From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Date: Mon, 15 Feb 2010 10:57:34 +0000 Subject: RE: [PATCH 01/13] OMAP: DSS2: enable VDDS_DSI when using DPI Message-Id: <1266231454.2433.357.camel@tubuntu.research.nokia.com> List-Id: References: <1265644572-3578-1-git-send-email-tomi.valkeinen@nokia.com> <1265644572-3578-2-git-send-email-tomi.valkeinen@nokia.com> <19F8576C6E063C45BE387C64729E7394044A96DE7B@dbde02.ent.ti.com> In-Reply-To: <19F8576C6E063C45BE387C64729E7394044A96DE7B@dbde02.ent.ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "ext Hiremath, Vaibhav" Cc: "linux-omap@vger.kernel.org" , "linux-fbdev@vger.kernel.org" On Mon, 2010-02-15 at 11:22 +0100, ext Hiremath, Vaibhav wrote: > > -----Original Message----- > > From: linux-omap-owner@vger.kernel.org [mailto:linux-omap- > > owner@vger.kernel.org] On Behalf Of Tomi Valkeinen > > Sent: Monday, February 08, 2010 9:26 PM > > To: linux-omap@vger.kernel.org; linux-fbdev@vger.kernel.org > > Cc: Tomi Valkeinen > > Subject: [PATCH 01/13] OMAP: DSS2: enable VDDS_DSI when using DPI > > > > It looks like on OMAP3 some DSS pins need VDDS_DSI to function > > properly. > > > > This has not been confirmed from TI, but looking at figure 15-1 > > "Display > > subsystem highlight" from the TRM, some data pins come near the DSI > > and SDI > > blocks. This is not very hard evidence, but the fact remains that > > with the > > power on, pixels are ok, and with the power off, pixels are not ok. > > > [Hiremath, Vaibhav] Tomi, sorry for delayed response. As usual stuck with some other issues. Below are some quick comments - > > I am not regulator expert, but as per my finding I believe it is nothing to do with pins position closure to each other. The actual root cause is TWL4030 Ownership bit. Please refer to the below mail-chain - > > http://marc.info/?l=linux-omap&m6045146600334&w=2 But why is there a dependency on a regulator, if it has nothing to do with the pins? Why is vdds_dsi/vdds_sdi needed to get all pixels through? Tomi