> -----Original Message----- > From: linux-input-owner@xxxxxxxxxxxxxxx [mailto:linux-input-owner@xxxxxxxxxxxxxxx] On Behalf Of Bastien Nocera > Sent: 30 June, 2015 18:56 > To: Tirdea, Irina; Dmitry Torokhov; Mark Rutland; linux-input@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx; Rob Herring; Pawel Moll; Ian Campbell; Kumar Gala; Purdila, Octavian > Subject: Re: [PATCH v3 3/5] Input: goodix - add power management support > > On Mon, 2015-06-29 at 19:28 +0300, Irina Tirdea wrote: > > Implement suspend/resume for goodix driver. > > > > The suspend and resume process uses the gpio pins. > > If the device ACPI/DT information does not declare gpio pins, > > suspend/resume will not be available for these devices. > > > > This is based on Goodix datasheets for GT911 and GT9271 > > and on Goodix driver gt9xx.c for Android (publicly available > > in Android kernel trees for various devices). > > How can I functionally test this? We are testing the power management feature by putting the system in suspend and measuring the power consumed by the touchscreen using HW measurement tools. I can send a set of patches that export an interface to put the touchscreen into suspend from sysfs (something similar to what ads7846 has). In this way you can test what happens to the touchscreen alone without putting the entire system into suspend. When suspending the device you will see that there are no events received from the touchscreen (the interrupt is unregistered before suspending the device). To actually check that the device has been suspended and is not consuming power you need to measure the power consumed by the touchscreen. To do that entirely from software, you could compare the power consumed by the battery when the touchscreen is powered on with the power consumed by the battery when the touchscreen is powered off (batteries export interfaces in sysfs that can be used for that). The difference should match the device specifications. I am doing some tests to see how that works, but I am not getting the expected results so far (seems there are other components that affect the measurements). I will look more into this and come back with details if you think this would work for you. Thanks, Irina > -- > 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 ��.n��������+%������w��{.n����z�{��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
