diff options
| author | Roshni Shah <roshni.shah@timesys.com> | 2014-01-05 16:15:28 -0500 |
|---|---|---|
| committer | Roshni Shah <roshni.shah@timesys.com> | 2014-01-05 16:34:28 -0500 |
| commit | 5e74d2d05b5543eb7952806e80842a4645e7685a (patch) | |
| tree | dd41d3876a0ee7aa035c5a5d4f05a60fab78379c /drivers | |
| parent | 81d90159c6aa14b6c713a1280d19a7ba6f8b9e0c (diff) | |
Quartz: Fixed Linux-MQX semaphore conflict in the i2c driver for multiple i2c
registrations in Linux.
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/busses/i2c-imx.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index e13e020cab2e..8cd88b24a47c 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -59,6 +59,8 @@ /* This will be the driver name the kernel reports */ #define DRIVER_NAME "imx-i2c" +#define FALSE 0 +#define TRUE 1 /* Default value */ #define IMX_I2C_BIT_RATE 100000 /* 100kHz */ @@ -521,6 +523,7 @@ static int __init i2c_imx_probe(struct platform_device *pdev) resource_size_t res_size; int irq; int ret; + static bool sema4Assigned = FALSE; dev_dbg(&pdev->dev, "<%s>\n", __func__); @@ -620,10 +623,14 @@ static int __init i2c_imx_probe(struct platform_device *pdev) platform_set_drvdata(pdev, i2c_imx); #ifdef CONFIG_ARCH_MVF - // for makeing sure not in use by MQX concurrently - if(mvf_sema4_assign(MVF_I2C_SEMAPHORE_NUMBER, &sema4)) { - dev_err(&pdev->dev, "could not assign MQX semaphore %d\n", MVF_I2C_SEMAPHORE_NUMBER); - goto fail5; + if(sema4Assigned == FALSE) + { + // for making sure the i2c port is not in use by MQX concurrently + if(mvf_sema4_assign(MVF_I2C_SEMAPHORE_NUMBER, &sema4)) { + dev_err(&pdev->dev, "could not assign MQX semaphore %d\n", MVF_I2C_SEMAPHORE_NUMBER); + goto fail5; + } + sema4Assigned = TRUE; } #endif |