[PATCH v4 06/11] drm/bridge: it6505: fix HDCP Bstatus check.

[AngeloGioacchino Del Regno]

Il 26/09/24 09:50, Hermes Wu ha scritto:
> From: Hermes Wu <Hermes.wu at ite.com.tw>
> 
> When HDCP is activated, A DisplayPort source receives CP_IRQ from the
> sink shall check Bstatus from DPCD and process the corresponding value.
> 
> 
> Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
> Signed-off-by: Hermes Wu <Hermes.wu at ite.com.tw>
> ---
>   drivers/gpu/drm/bridge/ite-it6505.c | 12 +++++++++---
>   1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index 5d5ce12cd054..d2ec3dfc57d6 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -2322,14 +2322,20 @@ static int it6505_process_hpd_irq(struct it6505 *it6505)
>   	DRM_DEV_DEBUG_DRIVER(dev, "dp_irq_vector = 0x%02x", dp_irq_vector);
>   
>   	if (dp_irq_vector & DP_CP_IRQ) {
> -		it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,
> -				HDCP_TRIGGER_CPIRQ);
> -
>   		bstatus = it6505_dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
>   		if (bstatus < 0)
>   			return bstatus;
>   
>   		DRM_DEV_DEBUG_DRIVER(dev, "Bstatus = 0x%02x", bstatus);
> +
> +		/*check BSTATUS when recive CP_IRQ */

/* Check .... */

> +		if (bstatus & DP_BSTATUS_R0_PRIME_READY &&
> +		    it6505->hdcp_status == HDCP_AUTH_GOING)
> +			it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,
> +					HDCP_TRIGGER_CPIRQ);
> +		else if (bstatus & (DP_BSTATUS_REAUTH_REQ | DP_BSTATUS_LINK_FAILURE) &&
> +			 it6505->hdcp_status == HDCP_AUTH_DONE)
> +			it6505_start_hdcp(it6505);
>   	}
>   
>   	ret = drm_dp_dpcd_read_link_status(&it6505->aux, link_status);