> On Don, 2011-12-08 at 19:35 +0800, chenhc@xxxxxxxxxx wrote: >> >> I found CP_RB_WPTR has changed when "ring test failed", so I think CP is >> active, but what it get from ring buffer is wrong. > > CP_RB_WPTR is normally only changed by the CPU after adding commands to > the ring buffer, so I'm afraid that may not be a valid conclusion. > > I'm sorry, I've made a spelling mistake. In fact, CP_RB_RPTR and CP_RB_WPTR both changed, so I think CP is active. >> Then, I want to know whether there is a way to check the content that >> GPU get from ring buffer. > > See the r100_debugfs_cp_csq_fifo() function, which generates the output > for /sys/kernel/debug/dri/0/r100_cp_csq_fifo. > Hmmm, I don't think this function can be used by r600 (or write a similar one for R600), because I haven't found CSQ registers in r600 code. > >> BTW, when I use "echo shutdown > /sys/power/disk; echo disk > >> /sys/power/state" to do a hibernation, there will be occasionally "GPU >> reset" just like suspend. However, if I use "echo reboot > >> /sys/power/disk; echo disk > /sys/power/state" to do a hibernation and >> wakeup automatically, there is no "GPU reset" after hundreds of tests. >> What does this imply? Power loss cause something break? > > Yeah, it sounds like the resume code doesn't properly re-initialize > something that's preserved on a warm boot but lost on a cold boot. > > > -- > Earthling Michel D _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
