Re: [RFC 3/4] drm/sun4i: Reimplement plane z position setting logic

Jernej Škrabec
2019-12-29T09:40:39Z

Hi!

Dne sobota, 28. december 2019 ob 21:28:17 CET je
roman.stratiienko@globallogic.com napisal(a):
> 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");

Use drm_dbg().

> + for (i = 0; i < 4; i++) {
> + int zpos = mixer->channel_zpos[i];

channel_zpos can hold 5 elements which is also theoretical maximum for current
HW design. Why do you check only 4 elements?

It would be great to introduce a macro like SUN8I_MIXER_MAX_LAYERS so everyone
would understand where this number comes from.

> +
> + 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");

Use drm_dbg().

> 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;
> +

for loop would be better, especially using proposed macro.

Best regards,
Jernej

> /*
> * 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 = {