linux-kernel - Re: [PATCH v8 06/10] drm/vc4: crtc: Add some logging

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Date:   Tue, 2 Nov 2021 16:33:14 +0000
From:   Dave Stevenson <dave.stevenson@...pberrypi.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        linux-rpi-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Emma Anholt <emma@...olt.net>,
        Phil Elwell <phil@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH v8 06/10] drm/vc4: crtc: Add some logging

On Mon, 25 Oct 2021 at 16:29, Maxime Ripard <maxime@...no.tech> wrote:
>
> The encoder retrieval code has been a source of bugs and glitches in the
> past and the crtc <-> encoder association been wrong in a number of
> different ways.
>
> Add some logging to quickly spot issues if they occur.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>

> ---
>  drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index fbc1d4638650..6decaa12a078 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -541,6 +541,9 @@ static void vc4_crtc_atomic_disable(struct drm_crtc *crtc,
>         struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc, old_state);
>         struct drm_device *dev = crtc->dev;
>
> +       drm_dbg(dev, "Disabling CRTC %s (%u) connected to Encoder %s (%u)",
> +               crtc->name, crtc->base.id, encoder->name, encoder->base.id);
> +
>         require_hvs_enabled(dev);
>
>         /* Disable vblank irq handling before crtc is disabled. */
> @@ -572,6 +575,9 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
>         struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc, new_state);
>         struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
>
> +       drm_dbg(dev, "Enabling CRTC %s (%u) connected to Encoder %s (%u)",
> +               crtc->name, crtc->base.id, encoder->name, encoder->base.id);
> +
>         require_hvs_enabled(dev);
>
>         /* Enable vblank irq handling before crtc is started otherwise
> --
> 2.31.1
>