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

Dave Stevenson
2021-01-22T13:02:39Z

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
>