Re: [PATCH v2 09/15] drm/vc4: hdmi: Split the interrupt handlers

[Dave Stevenson <dave.stevenson@raspberrypi.com>]

Hi Maxime

On Mon, 11 Jan 2021 at 14:23, Maxime Ripard <maxime@cerno.tech> wrote:
>
> The BCM2711 has two different interrupt sources to transmit and receive
> CEC messages, provided through an external interrupt chip shared between
> the two HDMI interrupt controllers.
>
> The rest of the CEC controller is identical though so we need to change
> a bit the code organisation to share the code as much as possible, yet
> still allowing to register independant handlers.

s/independant/independent

>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>

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

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 86 +++++++++++++++++++++++++---------
>  1 file changed, 65 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 7b5c92df8f1b..12ca5f3084af 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -1454,15 +1454,22 @@ static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
>  }
>
>  #ifdef CONFIG_DRM_VC4_HDMI_CEC
> -static irqreturn_t vc4_cec_irq_handler_thread(int irq, void *priv)
> +static irqreturn_t vc4_cec_irq_handler_rx_thread(int irq, void *priv)
>  {
>         struct vc4_hdmi *vc4_hdmi = priv;
>
> -       if (vc4_hdmi->cec_irq_was_rx) {
> -               if (vc4_hdmi->cec_rx_msg.len)
> -                       cec_received_msg(vc4_hdmi->cec_adap,
> -                                        &vc4_hdmi->cec_rx_msg);
> -       } else if (vc4_hdmi->cec_tx_ok) {
> +       if (vc4_hdmi->cec_rx_msg.len)
> +               cec_received_msg(vc4_hdmi->cec_adap,
> +                                &vc4_hdmi->cec_rx_msg);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t vc4_cec_irq_handler_tx_thread(int irq, void *priv)
> +{
> +       struct vc4_hdmi *vc4_hdmi = priv;
> +
> +       if (vc4_hdmi->cec_tx_ok) {
>                 cec_transmit_done(vc4_hdmi->cec_adap, CEC_TX_STATUS_OK,
>                                   0, 0, 0, 0);
>         } else {
> @@ -1476,6 +1483,19 @@ static irqreturn_t vc4_cec_irq_handler_thread(int irq, void *priv)
>         return IRQ_HANDLED;
>  }
>
> +static irqreturn_t vc4_cec_irq_handler_thread(int irq, void *priv)
> +{
> +       struct vc4_hdmi *vc4_hdmi = priv;
> +       irqreturn_t ret;
> +
> +       if (vc4_hdmi->cec_irq_was_rx)
> +               ret = vc4_cec_irq_handler_rx_thread(irq, priv);
> +       else
> +               ret = vc4_cec_irq_handler_tx_thread(irq, priv);
> +
> +       return ret;
> +}
> +
>  static void vc4_cec_read_msg(struct vc4_hdmi *vc4_hdmi, u32 cntrl1)
>  {
>         struct drm_device *dev = vc4_hdmi->connector.dev;
> @@ -1500,31 +1520,55 @@ static void vc4_cec_read_msg(struct vc4_hdmi *vc4_hdmi, u32 cntrl1)
>         }
>  }
>
> +static irqreturn_t vc4_cec_irq_handler_tx_bare(int irq, void *priv)
> +{
> +       struct vc4_hdmi *vc4_hdmi = priv;
> +       u32 cntrl1;
> +
> +       cntrl1 = HDMI_READ(HDMI_CEC_CNTRL_1);
> +       vc4_hdmi->cec_tx_ok = cntrl1 & VC4_HDMI_CEC_TX_STATUS_GOOD;
> +       cntrl1 &= ~VC4_HDMI_CEC_START_XMIT_BEGIN;
> +       HDMI_WRITE(HDMI_CEC_CNTRL_1, cntrl1);
> +
> +       return IRQ_WAKE_THREAD;
> +}
> +
> +static irqreturn_t vc4_cec_irq_handler_rx_bare(int irq, void *priv)
> +{
> +       struct vc4_hdmi *vc4_hdmi = priv;
> +       u32 cntrl1;
> +
> +       vc4_hdmi->cec_rx_msg.len = 0;
> +       cntrl1 = HDMI_READ(HDMI_CEC_CNTRL_1);
> +       vc4_cec_read_msg(vc4_hdmi, cntrl1);
> +       cntrl1 |= VC4_HDMI_CEC_CLEAR_RECEIVE_OFF;
> +       HDMI_WRITE(HDMI_CEC_CNTRL_1, cntrl1);
> +       cntrl1 &= ~VC4_HDMI_CEC_CLEAR_RECEIVE_OFF;
> +
> +       HDMI_WRITE(HDMI_CEC_CNTRL_1, cntrl1);
> +
> +       return IRQ_WAKE_THREAD;
> +}
> +
>  static irqreturn_t vc4_cec_irq_handler(int irq, void *priv)
>  {
>         struct vc4_hdmi *vc4_hdmi = priv;
>         u32 stat = HDMI_READ(HDMI_CEC_CPU_STATUS);
> -       u32 cntrl1, cntrl5;
> +       irqreturn_t ret;
> +       u32 cntrl5;
>
>         if (!(stat & VC4_HDMI_CPU_CEC))
>                 return IRQ_NONE;
> -       vc4_hdmi->cec_rx_msg.len = 0;
> -       cntrl1 = HDMI_READ(HDMI_CEC_CNTRL_1);
> +
>         cntrl5 = HDMI_READ(HDMI_CEC_CNTRL_5);
>         vc4_hdmi->cec_irq_was_rx = cntrl5 & VC4_HDMI_CEC_RX_CEC_INT;
> -       if (vc4_hdmi->cec_irq_was_rx) {
> -               vc4_cec_read_msg(vc4_hdmi, cntrl1);
> -               cntrl1 |= VC4_HDMI_CEC_CLEAR_RECEIVE_OFF;
> -               HDMI_WRITE(HDMI_CEC_CNTRL_1, cntrl1);
> -               cntrl1 &= ~VC4_HDMI_CEC_CLEAR_RECEIVE_OFF;
> -       } else {
> -               vc4_hdmi->cec_tx_ok = cntrl1 & VC4_HDMI_CEC_TX_STATUS_GOOD;
> -               cntrl1 &= ~VC4_HDMI_CEC_START_XMIT_BEGIN;
> -       }
> -       HDMI_WRITE(HDMI_CEC_CNTRL_1, cntrl1);
> +       if (vc4_hdmi->cec_irq_was_rx)
> +               ret = vc4_cec_irq_handler_rx_bare(irq, priv);
> +       else
> +               ret = vc4_cec_irq_handler_tx_bare(irq, priv);
> +
>         HDMI_WRITE(HDMI_CEC_CPU_CLEAR, VC4_HDMI_CPU_CEC);
> -
> -       return IRQ_WAKE_THREAD;
> +       return ret;
>  }
>
>  static int vc4_hdmi_cec_adap_enable(struct cec_adapter *adap, bool enable)
> --
> 2.29.2
>