Hi Sylwester, 2011-03-20 오전 4:28, Sylwester Nawrocki 쓴 글: > On 03/19/2011 04:11 PM, Kim HeungJun wrote: >> Hi Sylwester, >> >> Thanks for the reviews. :) >> >> 2011. 3. 19., 오후 10:37, Sylwester Nawrocki 작성: >> >>> Hi HeungJun, >>> >>> On 03/16/2011 02:38 PM, Kim, Heungjun wrote: >>>> Add I2C/V4L2 subdev driver for M-5MOLS camera sensor with integrated >>>> image signal processor. >>>> [snip] >>>> >>>> 3. Speed-up whole I2C operation >>>> : I've tested several times for decreasing the stabilization time >>>> while I2C communication, and I have find proper time. Of course, >>>> it's more faster than previous version. >>> >>> That sounds good. Do you think the delays before I2C read/write could >>> be avoided in some (if not all) cases by using some status registers >>> polling? >> I don't understand literally. Could you explain more detailed with some >> examples? >> My understanding is that it might be an issues or problem when getting some >> status registers with polling it. is it right? > > My concern is that we might not need an extra delay between consecutive > read or write operations in every case. Possibly it would be enough > to read the status of some operations instead. But that just what I suspect. Ah, I understand. The consecutive delay needs to read/write operations. Because, in non-delay cases, I found the values is not changed to be read when the driver is reading continuously at the different address. I means, if there is not regular amount of delay in r/w operations, the value is kept the previous value to be read by I2C operation. It's the same way in writing case. It's wierd.
It might be different the kind of M-5MOLS sensor's FW and packaging type. But, I expect that the internal ARM core of M-5MOLS takes time to proceed something and to load values through I2C bus for the host process. Regards, Heungjun Kim -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
