Hi Sascha, On Tue, 2015-03-31 at 19:52 +0200, Sascha Hauer wrote: > On Tue, Mar 31, 2015 at 07:50:58PM +0800, Eddie Huang wrote: > > Hi Sascha, > > > > On Tue, 2015-03-31 at 15:08 +0800, Eddie Huang wrote: > > > Hi Sascha, > > > > > > > > > speed <= 400000 here to make this more obvious? > > > > > There are two cases, not only speed<=400000, but I2C_MASTER_WRRD. I tend > > > > > to keep it. > > > > > > > > Still it looks strange. You only ever write this default value to the > > > > register. Putting this register write under an if() seems bogus since > > > > the same value will be in the register the next time this code is > > > > executed. It looks like you should move this register write to some > > > > initialization function. > > > OK, move to mtk_i2c_init_hw function > > > > > Sorry for my negligence. Write-then-read (I2C_MASTER_WRRD) decides > > according to each I2C transfer, so I still need to judge whether set > > I2C_CONTROL_RS and DELAY_LEN here. Other control setting can move to > > init function. > > You need to decide whether you have to set the I2C_CONTROL_RS bit, but > you don't need to write the same value to the DELAY_LEN register each > time. It won't change under your hood. > Yes, you are right. DELAY_LEN should only be set one time in init function. Thanks your correction. Eddie -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
