diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2014-12-16 12:25:38 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-12-16 12:25:38 +0100 |
| commit | 8ab7913675726e5ae23b91221c0b5442d986d44a (patch) | |
| tree | f2673dcb25e864cc87abe3f2d58db9bf9730f148 /drivers/i2c/busses/i2c-cadence.c | |
| parent | 864b94adfcba752aa902ee34497bbe58b97aa8d3 (diff) | |
| parent | 3a5dc1fafb016560315fe45bb4ef8bde259dd1bc (diff) | |
Merge branch 'x86/vt-d' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu into x86/apic-picks
Required to apply Jiangs x86 irq handling rework without creating a
nightmare of conflicts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-cadence.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-cadence.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c index 63f3f03ecc9b..c604f4c3ac0d 100644 --- a/drivers/i2c/busses/i2c-cadence.c +++ b/drivers/i2c/busses/i2c-cadence.c @@ -111,6 +111,8 @@ #define CDNS_I2C_DIVA_MAX 4 #define CDNS_I2C_DIVB_MAX 64 +#define CDNS_I2C_TIMEOUT_MAX 0xFF + #define cdns_i2c_readreg(offset) readl_relaxed(id->membase + offset) #define cdns_i2c_writereg(val, offset) writel_relaxed(val, id->membase + offset) @@ -852,6 +854,15 @@ static int cdns_i2c_probe(struct platform_device *pdev) goto err_clk_dis; } + /* + * Cadence I2C controller has a bug wherein it generates + * invalid read transaction after HW timeout in master receiver mode. + * HW timeout is not used by this driver and the interrupt is disabled. + * But the feature itself cannot be disabled. Hence maximum value + * is written to this register to reduce the chances of error. + */ + cdns_i2c_writereg(CDNS_I2C_TIMEOUT_MAX, CDNS_I2C_TIME_OUT_OFFSET); + dev_info(&pdev->dev, "%u kHz mmio %08lx irq %d\n", id->i2c_clk / 1000, (unsigned long)r_mem->start, id->irq); |