[PATCH 3/3] drm/sun4i: Fix layer zpos change/atomic modesetting
From: Ondřej Jirman
Date: Fri Feb 16 2024 - 14:05:31 EST
From: Ondrej Jirman <megi@xxxxxx>
Identical configurations of planes can lead to different (and wrong)
layer -> pipe routing at HW level, depending on the order of atomic
plane changes.
For example:
- Layer 1 is configured to zpos 0 and thus uses pipe 0. No other layer
is enabled. This is a typical situation at boot.
- When a compositor takes over and layer 3 is enabled,
sun8i_ui_layer_enable() will get called with old_zpos=0 zpos=1, which
will lead to incorrect disabling of pipe 0 and enabling of pipe 1.
What happens is that sun8i_ui_layer_enable() function may disable
blender pipes even if it is no longer assigned to its layer.
To correct this, move the routing setup out of individual plane's
atomic_update into crtc's atomic_update, where it can be calculated
and updated all at once.
Remove the atomic_disable callback because it is no longer needed.
Signed-off-by: Ondrej Jirman <megi@xxxxxx>
---
drivers/gpu/drm/sun4i/sun8i_mixer.c | 73 +++++++++++++++++++++++++
drivers/gpu/drm/sun4i/sun8i_mixer.h | 6 +++
drivers/gpu/drm/sun4i/sun8i_ui_layer.c | 73 +------------------------
drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 74 +-------------------------
4 files changed, 83 insertions(+), 143 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index bdeb9b80e038..21331d4ffe01 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -250,12 +250,85 @@ int sun8i_mixer_drm_format_to_hw(u32 format, u32 *hw_format)
return -EINVAL;
}
+static void sun8i_layer_enable(struct sun8i_layer *layer, bool enable)
+{
+ u32 ch_base = sun8i_channel_base(layer->mixer, layer->channel);
+ u32 val, reg, mask;
+
+ if (layer->type == SUN8I_LAYER_TYPE_UI) {
+ val = enable ? SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN : 0;
+ mask = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;
+ reg = SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch_base, layer->overlay);
+ } else {
+ val = enable ? SUN8I_MIXER_CHAN_VI_LAYER_ATTR_EN : 0;
+ mask = SUN8I_MIXER_CHAN_VI_LAYER_ATTR_EN;
+ reg = SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base, layer->overlay);
+ }
+
+ regmap_update_bits(layer->mixer->engine.regs, reg, mask, val);
+}
+
static void sun8i_mixer_commit(struct sunxi_engine *engine,
struct drm_crtc *crtc,
struct drm_atomic_state *state)
{
+ struct sun8i_mixer *mixer = engine_to_sun8i_mixer(engine);
+ u32 bld_base = sun8i_blender_base(mixer);
+ struct drm_plane_state *plane_state;
+ struct drm_plane *plane;
+ u32 route = 0, pipe_en = 0;
+
DRM_DEBUG_DRIVER("Committing changes\n");
+ drm_for_each_plane(plane, state->dev) {
+ struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
+ bool enable;
+ int zpos;
+
+ if (!(plane->possible_crtcs & drm_crtc_mask(crtc)) || layer->mixer != mixer)
+ continue;
+
+ plane_state = drm_atomic_get_new_plane_state(state, plane);
+ if (!plane_state)
+ plane_state = plane->state;
+
+ enable = plane_state->crtc && plane_state->visible;
+ zpos = plane_state->normalized_zpos;
+
+ DRM_DEBUG_DRIVER(" plane %d: chan=%d ovl=%d en=%d zpos=%d\n",
+ plane->base.id, layer->channel, layer->overlay,
+ enable, zpos);
+
+ /*
+ * We always update the layer enable bit, because it can clear
+ * spontaneously for unknown reasons.
