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In-Reply-To: <ece0d45f529cce9fb64100ddee726b81f7aa247a.1594230107.git-series.maxime@cerno.tech>
From:   Dave Stevenson <dave.stevenson@raspberrypi.com>
Date:   Tue, 28 Jul 2020 13:37:20 +0100
Message-ID: <CAPY8ntDsKQBzqA3HUvn3qva4+zggLaLsmr=DL2FyRrRHAL=T_Q@mail.gmail.com>
Subject: Re: [PATCH v4 50/78] drm/vc4: hdmi: Introduce resource init and variant
To:     Maxime Ripard <maxime@cerno.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Eric Anholt <eric@anholt.net>,
        DRI Development <dri-devel@lists.freedesktop.org>,
        linux-rpi-kernel@lists.infradead.org,
        bcm-kernel-feedback-list@broadcom.com,
        linux-arm-kernel@lists.infradead.org,
        LKML <linux-kernel@vger.kernel.org>,
        Tim Gover <tim.gover@raspberrypi.com>,
        Phil Elwell <phil@raspberrypi.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Maxime

On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@cerno.tech> wrote:
>
> The HDMI controllers found in the BCM2711 has a pretty different clock and
> registers areas than found in the older BCM283x SoCs.
>
> Let's create a variant structure to store the various adjustments we'll
> need later on, and a function to get the resources needed for one
> particular version.
>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>

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

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 61 +++++++++++++++++++++++------------
>  drivers/gpu/drm/vc4/vc4_hdmi.h | 10 ++++++-
>  2 files changed, 51 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index ec7710dfd04e..ac021e07a8cb 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -1179,28 +1179,12 @@ static const struct cec_adap_ops vc4_hdmi_cec_adap_ops = {
>  };
>  #endif
>
> -static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
> +static int vc4_hdmi_init_resources(struct vc4_hdmi *vc4_hdmi)
>  {
> -#ifdef CONFIG_DRM_VC4_HDMI_CEC
> -       struct cec_connector_info conn_info;
> -#endif
> -       struct platform_device *pdev = to_platform_device(dev);
> -       struct drm_device *drm = dev_get_drvdata(master);
> -       struct vc4_hdmi *vc4_hdmi;
> -       struct drm_encoder *encoder;
> -       struct device_node *ddc_node;
> -       u32 value;
> +       struct platform_device *pdev = vc4_hdmi->pdev;
> +       struct device *dev = &pdev->dev;
>         int ret;
>
> -       vc4_hdmi = devm_kzalloc(dev, sizeof(*vc4_hdmi), GFP_KERNEL);
> -       if (!vc4_hdmi)
> -               return -ENOMEM;
> -
> -       dev_set_drvdata(dev, vc4_hdmi);
> -       encoder = &vc4_hdmi->encoder.base.base;
> -       vc4_hdmi->encoder.base.type = VC4_ENCODER_TYPE_HDMI0;
> -       vc4_hdmi->pdev = pdev;
> -
>         vc4_hdmi->hdmicore_regs = vc4_ioremap_regs(pdev, 0);
>         if (IS_ERR(vc4_hdmi->hdmicore_regs))
>                 return PTR_ERR(vc4_hdmi->hdmicore_regs);
> @@ -1212,6 +1196,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
>         vc4_hdmi->hdmi_regset.base = vc4_hdmi->hdmicore_regs;
>         vc4_hdmi->hdmi_regset.regs = hdmi_regs;
>         vc4_hdmi->hdmi_regset.nregs = ARRAY_SIZE(hdmi_regs);
> +
>         vc4_hdmi->hd_regset.base = vc4_hdmi->hd_regs;
>         vc4_hdmi->hd_regset.regs = hd_regs;
>         vc4_hdmi->hd_regset.nregs = ARRAY_SIZE(hd_regs);
> @@ -1223,12 +1208,44 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
>                         DRM_ERROR("Failed to get pixel clock\n");
>                 return ret;
>         }
> +
>         vc4_hdmi->hsm_clock = devm_clk_get(dev, "hdmi");
>         if (IS_ERR(vc4_hdmi->hsm_clock)) {
>                 DRM_ERROR("Failed to get HDMI state machine clock\n");
>                 return PTR_ERR(vc4_hdmi->hsm_clock);
>         }
>
> +       return 0;
> +}
> +
> +static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
> +{
> +#ifdef CONFIG_DRM_VC4_HDMI_CEC
> +       struct cec_connector_info conn_info;
> +#endif
> +       const struct vc4_hdmi_variant *variant = of_device_get_match_data(dev);
> +       struct platform_device *pdev = to_platform_device(dev);
> +       struct drm_device *drm = dev_get_drvdata(master);
> +       struct vc4_hdmi *vc4_hdmi;
> +       struct drm_encoder *encoder;
> +       struct device_node *ddc_node;
> +       u32 value;
> +       int ret;
> +
> +       vc4_hdmi = devm_kzalloc(dev, sizeof(*vc4_hdmi), GFP_KERNEL);
> +       if (!vc4_hdmi)
> +               return -ENOMEM;
> +
> +       dev_set_drvdata(dev, vc4_hdmi);
> +       encoder = &vc4_hdmi->encoder.base.base;
> +       vc4_hdmi->encoder.base.type = VC4_ENCODER_TYPE_HDMI0;
> +       vc4_hdmi->pdev = pdev;
> +       vc4_hdmi->variant = variant;
> +
> +       ret = variant->init_resources(vc4_hdmi);
> +       if (ret)
> +               return ret;
> +
>         ddc_node = of_parse_phandle(dev->of_node, "ddc", 0);
>         if (!ddc_node) {
>                 DRM_ERROR("Failed to find ddc node in device tree\n");
> @@ -1404,8 +1421,12 @@ static int vc4_hdmi_dev_remove(struct platform_device *pdev)
>         return 0;
>  }
>
> +static const struct vc4_hdmi_variant bcm2835_variant = {
> +       .init_resources         = vc4_hdmi_init_resources,
> +};
> +
>  static const struct of_device_id vc4_hdmi_dt_match[] = {
> -       { .compatible = "brcm,bcm2835-hdmi" },
> +       { .compatible = "brcm,bcm2835-hdmi", .data = &bcm2835_variant },
>         {}
>  };
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index 674541493909..0eaf979fe811 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -21,6 +21,15 @@ to_vc4_hdmi_encoder(struct drm_encoder *encoder)
>         return container_of(encoder, struct vc4_hdmi_encoder, base.base);
>  }
>
> +struct vc4_hdmi;
> +
> +struct vc4_hdmi_variant {
> +       /* Callback to get the resources (memory region, interrupts,
> +        * clocks, etc) for that variant.
> +        */
> +       int (*init_resources)(struct vc4_hdmi *vc4_hdmi);
> +};
> +
>  /* HDMI audio information */
>  struct vc4_hdmi_audio {
>         struct snd_soc_card card;
> @@ -39,6 +48,7 @@ struct vc4_hdmi {
>         struct vc4_hdmi_audio audio;
>
>         struct platform_device *pdev;
> +       const struct vc4_hdmi_variant *variant;
>
>         struct vc4_hdmi_encoder encoder;
>         struct drm_connector connector;
> --
> git-series 0.9.1