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Message-ID: <20230921114845.7edb1d37@eldfell>
Date: Thu, 21 Sep 2023 11:48:45 +0300
From: Pekka Paalanen <ppaalanen@...il.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
Jonathan Corbet <corbet@....net>,
Sandy Huang <hjc@...k-chips.com>,
Heiko Stübner <heiko@...ech.de>,
Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Hans Verkuil <hverkuil@...all.nl>,
dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH RFC v2 05/37] drm/connector: hdmi: Add output BPC to the
connector state
On Wed, 20 Sep 2023 16:35:20 +0200
Maxime Ripard <mripard@...nel.org> wrote:
> We'll add automatic selection of the output BPC in a following patch,
> but let's add it to the HDMI connector state already.
>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---
> drivers/gpu/drm/drm_atomic.c | 4 +++-
> drivers/gpu/drm/drm_atomic_state_helper.c | 6 +++++-
> drivers/gpu/drm/drm_connector.c | 13 ++++++++++++-
> include/drm/drm_connector.h | 13 ++++++++++++-
> 4 files changed, 32 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index b1b56dcaa76b..8dce0a2f2ac3 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1143,9 +1143,11 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
> drm_printf(p, "\tcolorspace=%s\n", drm_get_colorspace_name(state->colorspace));
>
> if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
> - connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)
> + connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) {
> drm_printf(p, "\tbroadcast_rgb=%s\n",
> drm_hdmi_connector_get_broadcast_rgb_name(state->hdmi.broadcast_rgb));
> + drm_printf(p, "\toutput_bpc=%u\n", state->hdmi.output_bpc);
> + }
>
> if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
> if (state->writeback_job && state->writeback_job->fb)
> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> index 0f7e5ba555b8..2c9b52ae1b56 100644
> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> @@ -569,6 +569,9 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
> void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector,
> struct drm_connector_state *new_state)
> {
> + new_state->max_bpc = 8;
> + new_state->max_requested_bpc = 8;
> + new_state->hdmi.output_bpc = 8;
Hi,
will this be forcing all drivers using these helpers to default to max bpc = 8?
I believe at least amdgpu would disagree. The defaults were changed in
the recent years, IIRC to avoid extra modesets during boot-up when
desktops prefer highest possible bpc for a mode.
The 'max bpc' property itself is a manual workaround for faulty
hardware that does not correctly indicate the max bpc it can handle. It
should not default to be a limiting factor.
> new_state->hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
> }
> EXPORT_SYMBOL(__drm_atomic_helper_connector_hdmi_reset);
> @@ -651,7 +654,8 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
> struct drm_connector_state *new_state =
> drm_atomic_get_new_connector_state(state, connector);
>
> - if (old_state->hdmi.broadcast_rgb != new_state->hdmi.broadcast_rgb) {
> + if (old_state->hdmi.broadcast_rgb != new_state->hdmi.broadcast_rgb ||
> + old_state->hdmi.output_bpc != new_state->hdmi.output_bpc) {
> struct drm_crtc *crtc = new_state->crtc;
> struct drm_crtc_state *crtc_state;
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index b45471d540ac..f55f5918411c 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -459,6 +459,7 @@ EXPORT_SYMBOL(drmm_connector_init);
> * @funcs: callbacks for this connector
> * @connector_type: user visible type of the connector
> * @ddc: optional pointer to the associated ddc adapter
> + * @max_bpc: Maximum bits per char the HDMI connector supports
> *
> * Initialises a preallocated HDMI connector. Connectors can be
> * subclassed as part of driver connector objects.
> @@ -475,7 +476,8 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
> struct drm_connector *connector,
> const struct drm_connector_funcs *funcs,
> int connector_type,
> - struct i2c_adapter *ddc)
> + struct i2c_adapter *ddc,
> + unsigned int max_bpc)
> {
> int ret;
>
> @@ -487,6 +489,15 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
> if (ret)
> return ret;
>
> + if (max_bpc) {
> + if (!(max_bpc == 8 || max_bpc == 10 || max_bpc == 12))
> + return -EINVAL;
> +
> + drm_connector_attach_hdr_output_metadata_property(connector);
> + drm_connector_attach_max_bpc_property(connector, 8, max_bpc);
> + connector->max_bpc = max_bpc;
> + }
> +
> return 0;
> }
> EXPORT_SYMBOL(drmm_connector_hdmi_init);
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index fdcf64ab91a9..d0bcb835c857 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1056,6 +1056,11 @@ struct drm_connector_state {
> * Broadcast RGB selection value.
> */
> enum drm_hdmi_broadcast_rgb broadcast_rgb;
> +
> + /**
> + * @output_bpc: Bits per character to output.
Is it not bits per channel?
> + */
> + unsigned int output_bpc;
> } hdmi;
> };
>
> @@ -1700,6 +1705,11 @@ struct drm_connector {
> */
> struct drm_property_blob *path_blob_ptr;
>
> + /**
> + * @max_bpc: Maximum bits per character the connector supports.
channel?
> + */
> + unsigned int max_bpc;
> +
> /**
> * @max_bpc_property: Default connector property for the max bpc to be
> * driven out of the connector.
> @@ -1939,7 +1949,8 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
> struct drm_connector *connector,
> const struct drm_connector_funcs *funcs,
> int connector_type,
> - struct i2c_adapter *ddc);
> + struct i2c_adapter *ddc,
> + unsigned int max_bpc);
> void drm_connector_attach_edid_property(struct drm_connector *connector);
> int drm_connector_register(struct drm_connector *connector);
> void drm_connector_unregister(struct drm_connector *connector);
>
Thanks,
pq
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