Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932704AbcDYNjY (ORCPT ); Mon, 25 Apr 2016 09:39:24 -0400 Received: from nat-hk.nvidia.com ([203.18.50.4]:53558 "EHLO hkmmgate102.nvidia.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932231AbcDYNjW (ORCPT ); Mon, 25 Apr 2016 09:39:22 -0400 X-PGP-Universal: processed; by hkpgpgate101.nvidia.com on Mon, 25 Apr 2016 06:39:13 -0700 From: Shardar Shariff Md To: , , , , , , , , CC: Shardar Shariff Md Subject: [PATCH v7 2/4] i2c: tegra: calculate timeout for config load when needed Date: Mon, 25 Apr 2016 19:08:37 +0530 Message-ID: <1461591519-24602-2-git-send-email-smohammed@nvidia.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1461591519-24602-1-git-send-email-smohammed@nvidia.com> References: <1461591519-24602-1-git-send-email-smohammed@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2070 Lines: 73 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; } } -- 1.8.1.5