On Sat, 2008-12-06 at 16:51 -0700, ext Paul Walmsley wrote: > Hi Tomi, > > nice test case. > > On Fri, 5 Dec 2008, Tomi.Valkeinen@xxxxxxxxx wrote: > > > I have had strange clk_enable() crashes with DSS2, and now I managed to > > isolate it. With the included patch, on OMAP3 SDP board, with default > > kernel config, I always get the crash below. In this example case it > > happens at specific time on boot, but with DSS2 it happens randomly at > > runtime, when I enable the DSS clocks. > > Looks like there's some problem with the DSS driver's usage of > dss_tv_fclk. Enabling dss_tv_fclk before entering your test code's > while-loop makes the problem go away here. Patch below. > > As an aside, your test patch does not actually disable dss1_fclk, since it > is already enabled by the time the while-loop starts. So you might also > want to add a clk_disable(c2) before your while-loop starts, when you > test. > > Based on the traceback that you sent, I'd conjecture that probably some > part of the DSS subsystem is generating an interrupt via DSS_IRQ; but then > dss_iclk ends up disabled, and the MPU INTC is not able to communicate > with the DSS, and the INTC wedges. (The aborting access is to 0xd8200098, > the INTCPS_PENDING_IRQ0 register, rather than a DSS register.) Probably > some IRQs need to be masked before disabling the dss_iclk. It doesn't seem to be DSS related, the same crash happens also with cam_ick and sgx_ick. Tomi -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
