linux-kernel - [PATCH v2 2/2] drm/panel: simple: Add Tianma TM070JDHG34-00 panel support

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Message-Id: <20241216-tianma_tm070jdhg34-v2-2-0b319a0bac39@bootlin.com>
Date: Mon, 16 Dec 2024 17:21:35 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, Sam Ravnborg <sam@...nborg.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH v2 2/2] drm/panel: simple: Add Tianma TM070JDHG34-00 panel
 support

Add Tianma TM070JDHG34-00 7.0" 1280x800 LVDS RGB TFT LCD panel.

Panel info and datasheet: https://fortec.us/products/tm070jdhg34-00/

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---

Changes in v2: none
---
 drivers/gpu/drm/panel/panel-simple.c | 42 ++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 1562f122724137dec37eb11443eafc896ef2f2e8..b3c931a4e46a2568b3678d664f11b189873fa1e2 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -4286,6 +4286,45 @@ static const struct panel_desc tianma_tm070jvhg33 = {
 	.bus_flags = DRM_BUS_FLAG_DE_HIGH,
 };
 
+/*
+ * The datasheet computes total blanking as back porch + front porch, not
+ * including sync pulse width. This is for both H and V. To make the total
+ * blanking and period correct, subtract the pulse width from the front
+ * porch.
+ *
+ * This works well for the Min and Typ values, but for Max values the sync
+ * pulse width is higher than back porch + front porch, so work around that
+ * by reducing the Max sync length value to 1 and then treating the Max
+ * porches as in the Min and Typ cases.
+ *
+ * Exact datasheet values are added as a comment where they differ from the
+ * ones implemented for the above reason.
+ */
+static const struct display_timing tianma_tm070jdhg34_00_timing = {
+	.pixelclock = { 68400000, 71900000, 78100000 },
+	.hactive = { 1280, 1280, 1280 },
+	.hfront_porch = { 130, 138, 158 }, /* 131, 139, 159 */
+	.hback_porch = { 5, 5, 5 },
+	.hsync_len = { 1, 1, 1 }, /* 1, 1, 256 */
+	.vactive = { 800, 800, 800 },
+	.vfront_porch = { 2, 39, 98 }, /* 3, 40, 99 */
+	.vback_porch = { 2, 2, 2 },
+	.vsync_len = { 1, 1, 1 }, /* 1, 1, 128 */
+	.flags = DISPLAY_FLAGS_DE_HIGH,
+};
+
+static const struct panel_desc tianma_tm070jdhg34_00 = {
+	.timings = &tianma_tm070jdhg34_00_timing,
+	.num_timings = 1,
+	.bpc = 8,
+	.size = {
+		.width = 150, /* 149.76 */
+		.height = 94, /* 93.60 */
+	},
+	.bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
+	.connector_type = DRM_MODE_CONNECTOR_LVDS,
+};
+
 static const struct display_timing tianma_tm070rvhg71_timing = {
 	.pixelclock = { 27700000, 29200000, 39600000 },
 	.hactive = { 800, 800, 800 },
@@ -5028,6 +5067,9 @@ static const struct of_device_id platform_of_match[] = {
 	}, {
 		.compatible = "tianma,tm070jdhg30",
 		.data = &tianma_tm070jdhg30,
+	}, {
+		.compatible = "tianma,tm070jdhg34-00",
+		.data = &tianma_tm070jdhg34_00,
 	}, {
 		.compatible = "tianma,tm070jvhg33",
 		.data = &tianma_tm070jvhg33,

-- 
2.34.1