With CONFIG_PM=y, the omapfb/lcd device on Amstrad Delta, after initially starting correctly, breaks with the following error messages:
omapfb omapfb: resetting (status 0xffffff96,reset count 1) ... omapfb omapfb: resetting (status 0xffffff96,reset count 100) omapfb omapfb: too many reset attempts, giving up. Looking closer at this I have found that it had been broken almost 2 years ago with commit 2418996e3b100114edb2ae110d5d4acb928909d2, PM fixes for OMAP1. The definite reason for broken omapfb/lcd_ams_delta in PM mode appeared to be ARM_IDLECT1:IDLIF_ARM (bit 6) put into idle. The patch below fixes it. Created and tested against linux-2.6.32-rc5 Signed-off-by: Janusz Krzysztofik <[email protected]> --- Hi, I already reported this issue a few months ago, when drivers/video/omap/lcd_ams_delta.c was proposed to get into mainline - see http://www.spinics.net/lists/linux-omap/msg14546.html. Now I've found some time to look at it again. Since PM area is quite new to me, I am not sure if there may be a better solution. AFAICS, the standard way to prevent an ARM_CLKCT1 bit being switched to idle is to enable a clock that uses it (tipb_ck, dma_ck, or tc_ck or one of its children in this case, right?). I assume there is no bug in omapfb nor lcdc, as that would be already detected. Maybe it would be better to fix drivers/video/omap/lcd_ams_delta.c (or arch/arm/mach-omap1/board-ams-delta), but I don't know what clock should I enable, if any. --- linux-2.6.32-rc5/arch/arm/mach-omap1/pm.c.orig 2009-10-16 02:41:50.000000000 +0200 +++ linux-2.6.32-rc5/arch/arm/mach-omap1/pm.c 2009-10-29 22:07:58.000000000 +0100 @@ -45,6 +45,7 @@ #include <asm/irq.h> #include <asm/atomic.h> +#include <asm/mach-types.h> #include <asm/mach/time.h> #include <asm/mach/irq.h> @@ -139,7 +140,7 @@ void omap1_pm_idle(void) use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1); #endif - if (omap_dma_running()) + if ((omap_dma_running()) || (machine_is_ams_delta())) use_idlect1 &= ~(1 << 6); /* We should be able to remove the do_sleep variable and multiple -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
