linux-kernel - Re: [PATCH v2 3/9] drm/msm/mdp4: add lcdc-align-lsb flag to control lane alignment

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Message-ID: <CAF6AEGujMhgArNPq9SXwGhu3KT_fW770qBKyXBD2=oA6pghJyA@mail.gmail.com>
Date:   Sun, 2 Dec 2018 10:49:44 -0500
From:   Rob Clark <robdclark@...il.com>
To:     Jonathan <jonathan@...ek.ca>
Cc:     freedreno <freedreno@...ts.freedesktop.org>,
        Chris Healy <Chris.Healy@....aero>,
        Fabio Estevam <festevam@...il.com>,
        David Airlie <airlied@...ux.ie>, boris.brezillon@...tlin.com,
        Thierry Reding <treding@...dia.com>,
        Sean Paul <seanpaul@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/9] drm/msm/mdp4: add lcdc-align-lsb flag to control
 lane alignment

On Wed, Nov 21, 2018 at 8:55 PM Jonathan Marek <jonathan@...ek.ca> wrote:
>
> Controls which of the 8 lanes are used for 6 bit color.
>
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>  .../gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c | 22 ++++++++++++-------
>  1 file changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
> index e19ab2ab63f7..7d8d11c8150a 100644
> --- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
> @@ -377,20 +377,26 @@ static void mdp4_lcdc_encoder_enable(struct drm_encoder *encoder)
>         unsigned long pc = mdp4_lcdc_encoder->pixclock;
>         struct mdp4_kms *mdp4_kms = get_kms(encoder);
>         struct drm_panel *panel;
> +       uint32_t config;
>         int i, ret;
>
>         if (WARN_ON(mdp4_lcdc_encoder->enabled))
>                 return;
>
>         /* TODO: hard-coded for 18bpp: */
> -       mdp4_crtc_set_config(encoder->crtc,
> -                       MDP4_DMA_CONFIG_R_BPC(BPC6) |
> -                       MDP4_DMA_CONFIG_G_BPC(BPC6) |
> -                       MDP4_DMA_CONFIG_B_BPC(BPC6) |
> -                       MDP4_DMA_CONFIG_PACK_ALIGN_MSB |
> -                       MDP4_DMA_CONFIG_PACK(0x21) |
> -                       MDP4_DMA_CONFIG_DEFLKR_EN |
> -                       MDP4_DMA_CONFIG_DITHER_EN);
> +       config =
> +               MDP4_DMA_CONFIG_R_BPC(BPC6) |
> +               MDP4_DMA_CONFIG_G_BPC(BPC6) |
> +               MDP4_DMA_CONFIG_B_BPC(BPC6) |
> +               MDP4_DMA_CONFIG_PACK(0x21) |
> +               MDP4_DMA_CONFIG_DEFLKR_EN |
> +               MDP4_DMA_CONFIG_DITHER_EN;
> +
> +       if (!of_find_property(dev->dev->of_node, "lcdc-align-lsb", NULL))
> +               config |= MDP4_DMA_CONFIG_PACK_ALIGN_MSB;
> +
> +

looks reasonable, except extra newline (minor nit) and more
importantly the new dt property needs to be documented (and cc'd to
devicetree list)

BR,
-R

> +       mdp4_crtc_set_config(encoder->crtc, config);
>         mdp4_crtc_set_intf(encoder->crtc, INTF_LCDC_DTV, 0);
>
>         bs_set(mdp4_lcdc_encoder, 1);
> --
> 2.17.1
>