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Date:   Mon, 12 Mar 2018 10:21:10 +0100
From:   Thierry Reding <thierry.reding@gmail.com>
To:     Lin Huang <hl@rock-chips.com>
Cc:     emil.l.velikov@gmail.com, briannorris@chromium.org,
        robh+dt@kernel.org, zyw@rock-chips.com, seanpaul@chromium.org,
        airlied@linux.ie, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, nickey.yang@rock-chips.com
Subject: Re: [RESEND PATCH v3 1/3] drm/panel: refactor INNOLUX P079ZCA panel
 driver
Message-ID: <20180312092110.GC15972@ulmo>
References: <1512371870-15350-1-git-send-email-hl@rock-chips.com>
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On Mon, Dec 04, 2017 at 03:17:48PM +0800, Lin Huang wrote:
> Refactor Innolux P079ZCA panel driver, let it support
> multi panel.
>=20
> Signed-off-by: Lin Huang <hl@rock-chips.com>
> ---
> Changes in v2:
> - Change regulator property name to meet the panel datasheet=20
> Changes in v3:
> - this patch only refactor P079ZCA panel to support multi panel, support =
P097PFG panel in another patch=20
>=20
>  drivers/gpu/drm/panel/panel-innolux-p079zca.c | 147 ++++++++++++++++++--=
------
>  1 file changed, 105 insertions(+), 42 deletions(-)
>=20
> diff --git a/drivers/gpu/drm/panel/panel-innolux-p079zca.c b/drivers/gpu/=
drm/panel/panel-innolux-p079zca.c
> index 6ba9344..1597744 100644
> --- a/drivers/gpu/drm/panel/panel-innolux-p079zca.c
> +++ b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
> @@ -20,12 +20,32 @@
> =20
>  #include <video/mipi_display.h>
> =20
> +struct panel_desc {
> +	const struct drm_display_mode *modes;
> +	unsigned int bpc;
> +	struct {
> +		unsigned int width;
> +		unsigned int height;
> +	} size;
> +};
> +
> +struct panel_desc_dsi {
> +	struct panel_desc desc;
> +
> +	unsigned long flags;
> +	enum mipi_dsi_pixel_format format;
> +	unsigned int lanes;
> +};

There's no need for the two layers here. Just move everything from
struct panel_desc_dsi into struct panel_desc.

> +
>  struct innolux_panel {
>  	struct drm_panel base;
>  	struct mipi_dsi_device *link;
> +	const struct panel_desc_dsi *dsi_desc;

And then this can just become:

	const struct panel_desc *desc;

The _dsi suffix is redundant because this driver is exclusively for DSI
devices.

> -static int innolux_panel_add(struct innolux_panel *innolux)
> +static int innolux_panel_add(struct mipi_dsi_device *dsi,
> +			     const struct panel_desc_dsi *desc)
>  {
> -	struct device *dev =3D &innolux->link->dev;
> +	struct innolux_panel *innolux;
> +	struct device *dev =3D &dsi->dev;
>  	struct device_node *np;
>  	int err;
> =20
> -	innolux->supply =3D devm_regulator_get(dev, "power");
> -	if (IS_ERR(innolux->supply))
> -		return PTR_ERR(innolux->supply);
> +	innolux =3D devm_kzalloc(dev, sizeof(*innolux), GFP_KERNEL);
> +	if (!innolux)
> +		return -ENOMEM;
> +
> +	innolux->dsi_desc =3D desc;
> +	innolux->vddi =3D devm_regulator_get(dev, "power");
> +	if (IS_ERR(innolux->vddi))
> +		return PTR_ERR(innolux->vddi);
> +
> +	innolux->avdd =3D devm_regulator_get(dev, "avdd");
> +	if (IS_ERR(innolux->avdd))
> +		return PTR_ERR(innolux->avdd);
> +
> +	innolux->avee =3D devm_regulator_get(dev, "avee");
> +	if (IS_ERR(innolux->avee))
> +		return PTR_ERR(innolux->avee);

According to the device tree bindings these regulators are all optional.
Now devm_regulator_get() will return a dummy regulator if one has not
been specified in DT, so this seems like it should work fine, even for
existing DTBs that don't have the avdd and avee regulators. However, the
DT bindings seem to be wrong, because these are in fact required
regulators.

> =20
>  	innolux->enable_gpio =3D devm_gpiod_get_optional(dev, "enable",
>  						       GPIOD_OUT_HIGH);
> @@ -243,14 +306,16 @@ static int innolux_panel_add(struct innolux_panel *=
innolux)
> =20
>  	drm_panel_init(&innolux->base);
>  	innolux->base.funcs =3D &innolux_panel_funcs;
> -	innolux->base.dev =3D &innolux->link->dev;
> +	innolux->base.dev =3D dev;
> =20
>  	err =3D drm_panel_add(&innolux->base);
>  	if (err < 0)
>  		goto put_backlight;
> =20
> -	return 0;
> +	dev_set_drvdata(dev, innolux);
> +	innolux->link =3D dsi;
> =20
> +	return 0;
>  put_backlight:
>  	put_device(&innolux->backlight->dev);
> =20
> @@ -267,28 +332,25 @@ static void innolux_panel_del(struct innolux_panel =
*innolux)
> =20
>  static int innolux_panel_probe(struct mipi_dsi_device *dsi)
>  {
> -	struct innolux_panel *innolux;
> -	int err;
> =20
> -	dsi->lanes =3D 4;
> -	dsi->format =3D MIPI_DSI_FMT_RGB888;
> -	dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULS=
E |
> -			  MIPI_DSI_MODE_LPM;
> -
> -	innolux =3D devm_kzalloc(&dsi->dev, sizeof(*innolux), GFP_KERNEL);
> -	if (!innolux)
> -		return -ENOMEM;
> +	const struct panel_desc_dsi *dsi_desc;
> +	const struct of_device_id *id;
> +	int err;
> =20
> -	mipi_dsi_set_drvdata(dsi, innolux);
> +	id =3D of_match_node(innolux_of_match, dsi->dev.of_node);
> +	if (!id)
> +		return -ENODEV;
> =20
> -	innolux->link =3D dsi;
> +	dsi_desc =3D id->data;
> +	dsi->mode_flags =3D dsi_desc->flags;
> +	dsi->format =3D dsi_desc->format;
> +	dsi->lanes =3D dsi_desc->lanes;
> =20
> -	err =3D innolux_panel_add(innolux);
> +	err =3D innolux_panel_add(dsi, dsi_desc);
>  	if (err < 0)
>  		return err;
> =20
> -	err =3D mipi_dsi_attach(dsi);
> -	return err;
> +	return mipi_dsi_attach(dsi);
>  }
> =20
>  static int innolux_panel_remove(struct mipi_dsi_device *dsi)
> @@ -326,7 +388,7 @@ static void innolux_panel_shutdown(struct mipi_dsi_de=
vice *dsi)
> =20
>  static struct mipi_dsi_driver innolux_panel_driver =3D {
>  	.driver =3D {
> -		.name =3D "panel-innolux-p079zca",
> +		.name =3D "panel-innolux-dsi",

No need to change that. Also, probably a bad idea to change it because
there are (or will be) likely other DSI panels from Innolux that are not
compatible with this driver.

Thierry

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