linux-kernel - Re: [PATCH 11/12] gpu/drm: Ingenic: Add support for the IPU

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Date:   Mon, 18 May 2020 11:48:59 +0100
From:   Emil Velikov <emil.l.velikov@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        devicetree <devicetree@...r.kernel.org>, od@...c.me,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 11/12] gpu/drm: Ingenic: Add support for the IPU

Hi Paul,

Disclaimer: I don't know much about the hardware :-P

On Sun, 17 May 2020 at 00:31, Paul Cercueil <paul@...pouillou.net> wrote:
>
> Add support for the Image Processing Unit (IPU) found in all Ingenic
> SoCs.
>
Since the IPU is present on all devices supported, does it make sense
to have it as separate module?
Didn't check closely although I suspect doing that will remove the
need for the component patch.

> --- a/drivers/gpu/drm/ingenic/ingenic-drm.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> @@ -50,7 +50,7 @@ struct jz_soc_info {
>
>  struct ingenic_drm {
>         struct drm_device drm;
> -       struct drm_plane f0, f1;
> +       struct drm_plane f0, f1, *ipu_plane;
>         struct drm_crtc crtc;
>         struct drm_encoder encoder;
>
> @@ -186,13 +186,16 @@ static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
>         regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>                            JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16,
>                            JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16);
> +
> +       regmap_write(priv->map, JZ_REG_LCD_IPUR, JZ_LCD_IPUR_IPUREN |
> +                    (ht * vpe / 3) << JZ_LCD_IPUR_IPUR_LSB);

This hunk also indicates that it may be better to merge the IPU within
the existing driver.

-Emil