On Tue, Oct 20, 2015 at 01:24:13AM +0300, Aaro Koskinen wrote: > On Mon, Oct 19, 2015 at 09:05:22PM +0100, Russell King - ARM Linux wrote: > > On Mon, Oct 19, 2015 at 10:37:59PM +0300, Aaro Koskinen wrote: > > > Hi, > > > > > > Somewhere between 4.1 .. 4.3-rc6 framebuffer on Nokia 770 stopped working. > > > > > > Bisection points to: > > > > > > commit 2568999835d7797afce3dcc3a3f368051ffcaf1f > > > Author: Russell King <rmk+ker...@arm.linux.org.uk> > > > Date: Mon Mar 2 15:40:29 2015 +0000 > > > > > > clkdev: add clkdev_create() helper > > > > > > The commit cannot be reverted cleanly from current trees, but I re-tested > > > that commit 2568999835d7797afce3dcc3a3f368051ffcaf1f does not work and > > > commit 2568999835d7797afce3dcc3a3f368051ffcaf1f^1 indeed works. > > > > Really need more information than that, like a kernel log or something. > > This is a device with normal consumer electronics mechnics so serial > port access is PITA. However I managed to get a boot log, see below, > it's from commit 2568999835d7797afce3dcc3a3f368051ffcaf1f.
Hmm, that points to a driver that doesn't bother checking whether it successfully got any resources: hwa742.sys_ck = clk_get(NULL, "hwa_sys_ck"); spin_lock_init(&hwa742.req_lock); if ((r = hwa742.int_ctrl->init(fbdev, 1, req_vram)) < 0) goto err1; if ((r = hwa742.extif->init(fbdev)) < 0) goto err2; ext_clk = clk_get_rate(hwa742.sys_ck); There's no check here that clk_get() actually worked, and this will be why you then end up with the division by zeros. That's someone elses problem though. :) > > Can you try this patch please? > > Unfortunately with the patch it dies even earlier, without any output. It shouldn't (I've been through the resulting assembly code.) I wonder if this is fixing the problem, but it's now failing elsewhere instead. What happens if you change it to: l = clkdev_create(r, alias, alias_dev_name); which should be 100% identical to how older kernels behaved - if that works, can you print out 'alias' and 'alias_dev_name' for every call to clk_add_alias() and send that please? -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html