From 7aebec709ea87dafb9776895c4c2626a659e043c Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Thu, 23 Apr 2020 10:17:18 +0100 Subject: [PATCH] drm/panel/raspberrypi-touchscreen: Use independent I2C actions with delay. We now have the hardware I2C controller pinmuxed to the drive the display I2C, but this controller does not support clock stretching. The Atmel micro-controller in the panel requires clock stretching to allow it to prepare any data to be read. Split the rpi_touchscreen_i2c_read into two independent transactions with a delay between them for the Atmel to prepare the data. Signed-off-by: Dave Stevenson --- .../drm/panel/panel-raspberrypi-touchscreen.c | 30 ++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c +++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c @@ -220,7 +220,35 @@ static struct rpi_touchscreen *panel_to_ static int rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg) { - return i2c_smbus_read_byte_data(ts->i2c, reg); + struct i2c_client *client = ts->i2c; + struct i2c_msg msgs[1]; + u8 addr_buf[1] = { reg }; + u8 data_buf[1] = { 0, }; + int ret; + + /* Write register address */ + msgs[0].addr = client->addr; + msgs[0].flags = 0; + msgs[0].len = ARRAY_SIZE(addr_buf); + msgs[0].buf = addr_buf; + + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (ret != ARRAY_SIZE(msgs)) + return -EIO; + + usleep_range(100, 300); + + /* Read data from register */ + msgs[0].addr = client->addr; + msgs[0].flags = I2C_M_RD; + msgs[0].len = 1; + msgs[0].buf = data_buf; + + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (ret != ARRAY_SIZE(msgs)) + return -EIO; + + return data_buf[0]; } static void rpi_touchscreen_i2c_write(struct rpi_touchscreen *ts,