From patchwork Mon Apr 25 11:57:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shardar Shariff Md X-Patchwork-Id: 614411 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3qtl9D6P0Sz9t5X for ; Mon, 25 Apr 2016 21:58:08 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754645AbcDYL6C (ORCPT ); Mon, 25 Apr 2016 07:58:02 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:11235 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754531AbcDYL6B (ORCPT ); Mon, 25 Apr 2016 07:58:01 -0400 Received: from hqnvupgp07.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com id ; Mon, 25 Apr 2016 04:58:00 -0700 Received: from HQMAIL108.nvidia.com ([172.20.12.94]) by hqnvupgp07.nvidia.com (PGP Universal service); Mon, 25 Apr 2016 04:57:36 -0700 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Mon, 25 Apr 2016 04:57:36 -0700 Received: from BGMAIL104.nvidia.com (10.25.59.13) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1130.7; Mon, 25 Apr 2016 11:57:59 +0000 Received: from HQMAIL103.nvidia.com (172.20.187.11) by bgmail104.nvidia.com (10.25.59.13) with Microsoft SMTP Server (TLS) id 15.0.1130.7; Mon, 25 Apr 2016 11:57:55 +0000 Received: from shardar-build-machine.nvidia.com (172.20.13.39) by HQMAIL103.nvidia.com (172.20.187.11) with Microsoft SMTP Server (TLS) id 15.0.1130.7 via Frontend Transport; Mon, 25 Apr 2016 11:57:50 +0000 From: Shardar Shariff Md To: , , , , , , , , CC: Shardar Shariff Md Subject: [PATCH v6 2/4] i2c: tegra: calculate timeout for config load when needed Date: Mon, 25 Apr 2016 17:27:36 +0530 Message-ID: <1461585458-23948-2-git-send-email-smohammed@nvidia.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1461585458-23948-1-git-send-email-smohammed@nvidia.com> References: <1461585458-23948-1-git-send-email-smohammed@nvidia.com> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Instead of calculating timeout for the config load during init, calculate it after config load register is written by using readx_poll_timeout(). Signed-off-by: Shardar Shariff Md --- Changes in v4: - Split timeout calculation to separate patch Changes in v5: - Move disabling of clock to separate patch --- drivers/i2c/busses/i2c-tegra.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 445398c3..c1b02c7 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -28,6 +28,7 @@ #include #include #include +#include #include @@ -110,6 +111,8 @@ #define I2C_CLKEN_OVERRIDE 0x090 #define I2C_MST_CORE_CLKEN_OVR (1 << 0) +#define I2C_CONFIG_LOAD_TIMEOUT 1000000 + /* * msg_end_type: The bus control which need to be send at end of transfer. * @MSG_END_STOP: Send stop pulse at end of transfer. @@ -428,7 +431,6 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) u32 val; int err = 0; u32 clk_divisor; - unsigned long timeout = jiffies + HZ; err = tegra_i2c_clock_enable(i2c_dev); if (err < 0) { @@ -478,15 +480,17 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE); if (i2c_dev->hw->has_config_load_reg) { + u32 val; + i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD); - while (i2c_readl(i2c_dev, I2C_CONFIG_LOAD) != 0) { - if (time_after(jiffies, timeout)) { - dev_warn(i2c_dev->dev, - "timeout waiting for config load\n"); - err = -ETIMEDOUT; - goto err; - } - msleep(1); + err = readx_poll_timeout(readl, i2c_dev->base + + tegra_i2c_reg_addr(i2c_dev, + I2C_CONFIG_LOAD), val, val == 0, + 1000, I2C_CONFIG_LOAD_TIMEOUT); + if (err) { + dev_warn(i2c_dev->dev, + "timeout waiting for config load\n"); + goto err; } }