linux-kernel - Re: [RFC PATCH v3 3/7] drm/panel: nv3052c: Allow specifying registers per panel

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Message-ID: <dac3b4812951d8dabf1f4017c4813a8c9183f393.camel@crapouillou.net>
Date:   Mon, 25 Sep 2023 11:04:25 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     John Watts <contact@...kia.org>, dri-devel@...ts.freedesktop.org
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Chris Morgan <macromorgan@...mail.com>,
        Jagan Teki <jagan@...eble.ai>,
        Christophe Branchereau <cbranchereau@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v3 3/7] drm/panel: nv3052c: Allow specifying
 registers per panel

Hi John,

Le lundi 25 septembre 2023 à 12:10 +1000, John Watts a écrit :
> Panel initialization registers are per-display and not tied to the
> controller itself. Different panels will specify their own registers.
> Attach the sequences to the panel info struct so future panels
> can specify their own sequences.
> 
> Signed-off-by: John Watts <contact@...kia.org>
> Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> ---
>  .../gpu/drm/panel/panel-newvision-nv3052c.c   | 24 ++++++++++++-----
> --
>  1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
> b/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
> index 90dea21f9856..382062a79ba8 100644
> --- a/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
> +++ b/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
> @@ -20,11 +20,18 @@
>  #include <drm/drm_modes.h>
>  #include <drm/drm_panel.h>
>  
> +struct nv3052c_reg {
> +       u8 cmd;
> +       u8 val;
> +};
> +
>  struct nv3052c_panel_info {
>         const struct drm_display_mode *display_modes;
>         unsigned int num_modes;
>         u16 width_mm, height_mm;
>         u32 bus_format, bus_flags;
> +       const struct nv3052c_reg *panel_regs;
> +       int panel_regs_len;

This can be unsigned.

>  };
>  
>  struct nv3052c {
> @@ -36,12 +43,7 @@ struct nv3052c {
>         struct gpio_desc *reset_gpio;
>  };
>  
> -struct nv3052c_reg {
> -       u8 cmd;
> -       u8 val;
> -};
> -
> -static const struct nv3052c_reg nv3052c_panel_regs[] = {
> +static const struct nv3052c_reg ltk035c5444t_panel_regs[] = {
>         // EXTC Command set enable, select page 1
>         { 0xff, 0x30 }, { 0xff, 0x52 }, { 0xff, 0x01 },
>         // Mostly unknown registers
> @@ -244,6 +246,8 @@ static inline struct nv3052c *to_nv3052c(struct
> drm_panel *panel)
>  static int nv3052c_prepare(struct drm_panel *panel)
>  {
>         struct nv3052c *priv = to_nv3052c(panel);
> +       const struct nv3052c_reg *panel_regs = priv->panel_info-
> >panel_regs;
> +       int panel_regs_len = priv->panel_info->panel_regs_len;

Same here.

With this fixed I'm happy with the patch.

Cheers,
-Paul

>         struct mipi_dbi *dbi = &priv->dbi;
>         unsigned int i;
>         int err;
> @@ -260,9 +264,9 @@ static int nv3052c_prepare(struct drm_panel
> *panel)
>         gpiod_set_value_cansleep(priv->reset_gpio, 0);
>         usleep_range(5000, 20000);
>  
> -       for (i = 0; i < ARRAY_SIZE(nv3052c_panel_regs); i++) {
> -               err = mipi_dbi_command(dbi,
> nv3052c_panel_regs[i].cmd,
> -                                      nv3052c_panel_regs[i].val);
> +       for (i = 0; i < panel_regs_len; i++) {
> +               err = mipi_dbi_command(dbi, panel_regs[i].cmd,
> +                                      panel_regs[i].val);
>  
>                 if (err) {
>                         dev_err(priv->dev, "Unable to set register:
> %d\n", err);
> @@ -463,6 +467,8 @@ static const struct nv3052c_panel_info
> ltk035c5444t_panel_info = {
>         .height_mm = 64,
>         .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
>         .bus_flags = DRM_BUS_FLAG_DE_HIGH |
> DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
> +       .panel_regs = ltk035c5444t_panel_regs,
> +       .panel_regs_len = ARRAY_SIZE(ltk035c5444t_panel_regs),
>  };
>  
>  static const struct spi_device_id nv3052c_ids[] = {