linux-kernel - Re: [PATCH v5 2/2] drm/panel: ilitek-ili9882t: Add support for Ilitek IL79900A-based panels

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Message-ID: <7642d4ba-72fe-4af7-a02a-96676f8945af@linaro.org>
Date: Fri, 31 Oct 2025 11:15:25 +0100
From: neil.armstrong@...aro.org
To: Langyan Ye <yelangyan@...qin.corp-partner.google.com>, airlied@...il.com,
 simona@...ll.ch, maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
 tzimmermann@...e.de, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, dianders@...omium.org
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] drm/panel: ilitek-ili9882t: Add support for Ilitek
 IL79900A-based panels

On 10/31/25 11:04, Langyan Ye wrote:
> The Ilitek IL79900A display controller is similar to the ILI9882T and can
> be supported within the existing `panel-ilitek-ili9882t.c` driver.
> 
> This patch extends the ILI9882T driver to handle IL79900A-based panels,
> such as the Tianma TL121BVMS07-00. The IL79900A uses a similar command
> sequence and initialization flow, with minor differences in power supply
> configuration and timing.
> 
> Signed-off-by: Langyan Ye <yelangyan@...qin.corp-partner.google.com>
> ---
>   drivers/gpu/drm/panel/panel-ilitek-ili9882t.c | 69 +++++++++++++++++++
>   1 file changed, 69 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
> index 85c7059be214..c52f20863fc7 100644
> --- a/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
> +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9882t.c
> @@ -61,6 +61,13 @@ struct ili9882t {
>   	mipi_dsi_dcs_write_seq_multi(ctx, ILI9882T_DCS_SWITCH_PAGE, \
>   				     0x98, 0x82, (page))
>   
> +/* IL79900A-specific commands, add new commands as you decode them */
> +#define IL79900A_DCS_SWITCH_PAGE	0xFF
> +
> +#define il79900a_switch_page(ctx, page) \
> +	mipi_dsi_dcs_write_seq_multi(ctx, IL79900A_DCS_SWITCH_PAGE, \
> +				     0x5a, 0xa5, (page))
> +
>   static int starry_ili9882t_init(struct ili9882t *ili)
>   {
>   	struct mipi_dsi_multi_context ctx = { .dsi = ili->dsi };
> @@ -413,6 +420,38 @@ static int starry_ili9882t_init(struct ili9882t *ili)
>   	return ctx.accum_err;
>   };
>   
> +static int tianma_il79900a_init(struct ili9882t *ili)
> +{
> +	struct mipi_dsi_multi_context ctx = { .dsi = ili->dsi };
> +
> +	mipi_dsi_usleep_range(&ctx, 5000, 5100);
> +
> +	il79900a_switch_page(&ctx, 0x06);
> +	mipi_dsi_dcs_write_seq_multi(&ctx, 0x3e, 0x62);
> +
> +	il79900a_switch_page(&ctx, 0x02);
> +	mipi_dsi_dcs_write_seq_multi(&ctx, 0x1b, 0x20);
> +	mipi_dsi_dcs_write_seq_multi(&ctx, 0x5d, 0x00);
> +	mipi_dsi_dcs_write_seq_multi(&ctx, 0x5e, 0x40);
> +
> +	il79900a_switch_page(&ctx, 0x07);
> +	mipi_dsi_dcs_write_seq_multi(&ctx, 0X29, 0x00);
> +
> +	il79900a_switch_page(&ctx, 0x06);
> +	mipi_dsi_dcs_write_seq_multi(&ctx, 0x92, 0x22);
> +
> +	il79900a_switch_page(&ctx, 0x00);
> +	mipi_dsi_dcs_exit_sleep_mode_multi(&ctx);
> +
> +	mipi_dsi_msleep(&ctx, 120);
> +
> +	mipi_dsi_dcs_set_display_on_multi(&ctx);
> +
> +	mipi_dsi_msleep(&ctx, 80);
> +
> +	return 0;
> +};
> +
>   static inline struct ili9882t *to_ili9882t(struct drm_panel *panel)
>   {
>   	return container_of(panel, struct ili9882t, base);
> @@ -529,6 +568,19 @@ static const struct drm_display_mode starry_ili9882t_default_mode = {
>   	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
>   };
>   
> +static const struct drm_display_mode tianma_il79900a_default_mode = {
> +	.clock = 264355,
> +	.hdisplay = 1600,
> +	.hsync_start = 1600 + 20,
> +	.hsync_end = 1600 + 20 + 4,
> +	.htotal = 1600 + 20 + 4 + 20,
> +	.vdisplay = 2560,
> +	.vsync_start = 2560 + 82,
> +	.vsync_end = 2560 + 82 + 2,
> +	.vtotal = 2560 + 82 + 2 + 36,
> +	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> +};
> +
>   static const struct panel_desc starry_ili9882t_desc = {
>   	.modes = &starry_ili9882t_default_mode,
>   	.bpc = 8,
> @@ -543,6 +595,20 @@ static const struct panel_desc starry_ili9882t_desc = {
>   	.init = starry_ili9882t_init,
>   };
>   
> +static const struct panel_desc tianma_tl121bvms07_desc = {
> +	.modes = &tianma_il79900a_default_mode,
> +	.bpc = 8,
> +	.size = {
> +		.width_mm = 163,
> +		.height_mm = 260,
> +	},
> +	.lanes = 3,
> +	.format = MIPI_DSI_FMT_RGB888,
> +	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
> +		      MIPI_DSI_MODE_LPM,
> +	.init = tianma_il79900a_init,
> +};
> +
>   static int ili9882t_get_modes(struct drm_panel *panel,
>   			      struct drm_connector *connector)
>   {
> @@ -680,6 +746,9 @@ static const struct of_device_id ili9882t_of_match[] = {
>   	{ .compatible = "starry,ili9882t",
>   	  .data = &starry_ili9882t_desc
>   	},
> +	{ .compatible = "tianma,tl121bvms07-00",
> +	  .data = &tianma_tl121bvms07_desc
> +	},
>   	{ /* sentinel */ }
>   };
>   MODULE_DEVICE_TABLE(of, ili9882t_of_match);

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>