From patchwork Fri Jan 27 20:54:39 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antti Palosaari X-Patchwork-Id: 9542639 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AA656601D7 for ; Fri, 27 Jan 2017 20:55:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9C4A926E98 for ; Fri, 27 Jan 2017 20:55:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9121D2831C; Fri, 27 Jan 2017 20:55:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 36A3326E98 for ; Fri, 27 Jan 2017 20:55:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751373AbdA0UzK (ORCPT ); Fri, 27 Jan 2017 15:55:10 -0500 Received: from mail.kapsi.fi ([217.30.184.167]:47244 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751357AbdA0UzH (ORCPT ); Fri, 27 Jan 2017 15:55:07 -0500 Received: from [82.128.187.92] (helo=c-46-246-87-105.ip4.frootvpn.com) by mail.kapsi.fi with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1cXDY1-00051n-VY; Fri, 27 Jan 2017 22:55:06 +0200 From: Antti Palosaari To: linux-media@vger.kernel.org Cc: Antti Palosaari Subject: [PATCH v3 2/7] mt2060: add param to split long i2c writes Date: Fri, 27 Jan 2017 22:54:39 +0200 Message-Id: <20170127205444.3242-2-crope@iki.fi> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170127205444.3242-1-crope@iki.fi> References: <20170127205444.3242-1-crope@iki.fi> X-SA-Exim-Connect-IP: 82.128.187.92 X-SA-Exim-Mail-From: crope@iki.fi X-SA-Exim-Scanned: No (on mail.kapsi.fi); SAEximRunCond expanded to false Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add configuration parameter to split long i2c writes as some I2C adapters cannot write 10 bytes used as a one go. Signed-off-by: Antti Palosaari --- drivers/media/tuners/mt2060.c | 21 +++++++++++++++++---- drivers/media/tuners/mt2060.h | 3 +++ drivers/media/tuners/mt2060_priv.h | 1 + 3 files changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/media/tuners/mt2060.c b/drivers/media/tuners/mt2060.c index dc4f9a9..9775ded 100644 --- a/drivers/media/tuners/mt2060.c +++ b/drivers/media/tuners/mt2060.c @@ -71,13 +71,24 @@ static int mt2060_writereg(struct mt2060_priv *priv, u8 reg, u8 val) // Writes a set of consecutive registers static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len) { + int rem, val_len; + u8 xfer_buf[16]; struct i2c_msg msg = { - .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len + .addr = priv->cfg->i2c_address, .flags = 0, .buf = xfer_buf }; - if (i2c_transfer(priv->i2c, &msg, 1) != 1) { - printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n",(int)len); - return -EREMOTEIO; + + for (rem = len - 1; rem > 0; rem -= priv->i2c_max_regs) { + val_len = min_t(int, rem, priv->i2c_max_regs); + msg.len = 1 + val_len; + xfer_buf[0] = buf[0] + len - 1 - rem; + memcpy(&xfer_buf[1], &buf[1 + len - 1 - rem], val_len); + + if (i2c_transfer(priv->i2c, &msg, 1) != 1) { + printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n", val_len); + return -EREMOTEIO; + } } + return 0; } @@ -369,6 +380,7 @@ struct dvb_frontend * mt2060_attach(struct dvb_frontend *fe, struct i2c_adapter priv->cfg = cfg; priv->i2c = i2c; priv->if1_freq = if1; + priv->i2c_max_regs = ~0; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */ @@ -426,6 +438,7 @@ static int mt2060_probe(struct i2c_client *client, dev->i2c = client->adapter; dev->if1_freq = pdata->if1 ? pdata->if1 : 1220; dev->client = client; + dev->i2c_max_regs = pdata->i2c_write_max ? pdata->i2c_write_max - 1 : ~0; ret = mt2060_readreg(dev, REG_PART_REV, &chip_id); if (ret) { diff --git a/drivers/media/tuners/mt2060.h b/drivers/media/tuners/mt2060.h index 05c0d55..f0572ac 100644 --- a/drivers/media/tuners/mt2060.h +++ b/drivers/media/tuners/mt2060.h @@ -34,12 +34,15 @@ struct i2c_adapter; * struct mt2060_platform_data - Platform data for the mt2060 driver * @clock_out: Clock output setting. 0 = off, 1 = CLK/4, 2 = CLK/2, 3 = CLK/1. * @if1: First IF used [MHz]. 0 defaults to 1220. + * @i2c_write_max: Maximum number of bytes I2C adapter can write at once. + * 0 defaults to maximum. * @dvb_frontend: DVB frontend. */ struct mt2060_platform_data { u8 clock_out; u16 if1; + unsigned int i2c_write_max:5; struct dvb_frontend *dvb_frontend; }; diff --git a/drivers/media/tuners/mt2060_priv.h b/drivers/media/tuners/mt2060_priv.h index dfc4a06..f0fdb83 100644 --- a/drivers/media/tuners/mt2060_priv.h +++ b/drivers/media/tuners/mt2060_priv.h @@ -98,6 +98,7 @@ struct mt2060_priv { struct i2c_client *client; struct mt2060_config config; + u8 i2c_max_regs; u32 frequency; u16 if1_freq; u8 fmfreq;