From patchwork Thu Jan  2 14:12:46 2020
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Geert Uytterhoeven <geert+renesas@glider.be>
X-Patchwork-Id: 11315831
Return-Path: <SRS0=3qEH=2X=lists.freedesktop.org=dri-devel-bounces@kernel.org>
Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org
 [172.30.200.123])
	by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C4CB1109A
	for <patchwork-dri-devel@patchwork.kernel.org>;
 Thu,  2 Jan 2020 14:13:00 +0000 (UTC)
Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.kernel.org (Postfix) with ESMTPS id AD09620848
	for <patchwork-dri-devel@patchwork.kernel.org>;
 Thu,  2 Jan 2020 14:13:00 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AD09620848
Authentication-Results: mail.kernel.org;
 dmarc=none (p=none dis=none) header.from=glider.be
Authentication-Results: mail.kernel.org;
 spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org
Received: from gabe.freedesktop.org (localhost [127.0.0.1])
	by gabe.freedesktop.org (Postfix) with ESMTP id 6E0C76E0FE;
	Thu,  2 Jan 2020 14:12:55 +0000 (UTC)
X-Original-To: dri-devel@lists.freedesktop.org
Delivered-To: dri-devel@lists.freedesktop.org
Received: from laurent.telenet-ops.be (laurent.telenet-ops.be
 [IPv6:2a02:1800:110:4::f00:19])
 by gabe.freedesktop.org (Postfix) with ESMTPS id C5ED26E0FD
 for <dri-devel@lists.freedesktop.org>; Thu,  2 Jan 2020 14:12:53 +0000 (UTC)
Received: from ramsan ([84.195.182.253]) by laurent.telenet-ops.be with
 bizsmtp
 id lSCn2100L5USYZQ01SCnTk; Thu, 02 Jan 2020 15:12:51 +0100
Received: from rox.of.borg ([192.168.97.57]) by ramsan with esmtp (Exim
 4.90_1)
 (envelope-from <geert@linux-m68k.org>)
 id 1in1DT-0006OY-Do; Thu, 02 Jan 2020 15:12:47 +0100
Received: from geert by rox.of.borg with local (Exim 4.90_1)
 (envelope-from <geert@linux-m68k.org>)
 id 1in1DT-000072-CB; Thu, 02 Jan 2020 15:12:47 +0100
From: Geert Uytterhoeven <geert+renesas@glider.be>
To: =?utf-8?q?Noralf_Tr=C3=B8nnes?= <noralf@tronnes.org>,
 David Lechner <david@lechnology.com>, David Airlie <airlied@linux.ie>,
 Daniel Vetter <daniel@ffwll.ch>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Rob Herring <robh+dt@kernel.org>,
 Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH 3/3] drm: tiny: st7735r: Add support for Okaya RH128128T
Date: Thu,  2 Jan 2020 15:12:46 +0100
Message-Id: <20200102141246.370-4-geert+renesas@glider.be>
X-Mailer: git-send-email 2.17.1
In-Reply-To: <20200102141246.370-1-geert+renesas@glider.be>
References: <20200102141246.370-1-geert+renesas@glider.be>
X-BeenThere: dri-devel@lists.freedesktop.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Direct Rendering Infrastructure - Development
 <dri-devel.lists.freedesktop.org>
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://lists.freedesktop.org/archives/dri-devel>
List-Post: <mailto:dri-devel@lists.freedesktop.org>
List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help>
List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe>
Cc: linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org,
 Chris Brandt <chris.brandt@renesas.com>,
 Geert Uytterhoeven <geert+renesas@glider.be>, dri-devel@lists.freedesktop.org
MIME-Version: 1.0
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>

Add support for the Okaya RH128128T display to the st7735r driver.

The RH128128T is a 128x128 1.44" TFT display driven by a Sitronix
ST7715R TFT Controller/Driver.  The latter is very similar to the
ST7735R, and can be handled by the existing st7735r driver.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/gpu/drm/tiny/st7735r.c | 65 ++++++++++++++++++++++++++++------
 1 file changed, 55 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/tiny/st7735r.c b/drivers/gpu/drm/tiny/st7735r.c
index 3f4487c716848cf8..05d162e76d8481e5 100644
--- a/drivers/gpu/drm/tiny/st7735r.c
+++ b/drivers/gpu/drm/tiny/st7735r.c
@@ -1,8 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * DRM driver for Sitronix ST7735R panels
+ * DRM driver for Sitronix ST7715R/ST7735R panels
  *
  * Copyright 2017 David Lechner <david@lechnology.com>
+ * Copyright (C) 2019 Glider bvba
  */
 
