On Mon, Oct 27, 2014 at 04:38:27PM +0530, Vignesh R wrote: > This series of patches fix TSC defects related to lag in touchscreen > performance and cursor jump at touch release. The lag was result of > udelay in TSC interrupt handler. Cursor jump due to false pen-up event. > The patches implement Advisory 1.0.31 in silicon errata of am335x-evm > to avoid false pen-up events and remove udelay. That advisory has two workarounds. You have chosen the second one? The text of the second workaround says it only works on 4 wire setups, so I wonder how 5 wire designs will be affected. > The advisory says to use > steps 1 to 4 for ADC and 5 to 16 for TSC (assuming 4 wire TSC and 4 channel > ADC). No, it doesn't say that. (sprz360f.pdf) > Further the X co-ordinate must be the last one to be sampled just > before charge step. The first two patches implement the required changes. FWIW, I implemented the first workaround and removed the udelay not too long ago. Like Sebastian, I saw the TSC unit hang after about 50000 interrupts when running with the workaround. Did you test you patch for very long? 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
