linux-kernel - Re: [PATCH 4/7] media: hantro: move postproc enablement for old cores

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Message-ID: <df868233-552f-ecc3-29e1-4a3a4761cf31@collabora.com>
Date:   Tue, 23 Nov 2021 13:12:04 +0100
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-media@...r.kernel.org
Cc:     ezequiel@...guardiasur.com.ar, nicolas.dufresne@...labora.com,
        mchehab@...nel.org, robh+dt@...nel.org, mripard@...nel.org,
        wens@...e.org, p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev
Subject: Re: [PATCH 4/7] media: hantro: move postproc enablement for old cores

Hi Jernej,

W dniu 22.11.2021 o 19:46, Jernej Skrabec pisze:
> Older G2 cores, like that in Allwinner H6, seem to have issue with
> latching postproc register values if this is first thing done in job.
> Moving that to the end solves the issue.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> ---
>   drivers/staging/media/hantro/hantro_drv.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> index 8c3de31f51b3..530994ab3024 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -130,7 +130,7 @@ void hantro_start_prepare_run(struct hantro_ctx *ctx)
>   	v4l2_ctrl_request_setup(src_buf->vb2_buf.req_obj.req,
>   				&ctx->ctrl_handler);
>   
> -	if (!ctx->is_encoder) {
> +	if (!ctx->is_encoder && !ctx->dev->variant->legacy_regs) {
>   		if (hantro_needs_postproc(ctx, ctx->vpu_dst_fmt))
>   			hantro_postproc_enable(ctx);
>   		else
> @@ -142,6 +142,13 @@ void hantro_end_prepare_run(struct hantro_ctx *ctx)
>   {
>   	struct vb2_v4l2_buffer *src_buf;
>   
> +	if (ctx->dev->variant->legacy_regs && !ctx->is_encoder) {

My personal preference would be to alter the order to match what is
in hantro_start_prepare_run(), and add a comment:

+       /*
+        * Older G2 cores, like that in Allwinner H6, seem to have issue with
+	 * latching postproc register values if this is first thing done in job.
+	 * Moving that to the end solves the issue.
+	 */
+	if (!ctx->is_encoder && ctx->dev->variant->legacy_regs) {

With that changed,

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>

> +		if (hantro_needs_postproc(ctx, ctx->vpu_dst_fmt))
> +			hantro_postproc_enable(ctx);
> +		else
> +			hantro_postproc_disable(ctx);
> +	}
> +
>   	src_buf = hantro_get_src_buf(ctx);
>   	v4l2_ctrl_request_complete(src_buf->vb2_buf.req_obj.req,
>   				   &ctx->ctrl_handler);
>