 #include <linux/backlight.h>
@@ -10,6 +11,7 @@
 #include <linux/dma-buf.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/property.h>
 #include <linux/spi/spi.h>
 #include <video/mipi_display.h>
@@ -37,12 +39,28 @@
 #define ST7735R_MY	BIT(7)
 #define ST7735R_MX	BIT(6)
 #define ST7735R_MV	BIT(5)
+#define ST7735R_RGB	BIT(3)
+
+struct st7735r_cfg {
+	const struct drm_display_mode mode;
+	unsigned int left_offset;
+	unsigned int top_offset;
+	unsigned int write_only:1;
+	unsigned int rgb:1;		/* RGB (vs. BGR) */
+};
+
+struct st7735r_priv {
+	struct mipi_dbi_dev dbidev;	/* Must be first for .release() */
+	unsigned int rgb:1;
+};
 
 static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
 				      struct drm_crtc_state *crtc_state,
 				      struct drm_plane_state *plane_state)
 {
 	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
+	struct st7735r_priv *priv = container_of(dbidev, struct st7735r_priv,
+						 dbidev);
 	struct mipi_dbi *dbi = &dbidev->dbi;
 	int ret, idx;
 	u8 addr_mode;
@@ -87,6 +105,10 @@ static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
 		addr_mode = ST7735R_MY | ST7735R_MV;
 		break;
 	}
+
+	if (priv->rgb)
+		addr_mode |= ST7735R_RGB;
+
 	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
 	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
 			 MIPI_DCS_PIXEL_FMT_16BIT);
@@ -116,8 +138,17 @@ static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = {
 	.prepare_fb	= drm_gem_fb_simple_display_pipe_prepare_fb,
 };
 
-static const struct drm_display_mode jd_t18003_t01_mode = {
-	DRM_SIMPLE_MODE(128, 160, 28, 35),
+static const struct st7735r_cfg jd_t18003_t01_cfg = {
+	.mode		= { DRM_SIMPLE_MODE(128, 160, 28, 35) },
+	/* Cannot read from Adafruit 1.8" display via SPI */
+	.write_only	= true,
+};
+
+static const struct st7735r_cfg rh128128t_cfg = {
+	.mode		= { DRM_SIMPLE_MODE(128, 128, 25, 26) },
+	.left_offset	= 2,
+	.top_offset	= 3,
+	.rgb		= true,
 };
 
 DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
@@ -136,13 +167,14 @@ static struct drm_driver st7735r_driver = {
 };
 
 static const struct of_device_id st7735r_of_match[] = {
-	{ .compatible = "jianda,jd-t18003-t01" },
+	{ .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg },
+	{ .compatible = "okaya,rh128128t", .data = &rh128128t_cfg },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, st7735r_of_match);
 
 static const struct spi_device_id st7735r_id[] = {
-	{ "jd-t18003-t01", 0 },
+	{ "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg },
 	{ },
 };
 MODULE_DEVICE_TABLE(spi, st7735r_id);
@@ -150,17 +182,26 @@ MODULE_DEVICE_TABLE(spi, st7735r_id);
 static int st7735r_probe(struct spi_device *spi)
 {
 	struct device *dev = &spi->dev;
+	const struct st7735r_cfg *cfg;
 	struct mipi_dbi_dev *dbidev;
+	struct st7735r_priv *priv;
 	struct drm_device *drm;
 	struct mipi_dbi *dbi;
 	struct gpio_desc *dc;
 	u32 rotation = 0;
 	int ret;
 
-	dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL);
-	if (!dbidev)
+	cfg = of_device_get_match_data(&spi->dev);
+	if (!cfg)
+		cfg = (void *)spi_get_device_id(spi)->driver_data;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
 		return -ENOMEM;
 
+	dbidev = &priv->dbidev;
+	priv->rgb = cfg->rgb;
+
 	dbi = &dbidev->dbi;
 	drm = &dbidev->drm;
 	ret = devm_drm_dev_init(dev, drm, &st7735r_driver);
@@ -193,10 +234,14 @@ static int st7735r_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	/* Cannot read from Adafruit 1.8" display via SPI */
-	dbi->read_commands = NULL;
+	if (cfg->write_only)
+		dbi->read_commands = NULL;
+
+	dbidev->left_offset = cfg->left_offset;
+	dbidev->top_offset = cfg->top_offset;
 
-	ret = mipi_dbi_dev_init(dbidev, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation);
+	ret = mipi_dbi_dev_init(dbidev, &jd_t18003_t01_pipe_funcs, &cfg->mode,
+				rotation);
 	if (ret)
 		return ret;