From: Nishanth Menon Date: Thu, 23 Feb 2012 02:03:45 +0000 (-0600) Subject: mfd: Clear twl6030 IRQ status register only once X-Git-Tag: v3.2.15~7 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5071aa97c540286cb979b64aebf4ca142f858529;p=pandora-kernel.git mfd: Clear twl6030 IRQ status register only once commit 3f8349e6e98ba0455437724589072523865eae5e upstream. 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. Acked-by: Santosh Shilimkar Signed-off-by: Nishanth Menon Signed-off-by: Samuel Ortiz Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed