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Message-ID: <CAPY8ntB3eeqqz0hPSfHiJpKs9sJpU5uN5GzLsqmhtxrD0i6TJg@mail.gmail.com>
Date: Tue, 28 Jul 2020 16:30:16 +0100
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Maxime Ripard <maxime@...no.tech>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
Eric Anholt <eric@...olt.net>,
DRI Development <dri-devel@...ts.freedesktop.org>,
linux-rpi-kernel@...ts.infradead.org,
bcm-kernel-feedback-list@...adcom.com,
linux-arm-kernel@...ts.infradead.org,
LKML <linux-kernel@...r.kernel.org>,
Tim Gover <tim.gover@...pberrypi.com>,
Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v4 77/78] drm/vc4: drv: Support BCM2711
Hi Maxime
On Wed, 8 Jul 2020 at 18:44, Maxime Ripard <maxime@...no.tech> wrote:
>
> The BCM2711 has a reworked display pipeline, and the load tracker needs
> some adjustement to operate properly. Let's add a compatible for BCM2711
s/adjustement/adjustment
> and disable the load tracker until properly supported.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
> drivers/gpu/drm/vc4/vc4_drv.c | 1 +-
> drivers/gpu/drm/vc4/vc4_drv.h | 3 ++-
> drivers/gpu/drm/vc4/vc4_kms.c | 42 +++++++++++++++++++++++-----------
> drivers/gpu/drm/vc4/vc4_plane.c | 5 ++++-
> 4 files changed, 38 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
> index 9567d1019212..f1a5fd5dab6f 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.c
> +++ b/drivers/gpu/drm/vc4/vc4_drv.c
> @@ -372,6 +372,7 @@ static int vc4_platform_drm_remove(struct platform_device *pdev)
> }
>
> static const struct of_device_id vc4_of_match[] = {
> + { .compatible = "brcm,bcm2711-vc5", },
> { .compatible = "brcm,bcm2835-vc4", },
> { .compatible = "brcm,cygnus-vc4", },
> {},
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 501a48a714d3..8c8d96b6289f 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -200,6 +200,9 @@ struct vc4_dev {
>
> int power_refcount;
>
> + /* Set to true when the load tracker is supported. */
> + bool load_tracker_available;
> +
> /* Set to true when the load tracker is active. */
> bool load_tracker_enabled;
>
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> index 7c8a87339959..ae479f988666 100644
> --- a/drivers/gpu/drm/vc4/vc4_kms.c
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -532,6 +532,9 @@ static int vc4_load_tracker_atomic_check(struct drm_atomic_state *state)
> struct drm_plane *plane;
> int i;
>
> + if (!vc4->load_tracker_available)
> + return 0;
> +
> priv_state = drm_atomic_get_private_obj_state(state,
> &vc4->load_tracker);
> if (IS_ERR(priv_state))
> @@ -681,10 +684,14 @@ int vc4_kms_load(struct drm_device *dev)
> struct vc4_load_tracker_state *load_state;
> int ret;
>
> - /* Start with the load tracker enabled. Can be disabled through the
> - * debugfs load_tracker file.
> - */
> - vc4->load_tracker_enabled = true;
> + if (!of_device_is_compatible(dev->dev->of_node, "brcm,bcm2711-vc5")) {
Is it better to look up the compatible string, or pass something via
the .data element of the of_device_id table? Probably down to personal
preference?
> + vc4->load_tracker_available = true;
> +
> + /* Start with the load tracker enabled. Can be
> + * disabled through the debugfs load_tracker file.
> + */
> + vc4->load_tracker_enabled = true;
> + }
>
> sema_init(&vc4->async_modeset, 1);
>
> @@ -698,8 +705,14 @@ int vc4_kms_load(struct drm_device *dev)
> return ret;
> }
>
> - dev->mode_config.max_width = 2048;
> - dev->mode_config.max_height = 2048;
> + if (of_device_is_compatible(dev->dev->of_node, "brcm,bcm2711-vc5")) {
We're making the same of_device_is_compatible call twice within
vc4_kms_load. Set a flag based on it and check that instead?
Dave
> + dev->mode_config.max_width = 7680;
> + dev->mode_config.max_height = 7680;
> + } else {
> + dev->mode_config.max_width = 2048;
> + dev->mode_config.max_height = 2048;
> + }
> +
> dev->mode_config.funcs = &vc4_mode_funcs;
> dev->mode_config.preferred_depth = 24;
> dev->mode_config.async_page_flip = true;
> @@ -714,14 +727,17 @@ int vc4_kms_load(struct drm_device *dev)
> drm_atomic_private_obj_init(dev, &vc4->ctm_manager, &ctm_state->base,
> &vc4_ctm_state_funcs);
>
> - load_state = kzalloc(sizeof(*load_state), GFP_KERNEL);
> - if (!load_state) {
> - drm_atomic_private_obj_fini(&vc4->ctm_manager);
> - return -ENOMEM;
> - }
> + if (vc4->load_tracker_available) {
> + load_state = kzalloc(sizeof(*load_state), GFP_KERNEL);
> + if (!load_state) {
> + drm_atomic_private_obj_fini(&vc4->ctm_manager);
> + return -ENOMEM;
> + }
>
> - drm_atomic_private_obj_init(dev, &vc4->load_tracker, &load_state->base,
> - &vc4_load_tracker_state_funcs);
> + drm_atomic_private_obj_init(dev, &vc4->load_tracker,
> + &load_state->base,
> + &vc4_load_tracker_state_funcs);
> + }
>
> drm_mode_config_reset(dev);
>
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 1e38e603f83b..24d7e6db6fdd 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -516,6 +516,11 @@ static void vc4_plane_calc_load(struct drm_plane_state *state)
> struct vc4_plane_state *vc4_state;
> struct drm_crtc_state *crtc_state;
> unsigned int vscale_factor;
> + struct vc4_dev *vc4;
> +
> + vc4 = to_vc4_dev(state->plane->dev);
> + if (!vc4->load_tracker_available)
> + return;
>
> vc4_state = to_vc4_plane_state(state);
> crtc_state = drm_atomic_get_existing_crtc_state(state->state,
> --
> git-series 0.9.1
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