From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivaylo Dimitrov Date: Thu, 09 Jan 2014 07:34:59 +0000 Subject: Re: RE: [PATCH 1/2] ARM: omapfb: add coherent dma memory support Message-Id: <52CE5123.9050702@gmail.com> List-Id: References: <1388409550-10720-1-git-send-email-tomi.valkeinen@ti.com> <1388409550-10720-2-git-send-email-tomi.valkeinen@ti.com> <20140107235951.GH5074@atomide.com> <52CD5D13.9090806@ti.com> <79CD15C6BA57404B839C016229A409A83EDB11F5@DBDE04.ent.ti.com> In-Reply-To: <79CD15C6BA57404B839C016229A409A83EDB11F5@DBDE04.ent.ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org On 09.01.2014 07:06, Hiremath, Vaibhav wrote: > Tomi, > > I am seeing underflow issue on AM43x device if I use omapfb_vram argument. > Did you see this on OMAP? > > I am using "omapfb_vramM@0xA0000000", and I believe it is correct way of usage. > > Thanks, > Vaibhav > AFAIK underflow interrupts could come from badly calculated DSS core clock or bad HW resizer setup and should be unrelated to the memory allocation. It might be something similar to the problem I have on N900 - see https://lkml.org/lkml/2014/1/6/173 Is it possible to upload the video you have problems with, so me to test it on N900? So far I didn't see any underflow issues on it (N900 is OMAP3, in case you're not aware), no matter the resolution of the videos I played(up to 720p), however I didn't test the part that allocates the memory on a pre-defined address. Though I don't think that should matter. Ivo