[v2,10/15] drm/vc4: hdmi: Support BCM2711 CEC interrupt setup

The HDMI controller found in the BCM2711 has an external interrupt
controller for the CEC and hotplug interrupt shared between the two
instances.

Let's add a variant flag to register a single interrupt handler and
deals with the interrupt handler setup, or two interrupt handlers
relying on an external irqchip.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 42 ++++++++++++++++++++++++++--------
 drivers/gpu/drm/vc4/vc4_hdmi.h |  7 ++++++
 2 files changed, 39 insertions(+), 10 deletions(-)

Hi Maxime

On Mon, 11 Jan 2021 at 14:23, Maxime Ripard <maxime@cerno.tech> wrote:
>
> The HDMI controller found in the BCM2711 has an external interrupt
> controller for the CEC and hotplug interrupt shared between the two
> instances.
>
> Let's add a variant flag to register a single interrupt handler and
> deals with the interrupt handler setup, or two interrupt handlers
> relying on an external irqchip.
>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Looks good

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

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 42 ++++++++++++++++++++++++++--------
>  drivers/gpu/drm/vc4/vc4_hdmi.h |  7 ++++++
>  2 files changed, 39 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 12ca5f3084af..d116ecfd8cf7 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -1605,9 +1605,11 @@ static int vc4_hdmi_cec_adap_enable(struct cec_adapter *adap, bool enable)
>                            ((3600 / usecs) << VC4_HDMI_CEC_CNT_TO_3600_US_SHIFT) |
>                            ((3500 / usecs) << VC4_HDMI_CEC_CNT_TO_3500_US_SHIFT));
>
> -               HDMI_WRITE(HDMI_CEC_CPU_MASK_CLEAR, VC4_HDMI_CPU_CEC);
> +               if (!vc4_hdmi->variant->external_irq_controller)
> +                       HDMI_WRITE(HDMI_CEC_CPU_MASK_CLEAR, VC4_HDMI_CPU_CEC);
>         } else {
> -               HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, VC4_HDMI_CPU_CEC);
> +               if (!vc4_hdmi->variant->external_irq_controller)
> +                       HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, VC4_HDMI_CPU_CEC);
>                 HDMI_WRITE(HDMI_CEC_CNTRL_5, val |
>                            VC4_HDMI_CEC_TX_SW_RESET | VC4_HDMI_CEC_RX_SW_RESET);
>         }
> @@ -1682,8 +1684,6 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi)
>         cec_fill_conn_info_from_drm(&conn_info, &vc4_hdmi->connector);
>         cec_s_conn_info(vc4_hdmi->cec_adap, &conn_info);
>
> -       HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, 0xffffffff);
> -
>         value = HDMI_READ(HDMI_CEC_CNTRL_1);
>         /* Set the logical address to Unregistered */
>         value |= VC4_HDMI_CEC_ADDR_MASK;
> @@ -1691,12 +1691,32 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi)
>
>         vc4_hdmi_cec_update_clk_div(vc4_hdmi);
>
> -       ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0),
> -                                       vc4_cec_irq_handler,
> -                                       vc4_cec_irq_handler_thread, 0,
> -                                       "vc4 hdmi cec", vc4_hdmi);
> -       if (ret)
> -               goto err_delete_cec_adap;
> +       if (vc4_hdmi->variant->external_irq_controller) {
> +               ret = devm_request_threaded_irq(&pdev->dev,
> +                                               platform_get_irq_byname(pdev, "cec-rx"),
> +                                               vc4_cec_irq_handler_rx_bare,
> +                                               vc4_cec_irq_handler_rx_thread, 0,
> +                                               "vc4 hdmi cec rx", vc4_hdmi);
> +               if (ret)
> +                       goto err_delete_cec_adap;
> +
> +               ret = devm_request_threaded_irq(&pdev->dev,
> +                                               platform_get_irq_byname(pdev, "cec-tx"),
> +                                               vc4_cec_irq_handler_tx_bare,
> +                                               vc4_cec_irq_handler_tx_thread, 0,
> +                                               "vc4 hdmi cec tx", vc4_hdmi);
> +               if (ret)
> +                       goto err_delete_cec_adap;
> +       } else {
> +               HDMI_WRITE(HDMI_CEC_CPU_MASK_SET, 0xffffffff);
> +
> +               ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0),
> +                                               vc4_cec_irq_handler,
> +                                               vc4_cec_irq_handler_thread, 0,
> +                                               "vc4 hdmi cec", vc4_hdmi);
> +               if (ret)
> +                       goto err_delete_cec_adap;
> +       }
>
>         ret = cec_register_adapter(vc4_hdmi->cec_adap, &pdev->dev);
>         if (ret < 0)
> @@ -2095,6 +2115,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi0_variant = {
>                 PHY_LANE_CK,
>         },
>         .unsupported_odd_h_timings      = true,
> +       .external_irq_controller        = true,
>
>         .init_resources         = vc5_hdmi_init_resources,
>         .csc_setup              = vc5_hdmi_csc_setup,
> @@ -2121,6 +2142,7 @@ static const struct vc4_hdmi_variant bcm2711_hdmi1_variant = {
>                 PHY_LANE_2,
>         },
>         .unsupported_odd_h_timings      = true,
> +       .external_irq_controller        = true,
>
>         .init_resources         = vc5_hdmi_init_resources,
>         .csc_setup              = vc5_hdmi_csc_setup,
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index 6966db1a0957..d71f6ed321bf 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -64,6 +64,13 @@ struct vc4_hdmi_variant {
>         /* The BCM2711 cannot deal with odd horizontal pixel timings */
>         bool unsupported_odd_h_timings;
>
> +       /*
> +        * The BCM2711 CEC/hotplug IRQ controller is shared between the
> +        * two HDMI controllers, and we have a proper irqchip driver for
> +        * it.
> +        */
> +       bool external_irq_controller;
> +
>         /* Callback to get the resources (memory region, interrupts,
>          * clocks, etc) for that variant.
>          */
> --
> 2.29.2
>