linux-kernel - Re: [PATCH 07/10] drm: bridge: it66121: Don't clear DDC FIFO twice

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Date:   Thu, 15 Dec 2022 12:20:27 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Phong LE <ple@...libre.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        list@...ndingux.net, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/10] drm: bridge: it66121: Don't clear DDC FIFO twice

On Wed, 14 Dec 2022 at 13:59, Paul Cercueil <paul@...pouillou.net> wrote:
>
> The DDC FIFO was cleared before the loop in it66121_get_edid_block(),
> and at the beginning of each iteration; which means that it did not have
> to be cleared before the loop.
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/gpu/drm/bridge/ite-it66121.c | 16 ----------------
>  1 file changed, 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
> index 06fa59ae5ffc..5335d4abd7c5 100644
> --- a/drivers/gpu/drm/bridge/ite-it66121.c
> +++ b/drivers/gpu/drm/bridge/ite-it66121.c
> @@ -456,18 +456,6 @@ static inline int it66121_wait_ddc_ready(struct it66121_ctx *ctx)
>         return 0;
>  }
>
> -static int it66121_clear_ddc_fifo(struct it66121_ctx *ctx)
> -{
> -       int ret;
> -
> -       ret = it66121_preamble_ddc(ctx);
> -       if (ret)
> -               return ret;
> -
> -       return regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
> -                           IT66121_DDC_COMMAND_FIFO_CLR);
> -}
> -
>  static int it66121_abort_ddc_ops(struct it66121_ctx *ctx)
>  {
>         int ret;
> @@ -515,10 +503,6 @@ static int it66121_get_edid_block(void *context, u8 *buf,
>         offset = (block % 2) * len;
>         block = block / 2;
>
> -       ret = it66121_clear_ddc_fifo(ctx);
> -       if (ret)
> -               return ret;
> -
>         while (remain > 0) {
>                 cnt = (remain > IT66121_EDID_FIFO_SIZE) ?
>                                 IT66121_EDID_FIFO_SIZE : remain;
> --
> 2.35.1
>

Reviewed-by: Robert Foss <robert.foss@...aro.org>