linux-kernel - Re: [PATCH v5 03/12] drm/bridge/synopsys: dw-hdmi: Enable workaround for v1.32a

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Message-ID: <859c9f7b-8be9-d53b-e8d5-aa04e6b5ca7b@codeaurora.org>
Date:   Fri, 16 Feb 2018 10:31:03 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Jernej Skrabec <jernej.skrabec@...l.net>,
        maxime.ripard@...e-electrons.com, wens@...e.org, airlied@...ux.ie,
        robh+dt@...nel.org, mark.rutland@....com, mturquette@...libre.com,
        sboyd@...nel.org, a.hajda@...sung.com,
        Laurent.pinchart@...asonboard.com, narmstrong@...libre.com,
        Jose.Abreu@...opsys.com
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v5 03/12] drm/bridge/synopsys: dw-hdmi: Enable workaround
 for v1.32a



On Thursday 15 February 2018 01:38 AM, Jernej Skrabec wrote:
> Allwinner SoCs have dw hdmi controller v1.32a which exhibits same
> magenta line issue as i.MX6Q and i.MX6DL. Enable workaround for it.
> 
> Tests show that one iteration is enough.
> 
> Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Reviewed-by: Archit Taneja <architt@...eaurora.org>

> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index a38db40ce990..7ca14d7325b5 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1634,9 +1634,10 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
>   	 * then write one of the FC registers several times.
>   	 *
>   	 * The number of iterations matters and depends on the HDMI TX revision
> -	 * (and possibly on the platform). So far only i.MX6Q (v1.30a) and
> -	 * i.MX6DL (v1.31a) have been identified as needing the workaround, with
> -	 * 4 and 1 iterations respectively.
> +	 * (and possibly on the platform). So far i.MX6Q (v1.30a), i.MX6DL
> +	 * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified
> +	 * as needing the workaround, with 4 iterations for v1.30a and 1
> +	 * iteration for others.
>   	 */
>   
>   	switch (hdmi->version) {
> @@ -1644,6 +1645,7 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
>   		count = 4;
>   		break;
>   	case 0x131a:
> +	case 0x132a:
>   		count = 1;
>   		break;
>   	default:
>