linux-kernel - Re: [PATCH v1 4/4] drm/panel: ili9806e: Break some CMDS into helper functions

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Message-Id: <D2LQJROQYIY3.2Q88EXS8HUDLQ@kernel.org>
Date: Wed, 10 Jul 2024 11:02:03 +0200
From: "Michael Walle" <mwalle@...nel.org>
To: "Cong Yang" <yangcong5@...qin.corp-partner.google.com>,
 <quic_jesszhan@...cinc.com>, <neil.armstrong@...aro.org>,
 <dianders@...omium.org>, <linus.walleij@...aro.org>, <airlied@...il.com>,
 <dmitry.baryshkov@...aro.org>
Cc: <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 4/4] drm/panel: ili9806e: Break some CMDS into helper
 functions

On Wed Jul 10, 2024 at 10:47 AM CEST, Cong Yang wrote:
> Break select page cmds into helper function.

Why though? I don't find that anything easier to read. In fact, I
deliberately chose not to factor that out into a function. It's just
a sequence of magic commands, taken straight from the datasheet. So,
I'd like to keep it that way.

-michael

> Signed-off-by: Cong Yang <yangcong5@...qin.corp-partner.google.com>
> ---
>  drivers/gpu/drm/panel/panel-ilitek-ili9806e.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9806e.c b/drivers/gpu/drm/panel/panel-ilitek-ili9806e.c
> index e4a44cd26c4d..68fb9a1a4d80 100644
> --- a/drivers/gpu/drm/panel/panel-ilitek-ili9806e.c
> +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9806e.c
> @@ -35,6 +35,12 @@ struct ili9806e_panel {
>  	enum drm_panel_orientation orientation;
>  };
>  
> +#define ILI9806E_DCS_SWITCH_PAGE	0xff
> +
> +#define ili9806e_switch_page(ctx, page) \
> +	mipi_dsi_dcs_write_seq_multi(ctx, ILI9806E_DCS_SWITCH_PAGE, \
> +				     0xff, 0x98, 0x06, 0x04, (page))
> +
>  static const char * const regulator_names[] = {
>  	"vdd",
>  	"vccio",
> @@ -227,7 +233,7 @@ static void ili9806e_dsi_remove(struct mipi_dsi_device *dsi)
>  static void com35h3p70ulc_init(struct mipi_dsi_multi_context *ctx)
>  {
>  	/* Switch to page 1 */
> -	mipi_dsi_dcs_write_seq_multi(ctx, 0xff, 0xff, 0x98, 0x06, 0x04, 0x01);
> +	ili9806e_switch_page(ctx, 0x01);
>  	/* Interface Settings */
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x08, 0x18);
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x21, 0x01);
> @@ -285,14 +291,14 @@ static void com35h3p70ulc_init(struct mipi_dsi_multi_context *ctx)
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0xcf, 0x0a);
>  
>  	/* Switch to page 7 */
> -	mipi_dsi_dcs_write_seq_multi(ctx, 0xff, 0xff, 0x98, 0x06, 0x04, 0x07);
> +	ili9806e_switch_page(ctx, 0x07);
>  	/* Power Control */
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x06, 0x00);
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x18, 0x1d);
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x17, 0x32);
>  
>  	/* Switch to page 6 */
> -	mipi_dsi_dcs_write_seq_multi(ctx, 0xff, 0xff, 0x98, 0x06, 0x04, 0x06);
> +	ili9806e_switch_page(ctx, 0x06);
>  	/* GIP settings */
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x00, 0x20);
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x01, 0x02);
> @@ -352,7 +358,7 @@ static void com35h3p70ulc_init(struct mipi_dsi_multi_context *ctx)
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x53, 0x12);
>  
>  	/* Switch to page 0 */
> -	mipi_dsi_dcs_write_seq_multi(ctx, 0xff, 0xff, 0x98, 0x06, 0x04, 0x00);
> +	ili9806e_switch_page(ctx, 0x00);
>  	/* Interface Pixel format */
>  	mipi_dsi_dcs_write_seq_multi(ctx, 0x3a, 0x60);
>  };