linux-kernel - Re: [PATCH V5 6/6] coresight: etm4x: Add ACPI support in platform driver

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Message-ID: <ca00f50f-3c65-f5e3-eec3-5d5aa598d50b@arm.com>
Date:   Tue, 27 Jun 2023 10:42:49 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        scclevenger@...amperecomputing.com,
        Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Len Brown <lenb@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, devicetree@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 6/6] coresight: etm4x: Add ACPI support in platform
 driver

On 27/06/2023 10:20, Greg Kroah-Hartman wrote:
> On Tue, Jun 27, 2023 at 10:06:11AM +0100, Suzuki K Poulose wrote:
>> Hi Greg,
>>
>> On 29/05/2023 07:25, Anshuman Khandual wrote:
>>> From: Suzuki K Poulose <suzuki.poulose@....com>
>>>
>>> Drop ETM4X ACPI ID from the AMBA ACPI device list, and instead just move it
>>> inside the new ACPI devices list detected and used via platform driver.
>>>
>>> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
>>> Cc: Len Brown <lenb@...nel.org>
>>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
>>> Cc: Mike Leach <mike.leach@...aro.org>
>>> Cc: Leo Yan <leo.yan@...aro.org>
>>> Cc: Sudeep Holla <sudeep.holla@....com>
>>> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
>>> Cc: linux-acpi@...r.kernel.org
>>> Cc: coresight@...ts.linaro.org
>>> Cc: linux-arm-kernel@...ts.infradead.org
>>> Cc: linux-kernel@...r.kernel.org
>>> Reviewed-by: Sudeep Holla <sudeep.holla@....com> (for ACPI specific changes)
>>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>>> ---
>>>    drivers/acpi/acpi_amba.c                           |  1 -
>>>    drivers/hwtracing/coresight/coresight-etm4x-core.c | 10 ++++++++++
>>>    2 files changed, 10 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
>>> index f5b443ab01c2..099966cbac5a 100644
>>> --- a/drivers/acpi/acpi_amba.c
>>> +++ b/drivers/acpi/acpi_amba.c
>>> @@ -22,7 +22,6 @@
>>>    static const struct acpi_device_id amba_id_list[] = {
>>>    	{"ARMH0061", 0}, /* PL061 GPIO Device */
>>>    	{"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */
>>> -	{"ARMHC500", 0}, /* ARM CoreSight ETM4x */
>>>    	{"ARMHC501", 0}, /* ARM CoreSight ETR */
>>>    	{"ARMHC502", 0}, /* ARM CoreSight STM */
>>>    	{"ARMHC503", 0}, /* ARM CoreSight Debug */
>>
>> This is a bit awkward request.
>>
>> I would like to get your opinion on merging this to coresight tree.
>> This change is removing the coresight ETMv4 from the ACPI AMBA
>> scan list and moving it to the coresight driver. This change is
>> essential for
>> 1) Adding ACPI support for later versions of ETMv4 that are not AMBA
>>     devices.
>> 2) Adding power management support for AMBA ETMv4 with ACPI.
>>
>> The above change has been reviewed by Sudeep (Arm64 ACPI reviewer), but
>> hasn't been Acked by the ACPI maintainer (Rafael) even after a month of
>> follow up with at least 4 reminders [0].
>>
>> Are you happy with the Reviews from Sudeep and given the minimal
>> change to the drivers/acpi/acpi_amba.c file ?
> 
> As we can't do anything now with the merge window open, please resend
> after 6.5-rc1 is out and ask for the ACPI developers to ack this.

Sure, will do that.

Thanks
Greg