Re: [PATCH] MFD: TWL 6030: clear IRQ status register only once

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Nishan,

On Wed, Feb 22, 2012 at 08:03:45PM -0600, Nishanth Menon wrote:
> TWL6030 family of PMIC use a shadow interrupt status register
> while kernel processes the current interrupt event.
> However, any write(0 or 1) to register INT_STS_A, INT_STS_B or
> INT_STS_C clears all 3 interrupt status registers.
> 
> Since clear of the interrupt is done on 32k clk, depending on I2C
> bus speed, we could in-adverently clear the status of a interrupt
> status pending on shadow register in the current implementation.
> This is due to the fact that multi-byte i2c write operation into
> three seperate status register could result in multiple load
> and clear of status and result in lost interrupts.
> 
> Instead, doing a single byte write to INT_STS_A register with 0x0
> will clear all three interrupt status registers without the related
> risk.
Applied, thanks.

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux