linux-kernel - Re: [PATCH 1/2] drm/bridge: parade-ps8640: Use regmap APIs

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Date:   Wed, 8 Sep 2021 21:54:42 +0000
From:   Stephen Boyd <swboyd@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Philip Chen <philipchen@...omium.org>
Cc:     dianders@...omium.org, Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/2] drm/bridge: parade-ps8640: Use regmap APIs

Quoting Philip Chen (2021-09-08 11:18:05)
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> index 685e9c38b2db..a16725dbf912 100644
> --- a/drivers/gpu/drm/bridge/parade-ps8640.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -64,12 +65,29 @@ struct ps8640 {
>         struct drm_bridge *panel_bridge;
>         struct mipi_dsi_device *dsi;
>         struct i2c_client *page[MAX_DEVS];
> +       struct regmap   *regmap[MAX_DEVS];
>         struct regulator_bulk_data supplies[2];
>         struct gpio_desc *gpio_reset;
>         struct gpio_desc *gpio_powerdown;
>         bool powered;
>  };
>
> +static const struct regmap_range ps8640_volatile_ranges[] = {
> +       { .range_min = 0, .range_max = 0xff },

Is the plan to fill this out later or is 0xff the max register? If it's
the latter then I think adding the max register to regmap_config is
simpler.

> +};
> +
> +static const struct regmap_access_table ps8640_volatile_table = {
> +       .yes_ranges = ps8640_volatile_ranges,
> +       .n_yes_ranges = ARRAY_SIZE(ps8640_volatile_ranges),
> +};
> +
> +static const struct regmap_config ps8640_regmap_config = {
> +       .reg_bits = 8,
> +       .val_bits = 8,
> +       .volatile_table = &ps8640_volatile_table,
> +       .cache_type = REGCACHE_NONE,
> +};
> +
>  static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
>  {
>         return container_of(e, struct ps8640, bridge);
> @@ -78,13 +96,13 @@ static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
>  static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
>                                      const enum ps8640_vdo_control ctrl)
>  {
> -       struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
> -       u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
> +       struct regmap *map = ps_bridge->regmap[PAGE3_DSI_CNTL1];
> +       u8 vdo_ctrl_buf[] = {VDO_CTL_ADD, ctrl};

Nitpick: Add a space after { and before }.

>         int ret;
>
> -       ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
> -                                            sizeof(vdo_ctrl_buf),
> -                                            vdo_ctrl_buf);
> +       ret = regmap_bulk_write(map, PAGE3_SET_ADD,
> +                               vdo_ctrl_buf, sizeof(vdo_ctrl_buf));
> +
>         if (ret < 0) {
>                 DRM_ERROR("failed to %sable VDO: %d\n",
>                           ctrl == ENABLE ? "en" : "dis", ret);