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From: Gon Solo <gonsolo@gmail.com>
To: mchehab+samsung@kernel.org
Cc: linux-media@vger.kernel.org, mchehab@infradead.org, jp@jpvw.nl,
	crope@iki.fi, sean@mess.org, linux-kernel@vger.kernel.org,
	Gon Solo <gonsolo@gmail.com>
Subject: [PATCH 3/4] af9035: Make speed computation clear.
Date: Thu, 10 Oct 2019 11:51:02 +0200	[thread overview]
Message-ID: <20191010095103.3803-4-gonsolo@gmail.com> (raw)
In-Reply-To: <20191010091848.GA2898@Limone>

Signed-off-by: Gon Solo <gonsolo@gmail.com>
---
 drivers/media/usb/dvb-usb-v2/af9035.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c
index 3afd18733614..51e607ea3add 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -1197,6 +1197,15 @@ static int af9035_frontend_attach(struct dvb_usb_adapter *adap)
 	return ret;
 }
 
+/*
+ * The I2C speed register is calculated with:
+ *	I2C speed register = (1000000000 / (24.4 * 16 * I2C_speed))
+ *
+ * The default speed register for it930x is 7, with means a
+ * speed of ~366 kbps
+ */
+#define I2C_SPEED_366K 7
+
 static int it930x_frontend_attach(struct dvb_usb_adapter *adap)
 {
 	struct state *state = adap_to_priv(adap);
@@ -1208,13 +1217,13 @@ 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 366k */
+	ret = af9035_wr_reg(d, 0x00f6a7, I2C_SPEED_366K);
 	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 366k */
+	ret = af9035_wr_reg(d, 0x00f103, I2C_SPEED_366K);
 	if (ret < 0)
 		goto err;
 
-- 
2.20.1


  parent reply	other threads:[~2019-10-10  9:51 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-30 10:32 DVB-T2 Stick Gonsolo
2019-02-19 21:30 ` Sean Young
2019-10-01 22:19   ` Gonsolo
2019-10-01 23:52     ` Mauro Carvalho Chehab
2019-10-02 14:13       ` [PATCH] si2157: Add support for Logilink VG0022A Gon Solo
2019-10-02 14:13         ` Gon Solo
2019-10-02 14:27           ` Sean Young
2019-10-02 14:44             ` Gonsolo
2019-10-02 15:06               ` Sean Young
2019-10-02 15:21                 ` Gonsolo
2019-10-02 17:23                   ` JP
2019-10-02 18:49                     ` Mauro Carvalho Chehab
2019-10-03  8:06                       ` [PATCH 0/1] Testing timing patch " Gon Solo
2019-10-03  8:06                       ` [PATCH 1/1] Test Mauros timing patch Gon Solo
2019-10-03 10:13                       ` [PATCH] si2157: Add support for Logilink VG0022A Gonsolo
2019-10-03 10:57                         ` Gonsolo
2019-10-03 11:17                           ` Mauro Carvalho Chehab
2019-10-03 11:41                             ` Gonsolo
2019-10-03 12:49                               ` Mauro Carvalho Chehab
2019-10-03 12:52                                 ` Mauro Carvalho Chehab
2019-10-03 13:02                                   ` Gon Solo
2019-10-03 13:53                                     ` Gonsolo
2019-10-03 14:05                                       ` Mauro Carvalho Chehab
2019-10-03 14:29                                         ` Gonsolo
2019-10-03 12:01                             ` Gon Solo
2019-10-03 12:12                               ` Mauro Carvalho Chehab
2019-10-03 12:20                                 ` Gon Solo
2019-10-03 12:45                                   ` [PATCH 0/3] " Gon Solo
2019-10-03 12:45                                   ` [PATCH 1/3] [PATCH] af9035: Better explain how i2c bus speed is computed Gon Solo
2019-10-03 12:45                                   ` [PATCH 2/3] [PATCH] s2157: Handle bogus chip version Gon Solo
2019-10-03 12:45                                   ` [PATCH 3/3] [PATCH] af9035: Add Logilink VG0022A id Gon Solo
2019-10-03 11:05                         ` [PATCH] si2157: Add support for Logilink VG0022A Mauro Carvalho Chehab
2019-10-03 15:00                           ` Gonsolo
2019-10-03 15:02                             ` Mauro Carvalho Chehab
2019-10-03 15:17                               ` Gonsolo
2019-10-03 16:03                               ` Gon Solo
2019-10-03 16:09                                 ` Mauro Carvalho Chehab
2019-10-03 16:23                                   ` Gon Solo
2019-10-03 17:42                                     ` Mauro Carvalho Chehab
2019-10-03 17:49                                       ` Gonsolo
2019-10-03 18:32                                       ` Gon Solo
2019-10-03 18:42                                         ` JP
2019-10-03 18:50                                           ` Gonsolo
2019-10-03 18:53                                             ` Gonsolo
2019-10-03 19:19                                           ` Gonsolo
2019-10-03 19:39                                             ` Mauro Carvalho Chehab
2019-10-03 19:44                                               ` Mauro Carvalho Chehab
2019-10-03 19:51                                                 ` Gonsolo
2019-10-03 20:03                                                   ` Mauro Carvalho Chehab
2019-10-03 20:32                                                     ` Gonsolo
2019-10-04 11:50                                                     ` JP
2019-10-04 12:08                                                       ` Mauro Carvalho Chehab
2019-10-04 13:15                                                         ` [PATCH 1/4] media: si2168: use bits instead of bool for flags Mauro Carvalho Chehab
2019-10-04 13:15                                                           ` [PATCH 2/4] media: si2168: add support for not loading a firmware Mauro Carvalho Chehab
2019-10-04 13:15                                                           ` [PATCH 3/4] media: af9035: add support for Logilink VG0022A Mauro Carvalho Chehab
2019-10-09 21:44                                                             ` Gon Solo
2019-10-09 22:04                                                               ` Gon Solo
2019-10-10  8:23                                                                 ` Gon Solo
2019-10-10  9:18                                                                 ` Gon Solo
2019-10-10  9:50                                                                   ` [PATCH 0/4] Add " Gon Solo
2019-10-10 10:10                                                                     ` Mauro Carvalho Chehab
2019-10-10  9:51                                                                   ` [PATCH 1/4] si2168: Use bits and convert to kernel-doc format Gon Solo
2019-10-10  9:51                                                                   ` [PATCH 2/4] si2157: Add option for not downloading firmware Gon Solo
2019-10-10  9:51                                                                   ` Gon Solo [this message]
2019-10-10  9:51                                                                   ` [PATCH 4/4] Add support for Logilink VG0022A Gon Solo
2019-10-10 11:44                                                                     ` Gon Solo
2019-11-15 18:06                                                                       ` Gon Solo
2019-10-04 13:15                                                           ` [PATCH 4/4] media: af9035: add the formula used for the I2C speed Mauro Carvalho Chehab
2019-10-10 10:55                                                           ` [PATCH 1/4] media: si2168: use bits instead of bool for flags Gon Solo
2019-10-10 11:34                                                             ` Mauro Carvalho Chehab
2019-10-10 11:42                                                               ` Mauro Carvalho Chehab
2019-10-04 13:50                                                         ` [PATCH] si2157: Add support for Logilink VG0022A JP
2019-10-04 14:16                                                           ` Mauro Carvalho Chehab
2019-10-03 19:40                                             ` Gonsolo
2019-10-03 19:52                                               ` Mauro Carvalho Chehab
2019-10-03 19:57                                                 ` Gonsolo
2019-10-02 15:00           ` Mauro Carvalho Chehab

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