[PATCH] drm/sun4i: Fix blend route/enable register corruption for DE2.0/DE3.0
From: Roman Stratiienko
Date: Wed May 25 2022 - 07:55:02 EST
By this commit 2 related issues are solved:
Issue #1. Corruption in blend route/enable register:
Register corruption happens after using old_state->zpos to disable layer
state. Blend route/enable registers are shared with other layers
and other layers may have already assigned this PIPE to valid value.
Solution: Do not use old_state->zpos to disable the plane pipe in
blend registers.
Issue #2. Remove disabled layer from blend route/enable registers:
Since sun4i/drm are using normalized_zpos, .atomic_update() will setup
blend route/enable pipes starting from PIPE0 to PIPEX, where X+1 is a
number of layers used by the CRTC in this frame.
Remaining pipes (PIPE[X+1] - PIPE[MAX]) can have old data that MUST be
updated.
new_state->normalized_zpos can't be used, since drm helpers won't update
it for disabled planes.
Solution:
1. Track the number of total used planes for crtc.
2. Use this number instead of zpos to disable unused blend pipes.
Signed-off-by: Roman Stratiienko <roman.o.stratiienko@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/sun4i/sun8i_mixer.h | 2 +
drivers/gpu/drm/sun4i/sun8i_ui_layer.c | 60 +++++++++-----------------
drivers/gpu/drm/sun4i/sun8i_ui_layer.h | 2 +
drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 58 +++++++++----------------
drivers/gpu/drm/sun4i/sun8i_vi_layer.h | 2 +
5 files changed, 47 insertions(+), 77 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
index 5b3fbee18671..ebfc276b2464 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -177,6 +177,8 @@ struct sun8i_mixer {
struct clk *bus_clk;
struct clk *mod_clk;
+
+ int used_layers;
};
static inline struct sun8i_mixer *
diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
index 7845c2a53a7f..ca79cb4d5c04 100644
--- a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
@@ -24,8 +24,7 @@
#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)
+ int overlay, bool enable, unsigned int zpos)
{
u32 val, bld_base, ch_base;
@@ -44,32 +43,18 @@ static void sun8i_ui_layer_enable(struct sun8i_mixer *mixer, int channel,
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);
+ val = SUN8I_MIXER_BLEND_PIPE_CTL_EN(zpos);
- regmap_update_bits(mixer->engine.regs,
- SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
- val, val);
+ regmap_update_bits(mixer->engine.regs,
+ SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
+ val, enable ? val : 0);
- val = channel << SUN8I_MIXER_BLEND_ROUTE_PIPE_SHIFT(zpos);
+ 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);
- }
+ 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,
@@ -291,32 +276,29 @@ static int sun8i_ui_layer_atomic_check(struct drm_plane *plane,
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_ui_layer *layer = plane_to_sun8i_ui_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);
+ if (layer->en_state) {
+ layer->en_state = false;
+ mixer->used_layers--;
+ sun8i_ui_layer_enable(mixer, layer->channel, layer->overlay, false,
+ mixer->used_layers);
+ }
}
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);
+ plane);
struct sun8i_ui_layer *layer = plane_to_sun8i_ui_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);
- return;
+ if (!layer->en_state) {
+ layer->en_state = true;
+ mixer->used_layers++;
}
sun8i_ui_layer_update_coord(mixer, layer->channel,
@@ -328,7 +310,7 @@ static void sun8i_ui_layer_atomic_update(struct drm_plane *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);
+ true, zpos);
}
static const struct drm_plane_helper_funcs sun8i_ui_layer_helper_funcs = {
diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_layer.h b/drivers/gpu/drm/sun4i/sun8i_ui_layer.h
index e3e32ee1178d..43c48cf7bc51 100644
--- a/drivers/gpu/drm/sun4i/sun8i_ui_layer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_ui_layer.h
@@ -53,6 +53,8 @@ struct sun8i_ui_layer {
struct sun8i_mixer *mixer;
int channel;
int overlay;
+
+ bool en_state;
};
static inline struct sun8i_ui_layer *
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
index bb7c43036dfa..662ba1018cc4 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
@@ -18,8 +18,7 @@
#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)
+ int overlay, bool enable, unsigned int zpos)
{
u32 val, bld_base, ch_base;
@@ -38,32 +37,18 @@ static void sun8i_vi_layer_enable(struct sun8i_mixer *mixer, int channel,
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);
- }
+ val = SUN8I_MIXER_BLEND_PIPE_CTL_EN(zpos);
- 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);
+ regmap_update_bits(mixer->engine.regs,
+ SUN8I_MIXER_BLEND_PIPE_CTL(bld_base),
+ val, enable ? val : 0);
- val = channel << SUN8I_MIXER_BLEND_ROUTE_PIPE_SHIFT(zpos);
+ 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);
- }
+ 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,
@@ -395,32 +380,29 @@ static int sun8i_vi_layer_atomic_check(struct drm_plane *plane,
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_vi_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);
+ if (layer->en_state) {
+ layer->en_state = false;
+ mixer->used_layers--;
+ sun8i_vi_layer_enable(mixer, layer->channel, layer->overlay, false,
+ mixer->used_layers);
+ }
}
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_vi_layer *layer = plane_to_sun8i_vi_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);
- return;
+ if (!layer->en_state) {
+ layer->en_state = true;
+ mixer->used_layers++;
}
sun8i_vi_layer_update_coord(mixer, layer->channel,
@@ -432,7 +414,7 @@ static void sun8i_vi_layer_atomic_update(struct drm_plane *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);
+ true, zpos);
}
static const struct drm_plane_helper_funcs sun8i_vi_layer_helper_funcs = {
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
index 48c399e1c86d..9939a4cc7a52 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
@@ -58,6 +58,8 @@ struct sun8i_vi_layer {
struct sun8i_mixer *mixer;
int channel;
int overlay;
+
+ bool en_state;
};
static inline struct sun8i_vi_layer *
--
2.30.2