[PATCH] ARM: OMAP3xxx: clockdomain: fix software supervised wakeup/sleep
From: Rajendra Nayak <hidden>
Date: 2012-07-31 05:41:03
Also in:
linux-omap
Hi Jon, On Tuesday 31 July 2012 10:11 AM, Jon Hunter wrote:
Hi Paul, Rajendra, On 07/27/2012 12:43 AM, Rajendra Nayak wrote:quoted
On Friday 27 July 2012 02:34 AM, Paul Walmsley wrote:quoted
Commit 4da71ae6 ("OMAP: clockdomain: Arch specific funcs for clkdm_clk_enable/disable") called the OMAP2xxx-specific functions for clockdomain wakeup and sleep. This would probably have broken software-supervised clockdomain wakeup and sleep on OMAP3.Its strange this went unnoticed for so long. Thanks for this fix and sorry about introducing the bug in the first place.Any chance that's because of the following code? I needed to remove this to get the EMU clock domain to turn off on OMAP3 whilst testing PMU.
No, this doesn't seem right. We still have clockdomains for omap2/3 controlled using clkdm_clk_enable/disable functions called from within clk framework, and not clkdm_hwmod_enable/disable from within hwmod framework. Besides you removing these checks only in clkdm_hwmod_disable (and keeping them in clkdm_hwmod_enable) tells me its just hiding some usecounting issues you were having with clkdm_clk_enable/disable. Btw, on OMAP2/3 as long as a domain has interface clocks which are explicitly enabled and autoidled, the clkdm usecount never ends up going to 0, which is probably what you are hit with too. regards, Rajendra
quoted hunk ↗ jump to hunk
Cheers Jon commit a0307bd539ecef976793679a1c4ff0d47b22c4bd Author: Jon Hunter[off-list ref] Date: Mon Jul 30 18:04:06 2012 -0500 ARM: OMAP2/3: Allow HWMOD to disable clock domains Currently when HWMOD attempts to disable a clock domain on OMAP2/3 devices we will return from the function clkdm_hwmod_disable() without actually disabling the clock domain. Per the comment this is deliberate because initially HWMOD OMAP2/3 devices did not support clock domains. However, clock domains are now supported by HWMOD for these devices and so allow HWMOD to disable the clock domains. XXX - Tested on OMAP3430 beagle board, but needs more testing on OMAP2/3diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c index 011186f..8f7a941 100644 --- a/arch/arm/mach-omap2/clockdomain.c +++ b/arch/arm/mach-omap2/clockdomain.c@@ -1075,10 +1075,6 @@ int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh) */ int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh) { - /* The clkdm attribute does not exist yet prior OMAP4 */ - if (cpu_is_omap24xx() || cpu_is_omap34xx()) - return 0; - /* * XXX Rewrite this code to maintain a list of enabled * downstream hwmods for debugging purposes?