode_info =
+		&ast_crtc_state->vbios_mode_info;
+	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+
+	if (drm_WARN_ON_ONCE(dev, !format))
+		return; /* BUG: We didn't set format in primary check(). */
+
+	if (format != old_ast_crtc_state->format) {
+		ast_set_color_reg(ast, format);
+		ast_set_vbios_color_reg(ast, format, vbios_mode_info);
+	}
 
-	ast_set_vbios_mode_reg(ast, adjusted_mode, vbios_mode_info);
-	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x06);
-	ast_set_std_reg(ast, adjusted_mode, vbios_mode_info);
-	ast_set_crtc_reg(ast, adjusted_mode, vbios_mode_info);
-	ast_set_dclk_reg(ast, adjusted_mode, vbios_mode_info);
-	ast_set_crtthd_reg(ast);
-	ast_set_sync_reg(ast, adjusted_mode, vbios_mode_info);
+	if (drm_atomic_crtc_needs_modeset(crtc_state)) {
+		ast_set_vbios_mode_reg(ast, adjusted_mode, vbios_mode_info);
+		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x06);
+		ast_set_std_reg(ast, adjusted_mode, vbios_mode_info);
+		ast_set_crtc_reg(ast, adjusted_mode, vbios_mode_info);
+		ast_set_dclk_reg(ast, adjusted_mode, vbios_mode_info);
+		ast_set_crtthd_reg(ast);
+		ast_set_sync_reg(ast, adjusted_mode, vbios_mode_info);
+	}
 }
 
 static void