From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754308AbcH2Qg7 (ORCPT ); Mon, 29 Aug 2016 12:36:59 -0400 Received: from nat-hk.nvidia.com ([203.18.50.4]:28982 "EHLO hkmmgate102.nvidia.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752068AbcH2Qg5 (ORCPT ); Mon, 29 Aug 2016 12:36:57 -0400 X-PGP-Universal: processed; by hkpgpgate102.nvidia.com on Mon, 29 Aug 2016 09:36:52 -0700 From: Shardar Shariff Md To: , , , , , , , , Subject: [PATCH v9 1/4] i2c: tegra: use readl_poll_timeout after config_load reg programmed Date: Mon, 29 Aug 2016 22:06:36 +0530 Message-ID: <1472488599-13562-1-git-send-email-smohammed@nvidia.com> X-Mailer: git-send-email 1.8.1.5 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 After CONFIG_LOAD register is programmed instead of explicitly waiting for timeout, use readx_poll_timeout() to check for register value to get updated or wait till 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 Changes in v8: - 1st change of [PATCH v7] series is merged, v8 is rebased on top of merged change, here patch series is changed accordingly. - Updated the commit message as per review to properly reflect change. - calculate the register offset seperately to make code more readable. Changes in v9: - Use readl_poll_timeout() instead of readx_poll_timeout() --- --- drivers/i2c/busses/i2c-tegra.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index d9979da..41ffc8a 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 +480,19 @@ 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) { + unsigned long reg_offset; + void __iomem *addr; + u32 val; + + reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_CONFIG_LOAD); + addr = i2c_dev->base + reg_offset; 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 = readl_poll_timeout(addr, 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