Re: [PATCHv2 15/15] clk: ti: convert to use proper register definition for all accesses

[Tero Kristo <t-kristo@ti.com>]

On 17/01/18 23:44, Adam Ford wrote:
> On Wed, Jan 17, 2018 at 3:19 PM, Tony Lindgren <tony@atomide.com> wrote:
>> * Adam Ford <aford173@gmail.com> [180117 15:15]:
>>> On Wed, Jan 17, 2018 at 8:02 AM, Tero Kristo <t-kristo@ti.com> wrote:
>>>> On 17/01/18 15:27, Adam Ford wrote:
>>>>>
>>>>> On Sat, Mar 11, 2017 at 6:50 AM, Tero Kristo <t-kristo@ti.com> wrote:
>>>>>>
>>>>>> Currently, TI clock driver uses an encapsulated struct that is cast into
>>>>>> a void pointer to store all register addresses. This can be considered
>>>>>> as rather nasty hackery, and prevents from expanding the register
>>>>>> address field also. Instead, replace all the code to use proper struct
>>>>>> in place for this, which contains all the previously used data.
>>>>>>
>>>>>> This patch is rather large as it is touching multiple files, but this
>>>>>> can't be split up as we need to avoid any boot breakage.
>>>>>>
>>>>>
>>>>> I know it's late coming, but according to git bisect, this patch is
>>>>> causing some problems with Logic PD Torpedo 37xx Dev kit.
>>>>
>>>>
>>>> Oh reporting bugs is never too late, thanks for posting this out.
>>>>
>>>>>
>>>>> It it is a DM3730 that has a WL1283 chipset attached to the SDIO
>>>>> interface on MMC3.  The driver seems to load properly, but when
>>>>> loading wpa_supplicant to activate the WL1283, we get a giant crash.
>>>>> I checked kernel revisions starting at 4.14 and working back to when
>>>>> it worked, then used git bisect from there.
>>>>>
>>>>> I am hoping it might be a simple fix for something that just needs to
>>>>> get added or tweaked in the device tree.
>>>>
>>>>
>>>> I don't have access to the specific hw, but can you try to dig out which
>>>> hwmod is causing the crash? Just print out the oh->name from the
>>>> _wait_softreset_complete. That would help root causing the issue.
>>>>
>>>
>>> With one small patch, I was able to make it work again.
>>>
>>> diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
>>> index 2dbd632..ed1f625 100644
>>> --- a/arch/arm/mach-omap2/omap_hwmod.c
>>> +++ b/arch/arm/mach-omap2/omap_hwmod.c
>>> @@ -477,7 +477,7 @@ static int _wait_softreset_complete(struct omap_hwmod *oh)
>>>          int c = 0;
>>>
>>>          sysc = oh->class->sysc;
>>> -
>>> +pr_warn("_wait_softreset_complete: %s\n", oh->name);
>>>          if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
>>>                  omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
>>>                                     & SYSS_RESETDONE_MASK),
>>>
>>>
>>> This leads me to believe that the omap_test_timeout functions might
>>> not be working quite right.
>>
>> There may be a srst_udelay needed for some module, see commit
>> ebf244148092 ("ARM: OMAP2+: Use srst_udelay for USB on dm814x")
>> for example.
>>
>> You might be able to find which module it is by commenting out
>> postcore_initcall_sync(omap3_l3_init) in drivers/bus/omap_l3_smx.c
>> temporarily as the system will most likely hang right there.
> 
> I commented out that line as you suggested, but the system boots as
> normal and I get the crash (as normal)
> 
> I am looking through the DM3730 and OMAP3630 TRM now.  Any thought on
> a keyword search I should use to see which hwmods might require
> srst_udelay?

Looking at the log you provided, it looks like only mmc1, mmc3 and i2c1 
are reset during the wlan probe. Based on the prints coming out in the 
failing case, it looks like the culprit might be mmc3 for some reason.

[   18.239746] _wait_softreset_complete: mmc3
[   18.638580] _wait_softreset_complete: mmc3
[   18.657562] _wait_softreset_complete: mmc1
[   18.833374] wlcore: firmware booted (Rev 7.3.10.0.141)

^ the firmware notification above does not come out in the crash.

-Tero

> 
> adam
> 
>>
>> Regards,
>>
>> Tony
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