On Sunday 16 November 2014 12:57 AM, Richard Cochran wrote: > On Fri, Nov 14, 2014 at 10:37:27AM +0530, Vignesh R wrote: >> From: Brad Griffis <bgriffis@xxxxxx> >> >> TSC interrupt handler had udelay to avoid reporting of false pen-up >> interrupt to user space. This patch implements workaround suggesting in >> Advisory 1.0.31 of silicon errata for am335x, thus eliminating udelay >> and touchscreen lag. This also improves performance of touchscreen and >> eliminates sudden jump of cursor at touch release. > > I back ported this series onto v3.15.1 in order to try this out on a > custom, beaglebone-like board. With this series, the touch is really > broken. (I had fixed the pen up problem in a totally different way for > a customer, and so I wanted to try out your solution.) > > I will try to port the board code to a more recent kernel to try your > series again. With which kernel version did you test your patches? > > And which board? > Thanks for testing these patches. My patches are based on v3.18rc2. I tested my patches on am335x-evm using tslib. If you are encountering false pen-ups, charge-delay parameter needs to be tuned to your board. In some custom setups charge-delay of 0xB000 provided better performance. If you are using ts_test (from tslib) for testing try # ts_test > /dev/null for better performance. Please explain "touch is broken"? What is the behaviour of TSC? Which ADC channels are being used for TSC? Regards Vignesh > Thanks, > Richard > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
