Re: [PATCH v2 1/2] drivers: gpu: drm: add driver for samsung s6e3fc2x01 cmd mode panel

[Alexey Minnekhanov]

Hi,

On 07.10.2022 14:14, Nia Espera wrote:

> +
> +#define dsi_dcs_write_seq(dsi, seq...) do {				\
> +		static const u8 d[] = { seq };				\
> +		int ret;						\
> +		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
> +		if (ret < 0)						\
> +			return ret;					\
> +	} while (0)
> +

There is now a standard macro for this - mipi_dsi_dcs_write_seq() [1] , 
so you don't need to reinvent it.

> +static void samsung_s6e3fc2x01_reset(struct samsung_s6e3fc2x01 *ctx)
> +{
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	usleep_range(5000, 6000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	usleep_range(2000, 3000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	usleep_range(10000, 11000);
> +}

There is a high chance that first gpiod_set_value() is not needed, only 
the last 2.

[1] https://elixir.bootlin.com/linux/latest/C/ident/mipi_dsi_dcs_write_seq

--
Regards
Alexey Minnekhanov