Hello Maxime, thank you for your feedback.
> > > +/* > > > + * configure parallel port control lines polarity > > > + * > > > + * POLARITY CTRL0 > > > + * - [5]:PCLK polarity (0: active low, 1: active high) > > > + * - [1]:HREF polarity (0: active low, 1: active high) > > > + * - [0]:VSYNC polarity (mismatch here between > > > + *datasheet and hardware, 0 is active high > > > + *and 1 is active low...) > > > > I know that yourself and Maxime have both confirmed that VSYNC > > polarity is inverted, but I am looking at HSYNC and VSYNC with a > > logic analyser and I am dumping the values written to > > OV5640_REG_POLARITY_CTRL00 and to me it looks like that HSYNC is > > active HIGH when hsync_pol == 0, and VSYNC is active HIGH when > > vsync_pol == 1. > > Which mode are you testing this on? My testing environment is made of the sensor connected to a SoC with 8 data lines, vsync, hsync, and pclk, and of course I am specifying hsync-active, vsync-active, and pclk-sample in the device tree on both ends so that they configure themselves accordingly to work in DVP mode (V4L2_MBUS_PARALLEL), with the correct polarities. Between the sensor and the SoC there is a noninverting bus transceiver (voltage translator), for my experiments I have plugged myself onto the outputs of this transceiver only to be compliant with the voltage level of my logic analyser. > > The non-active periods are insanely high in most modes (1896 for an > active horizontal length of 640 in 640x480 for example), especially > hsync, and it's really easy to invert the two. I am looking at all the data lines, so that I don't confuse the non-active periods with the active periods, and with my setup what I reported is what I get. I wonder if this difference comes from the sensor revision at all? Unfortunately I can only test the one camera I have got. Thanks, Fab > > Maxime > > -- > Maxime Ripard, Bootlin (formerly Free Electrons) > Embedded Linux and Kernel engineering > http://bootlin.com Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.
