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From:   Philip Chen <philipchen@chromium.org>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     swboyd@chromium.org, dianders@chromium.org,
        Philip Chen <philipchen@chromium.org>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@linux.ie>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Robert Foss <robert.foss@linaro.org>,
        dri-devel@lists.freedesktop.org
Subject: [PATCH 1/2] drm/bridge: parade-ps8640: Use regmap APIs
Date:   Wed,  8 Sep 2021 11:18:05 -0700
Message-Id: <20210908111500.1.I9f6dac462da830fa0a8ccccbe977ca918bf14e4a@changeid>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Replace the direct i2c access (i2c_smbus_* functions) with regmap APIs,
which will simplify the future update on ps8640 driver.

Signed-off-by: Philip Chen <philipchen@chromium.org>
---

 drivers/gpu/drm/bridge/parade-ps8640.c | 66 +++++++++++++++-----------
 1 file changed, 39 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index 685e9c38b2db..a16725dbf912 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -9,6 +9,7 @@
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/of_graph.h>
+#include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 
 #include <drm/drm_bridge.h>
@@ -64,12 +65,29 @@ struct ps8640 {
 	struct drm_bridge *panel_bridge;
 	struct mipi_dsi_device *dsi;
 	struct i2c_client *page[MAX_DEVS];
+	struct regmap	*regmap[MAX_DEVS];
 	struct regulator_bulk_data supplies[2];
 	struct gpio_desc *gpio_reset;
 	struct gpio_desc *gpio_powerdown;
 	bool powered;
 };
 
+static const struct regmap_range ps8640_volatile_ranges[] = {
+	{ .range_min = 0, .range_max = 0xff },
+};
+
+static const struct regmap_access_table ps8640_volatile_table = {
+	.yes_ranges = ps8640_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ps8640_volatile_ranges),
+};
+
+static const struct regmap_config ps8640_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.volatile_table = &ps8640_volatile_table,
+	.cache_type = REGCACHE_NONE,
+};
+
 static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
 {
 	return container_of(e, struct ps8640, bridge);
@@ -78,13 +96,13 @@ static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
 static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
 				     const enum ps8640_vdo_control ctrl)
 {
-	struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
-	u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
+	struct regmap *map = ps_bridge->regmap[PAGE3_DSI_CNTL1];
+	u8 vdo_ctrl_buf[] = {VDO_CTL_ADD, ctrl};
 	int ret;
 
-	ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
-					     sizeof(vdo_ctrl_buf),
-					     vdo_ctrl_buf);
+	ret = regmap_bulk_write(map, PAGE3_SET_ADD,
+				vdo_ctrl_buf, sizeof(vdo_ctrl_buf));
+
 	if (ret < 0) {
 		DRM_ERROR("failed to %sable VDO: %d\n",
 			  ctrl == ENABLE ? "en" : "dis", ret);
@@ -96,8 +114,7 @@ static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
 
 static void ps8640_bridge_poweron(struct ps8640 *ps_bridge)
 {
-	struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
-	unsigned long timeout;
+	struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL];
 	int ret, status;
 
 	if (ps_bridge->powered)
@@ -121,18 +138,12 @@ static void ps8640_bridge_poweron(struct ps8640 *ps_bridge)
 	 */
 	msleep(200);
 
-	timeout = jiffies + msecs_to_jiffies(200) + 1;
+	ret = regmap_read_poll_timeout(map, PAGE2_GPIO_H, status,
+			status & PS_GPIO9, 20 * 1000, 200 * 1000);
 
-	while (time_is_after_jiffies(timeout)) {
-		status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
-		if (status < 0) {
-			DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
-			goto err_regulators_disable;
-		}
-		if ((status & PS_GPIO9) == PS_GPIO9)
-			break;
-
-		msleep(20);
+	if (ret < 0) {
+		DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", ret);
+		goto err_regulators_disable;
 	}
 
 	msleep(50);
@@ -144,22 +155,15 @@ static void ps8640_bridge_poweron(struct ps8640 *ps_bridge)
 	 * disabled by the manufacturer. Once disabled, all MCS commands are
 	 * ignored by the display interface.
 	 */
-	status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
-	if (status < 0) {
-		DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
-		goto err_regulators_disable;
-	}
 
-	ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
-					status & ~MCS_EN);
+	ret = regmap_update_bits(map, PAGE2_MCS_EN, MCS_EN, 0);
 	if (ret < 0) {
 		DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
 		goto err_regulators_disable;
 	}
 
 	/* Switch access edp panel's edid through i2c */
-	ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
-					I2C_BYPASS_EN);
+	ret = regmap_write(map, PAGE2_I2C_BYPASS, I2C_BYPASS_EN);
 	if (ret < 0) {
 		DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
 		goto err_regulators_disable;
@@ -361,6 +365,10 @@ static int ps8640_probe(struct i2c_client *client)
 	ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP;
 
 	ps_bridge->page[PAGE0_DP_CNTL] = client;
+	ps_bridge->regmap[PAGE0_DP_CNTL] = devm_regmap_init_i2c(client,
+						&ps8640_regmap_config);
+	if (IS_ERR(ps_bridge->regmap[PAGE0_DP_CNTL]))
+		return PTR_ERR(ps_bridge->regmap[PAGE0_DP_CNTL]);
 
 	for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
 		ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
@@ -371,6 +379,10 @@ static int ps8640_probe(struct i2c_client *client)
 				client->addr + i);
 			return PTR_ERR(ps_bridge->page[i]);
 		}
+		ps_bridge->regmap[i] = devm_regmap_init_i2c(ps_bridge->page[i],
+							&ps8640_regmap_config);
+		if (IS_ERR(ps_bridge->regmap))
+			return PTR_ERR(ps_bridge->regmap[i]);
 	}
 
 	i2c_set_clientdata(client, ps_bridge);
-- 
2.33.0.153.gba50c8fa24-goog