Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753489AbdGMPoC (ORCPT ); Thu, 13 Jul 2017 11:44:02 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:38656 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753436AbdGMPoA (ORCPT ); Thu, 13 Jul 2017 11:44:00 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Maciej S. Szmigiero" , Mauro Carvalho Chehab , Oliver Hartkopp Subject: [PATCH 3.18 22/22] [media] saa7134: fix warm Medion 7134 EEPROM read Date: Thu, 13 Jul 2017 17:43:02 +0200 Message-Id: <20170713153935.032162351@linuxfoundation.org> X-Mailer: git-send-email 2.13.2 In-Reply-To: <20170713153934.089183081@linuxfoundation.org> References: <20170713153934.089183081@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2345 Lines: 73 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maciej S. Szmigiero commit 5a91206ff0d0548939f3e85a65fb76b400fb0e89 upstream. When saa7134 module driving a Medion 7134 card is reloaded reads of this card EEPROM (required for automatic detection of tuner model) will be corrupted due to I2C gate in DVB-T demod being left closed. This sometimes also happens on first saa7134 module load after a warm reboot. Fix this by opening this I2C gate before doing EEPROM read during i2c initialization. Signed-off-by: Maciej S. Szmigiero Signed-off-by: Mauro Carvalho Chehab Cc: Oliver Hartkopp Signed-off-by: Greg Kroah-Hartman --- drivers/media/pci/saa7134/saa7134-i2c.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) --- a/drivers/media/pci/saa7134/saa7134-i2c.c +++ b/drivers/media/pci/saa7134/saa7134-i2c.c @@ -350,12 +350,43 @@ static struct i2c_client saa7134_client_ /* ----------------------------------------------------------- */ +/* On Medion 7134 reading EEPROM needs DVB-T demod i2c gate open */ +static void saa7134_i2c_eeprom_md7134_gate(struct saa7134_dev *dev) +{ + u8 subaddr = 0x7, dmdregval; + u8 data[2]; + int ret; + struct i2c_msg i2cgatemsg_r[] = { {.addr = 0x08, .flags = 0, + .buf = &subaddr, .len = 1}, + {.addr = 0x08, + .flags = I2C_M_RD, + .buf = &dmdregval, .len = 1} + }; + struct i2c_msg i2cgatemsg_w[] = { {.addr = 0x08, .flags = 0, + .buf = data, .len = 2} }; + + ret = i2c_transfer(&dev->i2c_adap, i2cgatemsg_r, 2); + if ((ret == 2) && (dmdregval & 0x2)) { + pr_debug("%s: DVB-T demod i2c gate was left closed\n", + dev->name); + + data[0] = subaddr; + data[1] = (dmdregval & ~0x2); + if (i2c_transfer(&dev->i2c_adap, i2cgatemsg_w, 1) != 1) + pr_err("%s: EEPROM i2c gate open failure\n", + dev->name); + } +} + static int saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len) { unsigned char buf; int i,err; + if (dev->board == SAA7134_BOARD_MD7134) + saa7134_i2c_eeprom_md7134_gate(dev); + dev->i2c_client.addr = 0xa0 >> 1; buf = 0; if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {