linux-kernel - [PATCH 4/5] i2c: tegra: use atomic poll function during configuration

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Message-ID: <1472649758-5608-4-git-send-email-smohammed@nvidia.com>
Date:   Wed, 31 Aug 2016 18:52:37 +0530
From:   Shardar Shariff Md <smohammed@...dia.com>
To:     <smohammed@...dia.com>, <wsa@...-dreams.de>,
        <swarren@...dotorg.org>, <thierry.reding@...il.com>,
        <gnurou@...il.com>, <linux-i2c@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <jonathanh@...dia.com>
Subject: [PATCH 4/5] i2c: tegra: use atomic poll function during configuration

Use readl_poll_timeout_atomic() function as *wait_for_config_load()
function can be called from interrupt context.

Signed-off-by: Shardar Shariff Md <smohammed@...dia.com>

---
Changes in v10:
- Rebase on top of [PATCH V2 0/9] Some Tegra I2C Updates

Changes in v11:
- Fix checkpatch error of using in_atomic() API
---
---
 drivers/i2c/busses/i2c-tegra.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index daab0ce..2437535 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -457,8 +457,13 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
 		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);
-		err = readl_poll_timeout(addr, val, val == 0, 1000,
-					 I2C_CONFIG_LOAD_TIMEOUT);
+		if (in_interrupt())
+			err = readl_poll_timeout_atomic(addr, val, val == 0,
+					1000, I2C_CONFIG_LOAD_TIMEOUT);
+		else
+			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");
-- 
1.8.1.5