On Tue, May 26, 2015 at 09:34:10PM +0000, Cooper Jr., Franklin wrote: > > > > -----Original Message----- > > From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf Of Michael > > Welling > > Sent: Tuesday, May 26, 2015 4:29 PM > > To: Cooper Jr., Franklin > > Cc: Balbi, Felipe; dmitry.torokhov@xxxxxxxxx; R, Vignesh; Griffis, Brad; > > jic23@xxxxxxxxxx; wsa@xxxxxxxxxxxxx; linux-input@xxxxxxxxxxxxxxx; > > GWilson@xxxxxxxxxxxx; linux-iio@xxxxxxxxxxxxxxx > > Subject: Re: AM335x touchscreen issues > > > > On Tue, May 26, 2015 at 09:15:53PM +0000, Cooper Jr., Franklin wrote: > > > Michael, > > > > > > Can you send me the output of ts_test_raw after you done a 5 or so touch > > down and touch up events? In the output let me know at which point in the > > log that the issue you observed has occurred. Please try to avoid moving your > > finger since I want to see the full output of that program but I'm not > > interested any unnecessary pen down events. > > > > > > > Oddly the repeated pen up and down events do not occur when running > > ts_print_raw: > > root@som3517-som200:~# ts_print_raw > > 1418169393.147827: 1648 2075 206 > > 1418169393.229976: 1725 1983 240 > > 1418169393.312154: 1731 1980 240 > > 1418169393.394333: 1706 2043 239 > > 1418169393.476523: 1703 2028 241 > > 1418169393.558708: 1714 2041 240 > > 1418169393.640888: 1704 2041 240 > > 1418169393.721556: 0 0 0 > > 1418169395.283096: 2889 2512 192 > > 1418169395.365236: 2947 2486 210 > > 1418169395.447413: 2949 2470 211 > > 1418169395.529606: 2943 2497 211 > > 1418169395.611759: 2922 2506 211 > > 1418169395.693935: 2866 2474 213 > > 1418169395.776135: 2858 2481 214 > > 1418169395.858305: 2861 2451 213 > > 1418169395.938972: 0 0 0 > > 1418169397.482867: 1083 1981 236 > > 1418169397.565026: 1157 1832 254 > > 1418169397.647217: 1161 1856 256 > > 1418169397.729412: 1158 1883 255 > > 1418169397.811583: 1159 1841 255 > > 1418169397.893760: 1159 1864 256 > > 1418169397.975947: 1158 1893 256 > > 1418169398.056605: 0 0 0 > > 1418169399.690290: 2299 2372 178 > > 1418169399.772432: 2388 2160 221 > > 1418169399.854611: 2391 2190 223 > > 1418169399.936802: 2379 2207 223 > > 1418169400.018966: 2389 2184 223 > > 1418169400.101146: 2383 2208 224 > > 1418169400.183338: 2381 2203 223 > > 1418169400.264012: 0 0 0 > > 1418169402.073266: 1230 2381 212 > > 1418169402.155413: 1301 2097 247 > > 1418169402.237590: 1313 2077 248 > > 1418169402.319772: 1307 2126 248 > > 1418169402.401948: 1304 2096 248 > > 1418169402.484127: 4078 2155 58 > > 1418169402.564801: 0 0 0 > > > > Here is what the output of ts_test looks like without even touching the > > screen: > > root@som3517-som200:~# ts_test > > 1418169549.722957: 816 17 58 > > 1418169549.803604: 816 17 0 > > 1418169549.817757: 816 25 58 > > 1418169549.898411: 816 25 0 > > 1418169549.912828: 816 41 59 > > 1418169549.993463: 816 41 0 > > 1418169550.007771: 816 28 58 > > 1418169550.088404: 816 28 0 > > 1418169550.102828: 816 33 58 > > 1418169550.183486: 816 33 0 > > 1418169550.197767: 816 42 59 > > 1418169550.278401: 816 42 0 > > 1418169550.292970: 816 23 58 > > 1418169550.373604: 816 23 0 > > 1418169550.387773: 816 28 58 > > 1418169550.468404: 816 28 0 > > 1418169550.482955: 816 32 59 > > 1418169550.563600: 816 32 0 > > 1418169550.577773: 816 25 58 > > 1418169550.658406: 816 25 0 > > 1418169550.672827: 816 35 59 > > 1418169550.753464: 816 35 0 > > 1418169550.767761: 816 42 59 > > 1418169550.848407: 816 42 0 > > 1418169550.862826: 816 41 59 > > 1418169550.943462: 816 41 0 > > 1418169550.958013: 816 37 59 > > 1418169551.038655: 816 37 0 > > 1418169551.052824: 816 41 59 > > 1418169551.133475: 816 41 0 > > 1418169551.147774: 816 28 58 > > 1418169551.228406: 816 28 0 > [Franklin] So your saying the above ts_test is being ran and you never touched the screen? Yes. > Looking at the mailing list post you sent earlier it seems like the goal is for the ADC to be used at the same time. > Is that the case when you ran both ts_test and ts_print_raw? No. I am not sampling the ADC. This happening without any interaction with the screen. > > > > . > > . > > > > > I recently encountered several touchscreen problems that I am working on > > submitting to mainline. Below are the variety of issues I discovered and fixed > > but its currently based on 3.14 kernel. > > > > > > 1. The x and y location right before a penup event is usually incorrect. > > Visibly the causes the cursor to jump right before a touchup. So I > > implemented a way to ignore that incorrect event. > > > 2. I discovered that for some reason a series of touch up events are sent > > back to back. So I added something to ignore consecutive pen up events. > > > 3. Sometimes a pen down event is reported with a pressure of 0. I noticed > > applications like ts_lib looked at the pressure and thought a pressure of 0 > > means a finger was lifted. So I added a patch that ignored 0 pressure pen > > down events. This prevented premature touchups. > > > 4. I added debouncing. Essentially the driver didn't report any touch events > > for a user specified number of ms after a pen up occured. It was noticed > > especially during touchscreen calibration that after a person lifted their finger > > after touching the screen a combination of pen up and pen down events > > were incorrectly detected. > > > > > > Most likely a combination of 2-4 is your problem. I think the udelay acted > > like an unintentional debounce which is probably why it wasn't discovered > > sooner. > > > > > > > > > > -- > > > > > balbi > > > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
