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Date: Fri, 28 Jun 2024 10:22:42 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Hironori KIKUCHI <kikuchan98@...il.com>, linux-kernel@...r.kernel.org
Cc: Jagan Teki <jagan@...rulasolutions.com>,
Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, dri-devel@...ts.freedesktop.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/3] drm/panel: st7701: Add Anbernic RG28XX panel
support
On 28/06/2024 07:10, Hironori KIKUCHI wrote:
> The Anbernic RG28XX is a handheld gaming device with a 2.8 inch 480x640
> display. Add support for the display panel.
>
> This panel is driven by a variant of ST7701 driver IC internally,
> confirmed by dumping and analyzing its BSP initialization sequence
> by using a logic analyzer. It is very similar to the existing
> densitron,dmt028vghmcmi-1a panel, but differs in some unknown
> register values. Besides, it is connected via SPI, so add a new entry
> for the panel.
>
> Signed-off-by: Hironori KIKUCHI <kikuchan98@...il.com>
> ---
> drivers/gpu/drm/panel/panel-sitronix-st7701.c | 151 ++++++++++++++++++
> 1 file changed, 151 insertions(+)
>
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7701.c b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
> index 07980f010bb..8450a4317c1 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7701.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
> @@ -471,6 +471,55 @@ static void rg_arc_gip_sequence(struct st7701 *st7701)
> msleep(120);
> }
>
> +static void rg28xx_gip_sequence(struct st7701 *st7701)
> +{
> + st7701_switch_cmd_bkx(st7701, true, 3);
> + ST7701_WRITE(st7701, 0xEF, 0x08);
> +
> + st7701_switch_cmd_bkx(st7701, true, 0);
> + ST7701_WRITE(st7701, 0xC3, 0x02, 0x10, 0x02);
> + ST7701_WRITE(st7701, 0xC7, 0x04);
> + ST7701_WRITE(st7701, 0xCC, 0x10);
> +
> + st7701_switch_cmd_bkx(st7701, true, 1);
> + ST7701_WRITE(st7701, 0xEE, 0x42);
> + ST7701_WRITE(st7701, 0xE0, 0x00, 0x00, 0x02);
> +
> + ST7701_WRITE(st7701, 0xE1, 0x04, 0xA0, 0x06, 0xA0, 0x05, 0xA0, 0x07, 0xA0,
> + 0x00, 0x44, 0x44);
> + ST7701_WRITE(st7701, 0xE2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00);
> + ST7701_WRITE(st7701, 0xE3, 0x00, 0x00, 0x22, 0x22);
> + ST7701_WRITE(st7701, 0xE4, 0x44, 0x44);
> + ST7701_WRITE(st7701, 0xE5, 0x0C, 0x90, 0xA0, 0xA0, 0x0E, 0x92, 0xA0, 0xA0,
> + 0x08, 0x8C, 0xA0, 0xA0, 0x0A, 0x8E, 0xA0, 0xA0);
> + ST7701_WRITE(st7701, 0xE6, 0x00, 0x00, 0x22, 0x22);
> + ST7701_WRITE(st7701, 0xE7, 0x44, 0x44);
> + ST7701_WRITE(st7701, 0xE8, 0x0D, 0x91, 0xA0, 0xA0, 0x0F, 0x93, 0xA0, 0xA0,
> + 0x09, 0x8D, 0xA0, 0xA0, 0x0B, 0x8F, 0xA0, 0xA0);
> + ST7701_WRITE(st7701, 0xEB, 0x00, 0x00, 0xE4, 0xE4, 0x44, 0x00, 0x40);
> + ST7701_WRITE(st7701, 0xED, 0xFF, 0xF5, 0x47, 0x6F, 0x0B, 0xA1, 0xBA, 0xFF,
> + 0xFF, 0xAB, 0x1A, 0xB0, 0xF6, 0x74, 0x5F, 0xFF);
> + ST7701_WRITE(st7701, 0xEF, 0x08, 0x08, 0x08, 0x45, 0x3F, 0x54);
> +
> + st7701_switch_cmd_bkx(st7701, false, 0);
> +
> + st7701_switch_cmd_bkx(st7701, true, 3);
> + ST7701_WRITE(st7701, 0xE6, 0x16);
> + ST7701_WRITE(st7701, 0xE8, 0x00, 0x0E);
> +
> + st7701_switch_cmd_bkx(st7701, false, 0);
> + ST7701_WRITE(st7701, MIPI_DCS_SET_ADDRESS_MODE, 0x10);
> + ST7701_WRITE(st7701, MIPI_DCS_EXIT_SLEEP_MODE);
> + msleep(120);
> +
> + st7701_switch_cmd_bkx(st7701, true, 3);
> + ST7701_WRITE(st7701, 0xE8, 0x00, 0x0C);
> + msleep(10);
> + ST7701_WRITE(st7701, 0xE8, 0x00, 0x00);
> + st7701_switch_cmd_bkx(st7701, false, 0);
> +}
> +
> static int st7701_prepare(struct drm_panel *panel)
> {
> struct st7701 *st7701 = panel_to_st7701(panel);
> @@ -986,6 +1035,106 @@ static const struct st7701_panel_desc rg_arc_desc = {
> .gip_sequence = rg_arc_gip_sequence,
> };
>
> +static const struct drm_display_mode rg28xx_mode = {
> + .clock = 22325,
> +
> + .hdisplay = 480,
> + .hsync_start = 480 + 40,
> + .hsync_end = 480 + 40 + 4,