+ */
+ sun8i_layer_enable(layer, enable);
+
+ if (!enable)
+ continue;
+
+ /* Route layer to pipe based on zpos */
+ route |= layer->channel << SUN8I_MIXER_BLEND_ROUTE_PIPE_SHIFT(zpos);
+ pipe_en |= SUN8I_MIXER_BLEND_PIPE_CTL_EN(zpos);
+ }
+
+ regmap_update_bits(mixer->engine.regs,
+ SUN8I_MIXER_BLEND_ROUTE(bld_base),
+ SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(0) |
+ SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(1) |
+ SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(2) |
+ SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(3),
+ route);
+
+ regmap_update_bits(mixer->engine.regs,
+ SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
+ SUN8I_MIXER_BLEND_PIPE_CTL_EN(0) |
+ SUN8I_MIXER_BLEND_PIPE_CTL_EN(1) |
+ SUN8I_MIXER_BLEND_PIPE_CTL_EN(2) |
+ SUN8I_MIXER_BLEND_PIPE_CTL_EN(3),
+ pipe_en);
+
regmap_write(engine->regs, SUN8I_MIXER_GLOBAL_DBUFF,
SUN8I_MIXER_GLOBAL_DBUFF_ENABLE);
}
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
index 5a610ee30301..d7898c9c9cc0 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -186,9 +186,15 @@ struct sun8i_mixer {
struct clk *mod_clk;
};
+enum {
+ SUN8I_LAYER_TYPE_UI,
+ SUN8I_LAYER_TYPE_VI,
+};
+
struct sun8i_layer {
struct drm_plane plane;
struct sun8i_mixer *mixer;
+ int type;
int channel;
int overlay;
};
diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
index 248fbb606ede..b90e5edef4e8 100644
--- a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
@@ -24,55 +24,6 @@
#include "sun8i_ui_layer.h"
#include "sun8i_ui_scaler.h"
-static void sun8i_ui_layer_enable(struct sun8i_mixer *mixer, int channel,
- int overlay, bool enable, unsigned int zpos,
- unsigned int old_zpos)
-{
- u32 val, bld_base, ch_base;
-
- bld_base = sun8i_blender_base(mixer);
- ch_base = sun8i_channel_base(mixer, channel);
-
- DRM_DEBUG_DRIVER("%sabling channel %d overlay %d\n",
- enable ? "En" : "Dis", channel, overlay);
-
- if (enable)
- val = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;
- else
- val = 0;
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch_base, overlay),
- SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN, val);
-
- if (!enable || zpos != old_zpos) {
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
- SUN8I_MIXER_BLEND_PIPE_CTL_EN(old_zpos),
- 0);
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_ROUTE(bld_base),
- SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(old_zpos),
- 0);
- }
-
- if (enable) {
- val = SUN8I_MIXER_BLEND_PIPE_CTL_EN(zpos);
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
- val, val);
-
- val = channel << SUN8I_MIXER_BLEND_ROUTE_PIPE_SHIFT(zpos);
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_ROUTE(bld_base),
- SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(zpos),
- val);
- }
-}
-
static void sun8i_ui_layer_update_alpha(struct sun8i_mixer *mixer, int channel,
int overlay, struct drm_plane *plane)
{
@@ -259,36 +210,18 @@ static int sun8i_ui_layer_atomic_check(struct drm_plane *plane,
true, true);
}
-static void sun8i_ui_layer_atomic_disable(struct drm_plane *plane,
- struct drm_atomic_state *state)
-{
- struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
- plane);
- struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
- unsigned int old_zpos = old_state->normalized_zpos;
- struct sun8i_mixer *mixer = layer->mixer;
-
- sun8i_ui_layer_enable(mixer, layer->channel, layer->overlay, false, 0,
- old_zpos);
-}
static void sun8i_ui_layer_atomic_update(struct drm_plane *plane,
struct drm_atomic_state *state)
{
- struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
- plane);
struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
plane);
struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
unsigned int zpos = new_state->normalized_zpos;
- unsigned int old_zpos = old_state->normalized_zpos;
struct sun8i_mixer *mixer = layer->mixer;
- if (!new_state->visible) {
- sun8i_ui_layer_enable(mixer, layer->channel,
- layer->overlay, false, 0, old_zpos);
+ if (!new_state->crtc || !new_state->visible)
return;
- }
sun8i_ui_layer_update_coord(mixer, layer->channel,
layer->overlay, plane, zpos);
@@ -298,13 +231,10 @@ static void sun8i_ui_layer_atomic_update(struct drm_plane *plane,
