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[178.79.73.218]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-475dd4924e2sm149902535e9.8.2025.10.27.11.13.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Oct 2025 11:13:20 -0700 (PDT) From: Jernej =?UTF-8?B?xaBrcmFiZWM=?= To: wens@csie.org Cc: mripard@kernel.org, maarten.lankhorst@linux.intel.com, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, samuel@sholland.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH 08/30] drm/sun4i: ui layer: Write attributes in one go Date: Mon, 27 Oct 2025 19:13:19 +0100 Message-ID: <10742932.nUPlyArG6x@jernej-laptop> In-Reply-To: References: <20251012192330.6903-1-jernej.skrabec@gmail.com> <20251012192330.6903-9-jernej.skrabec@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Dne ponedeljek, 27. oktober 2025 ob 17:04:38 Srednjeevropski standardni =C4= =8Das je Chen-Yu Tsai napisal(a): > On Mon, Oct 13, 2025 at 3:23=E2=80=AFAM Jernej Skrabec wrote: > > > > It turns out that none of the UI channel registers were meant to be > > read. Mostly it works fine but sometimes it returns incorrect values. > > > > Rework UI layer code to write all registers in one go to avoid reads. > > > > This rework will also allow proper code separation. > > > > Signed-off-by: Jernej Skrabec >=20 > Reviewed-by: Chen-Yu Tsai >=20 > > --- > > drivers/gpu/drm/sun4i/sun8i_ui_layer.c | 50 +++++++++----------------- > > 1 file changed, 16 insertions(+), 34 deletions(-) > > > > diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c b/drivers/gpu/drm/s= un4i/sun8i_ui_layer.c > > index 12c83c54f9bc..8634d2ee613a 100644 > > --- a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c > > +++ b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c > > @@ -25,25 +25,27 @@ > > #include "sun8i_ui_scaler.h" > > #include "sun8i_vi_scaler.h" > > > > -static void sun8i_ui_layer_update_alpha(struct sun8i_mixer *mixer, int= channel, > > - int overlay, struct drm_plane *= plane) > > +static void sun8i_ui_layer_update_attributes(struct sun8i_mixer *mixer, > > + int channel, int overlay, > > + struct drm_plane *plane) > > { > > - u32 mask, val, ch_base; > > + struct drm_plane_state *state =3D plane->state; > > + const struct drm_format_info *fmt; > > + u32 val, ch_base, hw_fmt; > > > > ch_base =3D sun8i_channel_base(mixer, channel); > > + fmt =3D state->fb->format; > > + sun8i_mixer_drm_format_to_hw(fmt->format, &hw_fmt); > > > > - mask =3D SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK | > > - SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK; > > - > > - val =3D SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA(plane->state->alph= a >> 8); > > - > > - val |=3D (plane->state->alpha =3D=3D DRM_BLEND_ALPHA_OPAQUE) ? > > + val =3D SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA(state->alpha >> 8); > > + val |=3D (state->alpha =3D=3D DRM_BLEND_ALPHA_OPAQUE) ? >=20 > Changing "plane->state" to "state" made the diff somewhat harder to read. Do you prefer that I change that in next revision? Best regards, Jernej >=20 > > SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_PIXEL : > > SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_COMBINED; > > + val |=3D hw_fmt << SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_OFFSET; > > + val |=3D SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN; > > > > - regmap_update_bits(mixer->engine.regs, > > - SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch_base, over= lay), > > - mask, val); > > + regmap_write(mixer->engine.regs, > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch_base, overlay), = val); > > } > > > > static void sun8i_ui_layer_update_coord(struct sun8i_mixer *mixer, int= channel, > > @@ -111,24 +113,6 @@ static void sun8i_ui_layer_update_coord(struct sun= 8i_mixer *mixer, int channel, > > } > > } > > > > -static void sun8i_ui_layer_update_formats(struct sun8i_mixer *mixer, i= nt channel, > > - int overlay, struct drm_plane= *plane) > > -{ > > - struct drm_plane_state *state =3D plane->state; > > - const struct drm_format_info *fmt; > > - u32 val, ch_base, hw_fmt; > > - > > - ch_base =3D sun8i_channel_base(mixer, channel); > > - > > - fmt =3D state->fb->format; > > - sun8i_mixer_drm_format_to_hw(fmt->format, &hw_fmt); > > - > > - val =3D hw_fmt << SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_OFFSET; > > - regmap_update_bits(mixer->engine.regs, > > - SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch_base, over= lay), > > - SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK, v= al); > > -} > > - > > static void sun8i_ui_layer_update_buffer(struct sun8i_mixer *mixer, in= t channel, > > int overlay, struct drm_plane = *plane) > > { > > @@ -220,12 +204,10 @@ static void sun8i_ui_layer_atomic_update(struct d= rm_plane *plane, > > if (!new_state->crtc || !new_state->visible) > > return; > > > > + sun8i_ui_layer_update_attributes(mixer, layer->channel, > > + layer->overlay, plane); > > sun8i_ui_layer_update_coord(mixer, layer->channel, > > layer->overlay, plane); > > - sun8i_ui_layer_update_alpha(mixer, layer->channel, > > - layer->overlay, plane); > > - sun8i_ui_layer_update_formats(mixer, layer->channel, > > - layer->overlay, plane); > > sun8i_ui_layer_update_buffer(mixer, layer->channel, > > layer->overlay, plane); > > } > > -- > > 2.51.0 > > > > >=20