* Tony Lindgren <tony@xxxxxxxxxxx> [140429 16:53]: > Otherwise we can get often errors like the following and the > display won't come on: > > omapdss APPLY error: FIFO UNDERFLOW on gfx, disabling the overlay > omapdss APPLY error: SYNC_LOST on channel lcd, restarting > the output with video overlays disabled > > There are some earlier references to this issue: > > http://www.spinics.net/lists/linux-omap/msg59511.html > http://www.spinics.net/lists/linux-omap/msg59724.html > > It seems that it's safe to set the lower values even for 3630. > If we can confirm that 3630 works with the higher values > reliably we can add further detection. BTW, I'm also seeing this warning on 3730-evm it may be related: [ 3.523101] ------------[ cut here ]------------ [ 3.528015] WARNING: CPU: 0 PID: 6 at drivers/video/fbdev/omap2/dss/dss.c:483 dss_set_fck_rate+0x6c/0x8c() [ 3.538360] clk rate mismatch: 108000000 != 115200000 [ 3.543518] Modules linked in: [ 3.546966] CPU: 0 PID: 6 Comm: kworker/u2:0 Tainted: G W 3.15.0-rc3-00015-gaa296fa-dirty #391 [ 3.557159] Workqueue: deferwq deferred_probe_work_func [ 3.562774] [<c0014cbc>] (unwind_backtrace) from [<c001191c>] (show_stack+0x10/0x14) [ 3.571014] [<c001191c>] (show_stack) from [<c05660b4>] (dump_stack+0x80/0x9c) [ 3.578704] [<c05660b4>] (dump_stack) from [<c003f558>] (warn_slowpath_common+0x68/0x8c) [ 3.587249] [<c003f558>] (warn_slowpath_common) from [<c003f610>] (warn_slowpath_fmt+0x30/0x40) [ 3.596496] [<c003f610>] (warn_slowpath_fmt) from [<c03129f0>] (dss_set_fck_rate+0x6c/0x8c) [ 3.605407] [<c03129f0>] (dss_set_fck_rate) from [<c0323728>] (dpi_display_enable+0x23c/0x2e4) [ 3.614562] [<c0323728>] (dpi_display_enable) from [<c03323a8>] (sharp_ls_enable+0x58/0xc4) [ 3.623474] [<c03323a8>] (sharp_ls_enable) from [<c0335ee0>] (omapfb_probe+0x548/0x848) [ 3.631988] [<c0335ee0>] (omapfb_probe) from [<c0378cfc>] (platform_drv_probe+0x18/0x48) [ 3.640594] [<c0378cfc>] (platform_drv_probe) from [<c0377938>] (driver_probe_device+0x110/0x22c) [ 3.650024] [<c0377938>] (driver_probe_device) from [<c0376038>] (bus_for_each_drv+0x44/0x8c) [ 3.659088] [<c0376038>] (bus_for_each_drv) from [<c03777f0>] (device_attach+0x74/0x8c) [ 3.667541] [<c03777f0>] (device_attach) from [<c0376ecc>] (bus_probe_device+0x88/0xb0) [ 3.676025] [<c0376ecc>] (bus_probe_device) from [<c03772d0>] (deferred_probe_work_func+0x64/0x94) [ 3.685546] [<c03772d0>] (deferred_probe_work_func) from [<c0057220>] (process_one_work+0x1b4/0x4bc) [ 3.695251] [<c0057220>] (process_one_work) from [<c0057908>] (worker_thread+0x11c/0x398) [ 3.704620] [<c0057908>] (worker_thread) from [<c005df10>] (kthread+0xc8/0xe4) [ 3.712280] [<c005df10>] (kthread) from [<c000e768>] (ret_from_fork+0x14/0x2c) [ 3.719909] ---[ end trace 1c9526c1a2975498 ]--- > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> > --- > drivers/video/fbdev/omap2/dss/dss.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/video/fbdev/omap2/dss/dss.c b/drivers/video/fbdev/omap2/dss/dss.c > index d55266c..ad6561f 100644 > --- a/drivers/video/fbdev/omap2/dss/dss.c > +++ b/drivers/video/fbdev/omap2/dss/dss.c > @@ -707,9 +707,10 @@ static const struct dss_features omap34xx_dss_feats __initconst = { > .dpi_select_source = &dss_dpi_select_source_omap2_omap3, > }; > > +/* Supposedly 3630 can use div 32 mult 2, but that needs to be rechecked */ > static const struct dss_features omap3630_dss_feats __initconst = { > - .fck_div_max = 32, > - .dss_fck_multiplier = 1, > + .fck_div_max = 16, > + .dss_fck_multiplier = 2, > .parent_clk_name = "dpll4_ck", > .dpi_select_source = &dss_dpi_select_source_omap2_omap3, > }; > -- > 1.8.1.1 > > -- > 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
