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Subject[RFC 3/4] drm/sun4i: Reimplement plane z position setting logic
Date
From: Roman Stratiienko <roman.stratiienko@globallogic.com>

To set blending channel order register software needs to know state and
position of each channel, which impossible at plane commit stage.

Move this procedure to atomic_flush stage, where all necessary information
is available.

Signed-off-by: Roman Stratiienko <roman.stratiienko@globallogic.com>
---
drivers/gpu/drm/sun4i/sun8i_mixer.c | 47 +++++++++++++++++++++++++-
drivers/gpu/drm/sun4i/sun8i_mixer.h | 3 ++
drivers/gpu/drm/sun4i/sun8i_ui_layer.c | 42 ++++-------------------
drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 39 +++------------------
4 files changed, 60 insertions(+), 71 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index bb9a665fd053..da84fccf7784 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -307,8 +307,47 @@ static void sun8i_atomic_begin(struct sunxi_engine *engine,

static void sun8i_mixer_commit(struct sunxi_engine *engine)
{
- DRM_DEBUG_DRIVER("Committing changes\n");
+ struct sun8i_mixer *mixer = engine_to_sun8i_mixer(engine);
+ u32 base = sun8i_blender_base(mixer);
+ int i, j;
+ int channel_by_zpos[4] = {-1, -1, -1, -1};
+ u32 route = 0, pipe_ctl = 0;
+
+ DRM_DEBUG_DRIVER("Update blender routing\n");
+ for (i = 0; i < 4; i++) {
+ int zpos = mixer->channel_zpos[i];
+
+ if (zpos >= 0 && zpos < 4)
+ channel_by_zpos[zpos] = i;
+ }
+
+ j = 0;
+ for (i = 0; i < 4; i++) {
+ int ch = channel_by_zpos[i];
+
+ if (ch >= 0) {
+ pipe_ctl |= SUN8I_MIXER_BLEND_PIPE_CTL_EN(j);
+ route |= ch << SUN8I_MIXER_BLEND_ROUTE_PIPE_SHIFT(j);
+ j++;
+ }
+ }
+
+ for (i = 0; i < 4 && j < 4; i++) {
+ int zpos = mixer->channel_zpos[i];

+ if (zpos < 0) {
+ route |= i << SUN8I_MIXER_BLEND_ROUTE_PIPE_SHIFT(j);
+ j++;
+ }
+ }
+
+ regmap_update_bits(mixer->engine.regs, SUN8I_MIXER_BLEND_PIPE_CTL(base),
+ SUN8I_MIXER_BLEND_PIPE_CTL_EN_MSK, pipe_ctl);
+
+ regmap_write(mixer->engine.regs,
+ SUN8I_MIXER_BLEND_ROUTE(base), route);
+
+ DRM_DEBUG_DRIVER("Committing changes\n");
regmap_write(engine->regs, SUN8I_MIXER_GLOBAL_DBUFF,
SUN8I_MIXER_GLOBAL_DBUFF_ENABLE);
}
@@ -422,6 +461,12 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
mixer->engine.ops = &sun8i_engine_ops;
mixer->engine.node = dev->of_node;

+ mixer->channel_zpos[0] = -1;
+ mixer->channel_zpos[1] = -1;
+ mixer->channel_zpos[2] = -1;
+ mixer->channel_zpos[3] = -1;
+ mixer->channel_zpos[4] = -1;
+
/*
* While this function can fail, we shouldn't do anything
* if this happens. Some early DE2 DT entries don't provide
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
index 915479cc3077..9c2ff87923d8 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -178,6 +178,9 @@ struct sun8i_mixer {

struct clk *bus_clk;
struct clk *mod_clk;
+
+ /* -1 means that layer is disabled */
+ int channel_zpos[5];
};

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 893076716070..23c2f4b68c89 100644
--- a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
@@ -24,12 +24,10 @@
#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;
+ u32 val, ch_base;

- bld_base = sun8i_blender_base(mixer);
ch_base = sun8i_channel_base(mixer, channel);

DRM_DEBUG_DRIVER("%sabling channel %d overlay %d\n",
@@ -44,32 +42,7 @@ 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);
-
- 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);
- }
+ mixer->channel_zpos[channel] = enable ? zpos : -1;
}

static int sun8i_ui_layer_update_coord(struct sun8i_mixer *mixer, int channel,
@@ -235,11 +208,9 @@ static void sun8i_ui_layer_atomic_disable(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
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);
+ sun8i_ui_layer_enable(mixer, layer->channel, layer->overlay, false, 0);
}

static void sun8i_ui_layer_atomic_update(struct drm_plane *plane,
@@ -247,12 +218,11 @@ static void sun8i_ui_layer_atomic_update(struct drm_plane *plane,
{
struct sun8i_ui_layer *layer = plane_to_sun8i_ui_layer(plane);
unsigned int zpos = plane->state->normalized_zpos;
- unsigned int old_zpos = old_state->normalized_zpos;
struct sun8i_mixer *mixer = layer->mixer;

if (!plane->state->visible) {
sun8i_ui_layer_enable(mixer, layer->channel,
- layer->overlay, false, 0, old_zpos);
+ layer->overlay, false, 0);
return;
}

@@ -263,7 +233,7 @@ 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 struct drm_plane_helper_funcs sun8i_ui_layer_helper_funcs = {
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
index 42d445d23773..97cbc98bf781 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
@@ -17,8 +17,7 @@
#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;

@@ -37,32 +36,7 @@ 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);
- }
-
- 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);
- }
+ mixer->channel_zpos[channel] = enable ? zpos : -1;
}

static int sun8i_vi_layer_update_coord(struct sun8i_mixer *mixer, int channel,
@@ -350,11 +324,9 @@ static void sun8i_vi_layer_atomic_disable(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
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);
+ sun8i_vi_layer_enable(mixer, layer->channel, layer->overlay, false, 0);
}

static void sun8i_vi_layer_atomic_update(struct drm_plane *plane,
@@ -362,12 +334,11 @@ static void sun8i_vi_layer_atomic_update(struct drm_plane *plane,
{
struct sun8i_vi_layer *layer = plane_to_sun8i_vi_layer(plane);
unsigned int zpos = plane->state->normalized_zpos;
- unsigned int old_zpos = old_state->normalized_zpos;
struct sun8i_mixer *mixer = layer->mixer;

if (!plane->state->visible) {
sun8i_vi_layer_enable(mixer, layer->channel,
- layer->overlay, false, 0, old_zpos);
+ layer->overlay, false, 0);
return;
}

@@ -378,7 +349,7 @@ 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 struct drm_plane_helper_funcs sun8i_vi_layer_helper_funcs = {
--
2.17.1
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