> + .htotal = 480 + 40 + 4 + 20,
> +
> + .vdisplay = 640,
> + .vsync_start = 640 + 2,
> + .vsync_end = 640 + 2 + 40,
> + .vtotal = 640 + 2 + 40 + 16,
> +
> + .width_mm = 44,
> + .height_mm = 58,
> +
> + .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> +
> + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> +};
> +
> +static const struct st7701_panel_desc rg28xx_desc = {
> + .mode = &rg28xx_mode,
> +
> + .panel_sleep_delay = 80,
> +
> + .pv_gamma = {
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC0_MASK, 0),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC4_MASK, 0x10),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC8_MASK, 0x17),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC16_MASK, 0xd),
> +
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC24_MASK, 0x11),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC52_MASK, 0x6),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC80_MASK, 0x5),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC108_MASK, 0x8),
> +
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC147_MASK, 0x7),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC175_MASK, 0x1f),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC203_MASK, 0x4),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC231_MASK, 0x11),
> +
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC239_MASK, 0xe),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC247_MASK, 0x29),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC251_MASK, 0x30),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC255_MASK, 0x1f)
> + },
> + .nv_gamma = {
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC0_MASK, 0),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC4_MASK, 0xd),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC8_MASK, 0x14),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC16_MASK, 0xe),
> +
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC24_MASK, 0x11),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC52_MASK, 0x6),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC80_MASK, 0x4),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC108_MASK, 0x8),
> +
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC147_MASK, 0x8),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC175_MASK, 0x20),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC203_MASK, 0x5),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC231_MASK, 0x13),
> +
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC239_MASK, 0x13),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC247_MASK, 0x26),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC251_MASK, 0x30),
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_AJ_MASK, 0) |
> + CFIELD_PREP(ST7701_CMD2_BK0_GAMCTRL_VC255_MASK, 0x1f)
> + },
> + .nlinv = 7,
> + .vop_uv = 4800000,
> + .vcom_uv = 1512500,
> + .vgh_mv = 15000,
> + .vgl_mv = -11730,
> + .avdd_mv = 6600,
> + .avcl_mv = -4400,
> + .gamma_op_bias = OP_BIAS_MIDDLE,
> + .input_op_bias = OP_BIAS_MIN,
> + .output_op_bias = OP_BIAS_MIN,
> + .t2d_ns = 1600,
> + .t3d_ns = 10400,
> + .eot_en = true,
> + .gip_sequence = rg28xx_gip_sequence,
> +};
> +
> static void st7701_cleanup(void *data)
> {
> struct st7701 *st7701 = (struct st7701 *)data;
> @@ -1120,11 +1269,13 @@ static const struct of_device_id st7701_dsi_of_match[] = {
> MODULE_DEVICE_TABLE(of, st7701_dsi_of_match);
>
> static const struct of_device_id st7701_spi_of_match[] = {
> + { .compatible = "anbernic,rg28xx-panel", .data = &rg28xx_desc },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, st7701_spi_of_match);
>
> static const struct spi_device_id st7701_spi_ids[] = {
> + { "rg28xx-panel" },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(spi, st7701_spi_ids);
Looks fine !
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Thanks,
Neil
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