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SubjectRe: [RFC 3/4] drm/sun4i: Reimplement plane z position setting logic
Hello Jernej,

Thank you for review.

On Sun, Dec 29, 2019 at 11:40 AM Jernej Škrabec <jernej.skrabec@siol.net> wrote:
>
> 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?
>

I'll use plane_cnt as it done in mixer_bind

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

Will do.

>
> > +
> > + 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().

According to https://github.com/torvalds/linux/commit/99a954874e7b9f0c8058476575593b3beb5731a5#diff-b0cd2d683c6afbab7bd54173cfd3d3ecR289
,
DRM_DEBUG_DRIVER uses drm_dbg.
Also, using drm_dbg with category macro would require larger indent,
making harder to fit in 80 chars limit.
Are there any plans to deprecate DRM_DEBUG_DRIVER macro?

>
> > 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.

I'll put it into already existent for-loop below.

>
> 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 = {
>
>
>
>


--
Best regards,
Roman Stratiienko
Global Logic Inc.

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