* Varadarajan, Charu Latha <charu@xxxxxx> [091210 06:27]: > > > >-----Original Message----- > >From: G, Manjunath Kondaiah > >Sent: Thursday, December 10, 2009 6:49 PM > >To: linux-omap@xxxxxxxxxxxxxxx > >Cc: G, Manjunath Kondaiah; Menon, Nishanth; Sonasath, Moiz; > >Krishnamoorthy, Balaji T; Varadarajan, Charu Latha; George, Harith > >Subject: [PATCH v2] OMAP3 : Fix I2C lockup during timeout/error cases > > > >Current OMAP3 I2C driver code does not follow the correct > >sequence for soft > >reset. Due to this, lock up issues are reported during > >timeout/error cases. > > > >This patch fixes above issue by disabling I2C controller as > >per OMAP3430 TRM > >for soft reset. As per TRM, I2C controller needs to be > >disabled as a first > >step during soft reset. > > > >Here is correct soft reset sequence: > >a. Ensure that the module is disabled > >(clear the I2Ci.I2C_CON[15] I2C_EN bit to 0). > >b. Set the I2Ci.I2C_SYSC[1] SRST bit to 1. > >c. Enable the module by setting I2Ci.I2C_CON[15] I2C_EN bit to 1. > >d. Check the I2Ci.I2C_SYSS[0] RDONE bit until it is set to 1 to > >indicate the software reset is complete. > > > >v1 : Initital version > >v2 : Removed delay since time taken for disabling I2C > >controller is zero > > jiffies > > > >Tested on Zoom2 and Zoom3 > > > >Signed-off-by: Manjunatha GK <manjugk@xxxxxx> > >Signed-off-by: George, Harith<harith@xxxxxx> > > Tested on 3430SDP too. > Acked-by: Charulatha V <charu@xxxxxx> This should be sent via the i2c list and to Ben Books. Regards, Tony -- 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
