From mboxrd@z Thu Jan 1 00:00:00 1970 From: richardcochran@gmail.com (Richard Cochran) Date: Tue, 16 Dec 2014 16:30:48 +0100 Subject: [PATCH v4 0/6] Touchscreen performance related fixes In-Reply-To: References: <1415941651-28962-1-git-send-email-vigneshr@ti.com> <20141124115116.GA14997@linutronix.de> <547C3A95.30605@ti.com> <547C3C19.5090501@linutronix.de> <547C42FF.5010700@ti.com> <548A0125.6040708@linutronix.de> <912A29987EAE174BA6CF187D7CDFA9CE26FA135A@DLEE08.ent.ti.com> Message-ID: <20141216153048.GA16981@localhost.localdomain> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Dec 16, 2014 at 10:31:47AM +0200, Catalin Crenguta wrote: > > It seems that because the ribbon cable has both the analog and digital > signals, the analog signals are affected by the digital ones (hence > the touchscreen was working OK when the display was disabled). Putting > decoupling capacitors on X+, X-, Y+, Y- reduces the noise and the > false events disappear. IOW, the root cause is a design flaw in the BB-View 4.3 Cape? Thanks, Richard