Hi Adam, On Monday 05 November 2012 16:02:08 Adam Wozniak wrote: > I'm working with a custom board based on an Overo WaterStorm com. The > processor is a DM3730. The kernel is 2.6.32 based. 2.6.32 very probably means you're using the old TI driver. Please don't. That's buggy and totally unsupported. I advice upgrading to the latest mainline kernel. > I'm trying to stress test the camera ISP by rapidly opening and closing > the video device with ( while true; do gst-launch v4l2src > device=/dev/video0 ! video/x-raw-yuv,width=320,height=240 ! > ffmpegcolorspace ! pngenc snapshot=true ! fakesink; done ) > > After many iterations, I will see the kernel spit out: > > [ 2502.802795] Unhandled fault: external abort on non-linefetch (0x1028) > at 0xfa0bce04 > [ 2502.810516] Internal error: : 1028 [#1] > [ ... ] > [ 2502.846893] PC is at isp_reg_readl+0x18/0x20 > [ 2502.851196] LR is at isp_reg_readl+0x10/0x20 > [ ... ] > [ 2503.296447] [<c02954a0>] (isp_reg_readl+0x18/0x20) from [<c02954f8>] > (isp_reg_and_or+0x1c/0x38) > [ 2503.305206] [<c02954f8>] (isp_reg_and_or+0x1c/0x38) from [<c029bad0>] > (isppreview_config_cfa+0x38/0x90) > [ 2503.314666] [<c029bad0>] (isppreview_config_cfa+0x38/0x90) from > [<c029bc5c>] (isppreview_config_datapath+0x134/0x330) > [ 2503.325347] [<c029bc5c>] (isppreview_config_datapath+0x134/0x330) > from [<c029be68>] (isppreview_s_pipeline+0x10/0xd0) > [ 2503.336029] [<c029be68>] (isppreview_s_pipeline+0x10/0xd0) from > [<c0296e98>] (isp_s_pipeline+0x1d8/0x280) > [ 2503.345672] [<c0296e98>] (isp_s_pipeline+0x1d8/0x280) from > [<bf036b98>] (cammux_streamon+0x218/0xa28 [cammux]) > [ ... ] > > > The register we're trying to access here is the ISP PRV_PCR. If I try > to add debug code to read ISP_CTRL right before the fault, the ISP_CTRL > access faults in the same way (i.e. the whole ISP is borked, not just > the previewer). > > At first I thought the clocks were being disabled somehow, but tracking > them seems to indicate that's not the case. Adding an early return in > arch/arm/mach/omap2/clock.c omap2_dflt_clk_disable() (i.e. to disable > disabling of clocks) does NOT help. > > What else might I be missing? What is necessary to be able to read the > ISP registers? -- Regards, Laurent Pinchart -- 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
