Subject: [PATCH] ARM: OMAP3xxx: clockdomain: fix software supervised wakeup/sleep

From: [email-masked] (Jon Hunter)
Date: Mon, 30 Jul 2012 23:41:12 -0500

Hi Paul, Rajendra,

On 07/27/2012 12:43 AM, Rajendra Nayak wrote:
> On Friday 27 July 2012 02:34 AM, Paul Walmsley wrote:
>>
>> 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.

Cheers
Jon

commit a0307bd539ecef976793679a1c4ff0d47b22c4bd
Author: Jon Hunter <[email-masked]>
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 OMAP2/3

diff --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?