diff mbox series

[1/3] af9035: Better explain how i2c bus speed is computed.

Message ID 20191003124532.10945-2-gonsolo@gmail.com (mailing list archive)
State New, archived
Headers show
Series [1/3] af9035: Better explain how i2c bus speed is computed. | expand

Commit Message

Gon Solo Oct. 3, 2019, 12:45 p.m. UTC 
Original patch from Mauro Carvalho Chehab.

Signed-off-by: Gon Solo <gonsolo@gmail.com>
---
 drivers/media/usb/dvb-usb-v2/af9035.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c
index 3afd18733614..7828f8567da0 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -1197,6 +1197,9 @@  static int af9035_frontend_attach(struct dvb_usb_adapter *adap)
 	return ret;
 }
 
+/* I2C speed register = (1000000000 / (24.4 * 16 * I2C_speed)) */
+#define I2C_SPEED_REGISTER 7
+
 static int it930x_frontend_attach(struct dvb_usb_adapter *adap)
 {
 	struct state *state = adap_to_priv(adap);
@@ -1208,13 +1211,13 @@  static int it930x_frontend_attach(struct dvb_usb_adapter *adap)
 
 	dev_dbg(&intf->dev, "adap->id=%d\n", adap->id);
 
-	/* I2C master bus 2 clock speed 300k */
-	ret = af9035_wr_reg(d, 0x00f6a7, 0x07);
+	/* I2C master bus 2 clock speed ~300k */
+	ret = af9035_wr_reg(d, 0x00f6a7, I2C_SPEED_REGISTER);
 	if (ret < 0)
 		goto err;
 
-	/* I2C master bus 1,3 clock speed 300k */
-	ret = af9035_wr_reg(d, 0x00f103, 0x07);
+	/* I2C master bus 1,3 clock speed ~300k */
+	ret = af9035_wr_reg(d, 0x00f103, I2C_SPEED_REGISTER);
 	if (ret < 0)
 		goto err;