linux-kernel - Re: [PATCH v3 3/5] drm: xlnx: zynqmp

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Message-ID: <a5de522e-240c-44f7-a968-74a10a4cb62f@ideasonboard.com>
Date: Thu, 1 Feb 2024 09:39:39 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Anatoliy Klymenko <anatoliy.klymenko@....com>
Cc: laurent.pinchart@...asonboard.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
 michal.simek@....com, dri-devel@...ts.freedesktop.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/5] drm: xlnx: zynqmp_dpsub: Clear status register
 ASAP

On 24/01/2024 04:54, Anatoliy Klymenko wrote:
> Clear status register as soon as we read it.
> 
> Addressing comments from
> https://lore.kernel.org/dri-devel/beb551c7-bb7e-4cd0-b166-e9aad90c4620@ideasonboard.com/
> 
> Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@....com>
> ---
>   drivers/gpu/drm/xlnx/zynqmp_dp.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> index d60b7431603f..5a3335e1fffa 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> @@ -1624,6 +1624,8 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
>   	u32 status, mask;
>   
>   	status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
> +	/* clear status register as soon as we read it */
> +	zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
>   	mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
>   	if (!(status & ~mask))
>   		return IRQ_NONE;
> @@ -1634,8 +1636,6 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
>   	if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
>   		dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
>   
> -	zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
> -
>   	if (status & ZYNQMP_DP_INT_VBLANK_START)
>   		zynqmp_dpsub_drm_handle_vblank(dp->dpsub);
>   

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

  Tomi