layer->overlay, plane);
sun8i_ui_layer_update_buffer(mixer, layer->channel,
layer->overlay, plane);
- sun8i_ui_layer_enable(mixer, layer->channel, layer->overlay,
- true, zpos, old_zpos);
}
static const struct drm_plane_helper_funcs sun8i_ui_layer_helper_funcs = {
.atomic_check = sun8i_ui_layer_atomic_check,
- .atomic_disable = sun8i_ui_layer_atomic_disable,
.atomic_update = sun8i_ui_layer_atomic_update,
};
@@ -390,6 +320,7 @@ struct sun8i_layer *sun8i_ui_layer_init_one(struct drm_device *drm,
drm_plane_helper_add(&layer->plane, &sun8i_ui_layer_helper_funcs);
layer->mixer = mixer;
+ layer->type = SUN8I_LAYER_TYPE_UI;
layer->channel = channel;
layer->overlay = 0;
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
index 0c0f1ac80517..9c09d9c08496 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
@@ -18,55 +18,6 @@
#include "sun8i_vi_layer.h"
#include "sun8i_vi_scaler.h"
-static void sun8i_vi_layer_enable(struct sun8i_mixer *mixer, int channel,
- int overlay, bool enable, unsigned int zpos,
- unsigned int old_zpos)
-{
- u32 val, bld_base, ch_base;
-
- bld_base = sun8i_blender_base(mixer);
- ch_base = sun8i_channel_base(mixer, channel);
-
- DRM_DEBUG_DRIVER("%sabling VI channel %d overlay %d\n",
- enable ? "En" : "Dis", channel, overlay);
-
- if (enable)
- val = SUN8I_MIXER_CHAN_VI_LAYER_ATTR_EN;
- else
- val = 0;
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base, overlay),
- SUN8I_MIXER_CHAN_VI_LAYER_ATTR_EN, val);
-
- if (!enable || zpos != old_zpos) {
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
- SUN8I_MIXER_BLEND_PIPE_CTL_EN(old_zpos),
- 0);
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_ROUTE(bld_base),
- SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(old_zpos),
- 0);
- }
-
- if (enable) {
- val = SUN8I_MIXER_BLEND_PIPE_CTL_EN(zpos);
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
- val, val);
-
- val = channel << SUN8I_MIXER_BLEND_ROUTE_PIPE_SHIFT(zpos);
-
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_ROUTE(bld_base),
- SUN8I_MIXER_BLEND_ROUTE_PIPE_MSK(zpos),
- val);
- }
-}
-
static void sun8i_vi_layer_update_alpha(struct sun8i_mixer *mixer, int channel,
int overlay, struct drm_plane *plane)
{
@@ -393,36 +344,17 @@ static int sun8i_vi_layer_atomic_check(struct drm_plane *plane,
true, true);
}
-static void sun8i_vi_layer_atomic_disable(struct drm_plane *plane,
- struct drm_atomic_state *state)
-{
- struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
- plane);
- struct sun8i_layer *layer = plane_to_sun8i_vi_layer(plane);
- unsigned int old_zpos = old_state->normalized_zpos;
- struct sun8i_mixer *mixer = layer->mixer;
-
- sun8i_vi_layer_enable(mixer, layer->channel, layer->overlay, false, 0,
- old_zpos);
-}
-
static void sun8i_vi_layer_atomic_update(struct drm_plane *plane,
struct drm_atomic_state *state)
{
- struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
- plane);
struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
plane);
struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
unsigned int zpos = new_state->normalized_zpos;
- unsigned int old_zpos = old_state->normalized_zpos;
struct sun8i_mixer *mixer = layer->mixer;
- if (!new_state->visible) {
- sun8i_vi_layer_enable(mixer, layer->channel,
- layer->overlay, false, 0, old_zpos);
+ if (!new_state->crtc || !new_state->visible)
return;
- }
sun8i_vi_layer_update_coord(mixer, layer->channel,
layer->overlay, plane, zpos);
@@ -432,13 +364,10 @@ static void sun8i_vi_layer_atomic_update(struct drm_plane *plane,
layer->overlay, plane);
sun8i_vi_layer_update_buffer(mixer, layer->channel,
layer->overlay, plane);
- sun8i_vi_layer_enable(mixer, layer->channel, layer->overlay,
- true, zpos, old_zpos);
}
static const struct drm_plane_helper_funcs sun8i_vi_layer_helper_funcs = {
.atomic_check = sun8i_vi_layer_atomic_check,
- .atomic_disable = sun8i_vi_layer_atomic_disable,
.atomic_update = sun8i_vi_layer_atomic_update,
};
@@ -613,6 +542,7 @@ struct sun8i_layer *sun8i_vi_layer_init_one(struct drm_device *drm,
drm_plane_helper_add(&layer->plane, &sun8i_vi_layer_helper_funcs);
layer->mixer = mixer;
+ layer->type = SUN8I_LAYER_TYPE_VI;
layer->channel = index;
layer->overlay = 0;
--
2.43.0