linux-kernel - Re: [PATCH v4 57/78] drm/vc4: hdmi: Deal with multiple debugfs files

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Message-ID: <CAPY8ntAmDtbofNQ-V-UjWjGupN=MG03tOzVG9F1=hG5T4HTsJg@mail.gmail.com>
Date:   Tue, 28 Jul 2020 14:20:50 +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 57/78] drm/vc4: hdmi: Deal with multiple debugfs files

Hi Maxime

On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@...no.tech> wrote:
>
> The HDMI driver was registering a single debugfs file so far with the name
> hdmi_regs.
>
> Obviously, this is not going to work anymore when will have multiple HDMI
> controllers since we will end up trying to register two files with the same
> name.
>
> Let's use the variant to avoid that name conflict.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

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

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 5 ++++-
>  drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +++
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index c50241170d7e..ef51eedaf75a 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -1370,7 +1370,9 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
>         if (ret)
>                 goto err_destroy_encoder;
>
> -       vc4_debugfs_add_file(drm, "hdmi_regs", vc4_hdmi_debugfs_regs, vc4_hdmi);
> +       vc4_debugfs_add_file(drm, variant->debugfs_name,
> +                            vc4_hdmi_debugfs_regs,
> +                            vc4_hdmi);
>
>         return 0;
>
> @@ -1448,6 +1450,7 @@ static int vc4_hdmi_dev_remove(struct platform_device *pdev)
>
>  static const struct vc4_hdmi_variant bcm2835_variant = {
>         .encoder_type           = VC4_ENCODER_TYPE_HDMI0,
> +       .debugfs_name           = "hdmi_regs",
>         .registers              = vc4_hdmi_fields,
>         .num_registers          = ARRAY_SIZE(vc4_hdmi_fields),
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index 0d529db4b3ab..794216f3228d 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -30,6 +30,9 @@ struct vc4_hdmi_variant {
>         /* Encoder Type for that controller */
>         enum vc4_encoder_type encoder_type;
>
> +       /* Filename to expose the registers in debugfs */
> +       const char *debugfs_name;
> +
>         /* List of the registers available on that variant */
>         const struct vc4_hdmi_register *registers;
>
> --
> git-series 0.9.1