linux-kernel - Re: [PATCH v4 0/3] add sysfs nodes to configure TPDA's registers

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Message-ID: <427a8b79-075e-43d6-b580-510f99f547c9@oss.qualcomm.com>
Date: Thu, 6 Nov 2025 13:21:04 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Tao Zhang <tao.zhang@....qualcomm.com>
Subject: Re: [PATCH v4 0/3] add sysfs nodes to configure TPDA's registers



On 10/28/2025 10:02 AM, Jie Gan wrote:
> Patchset 1 introduces configuration of the cross-trigger registers with
> appropriate values to enable proper generation of cross-trigger packets.
> 
> Patchset 2 introduces a logic to configure the TPDA_SYNCR register,
> which determines the frequency of ASYNC packet generation. These packets
> assist userspace tools in accurately identifying each valid packet.
> 
> Patchset 3 introduces a sysfs node to initiate a flush request for the
> specific port, forcing the data to synchronize and be transmitted to the
> sink device.
> 

Gentle reminder.

> Changes in V4:
> 1. Document sysfs nodes with correct kernel version and date.
> Link to V3 - https://lore.kernel.org/linux-arm-kernel/20250827105545.7140-1-jie.gan@oss.qualcomm.com/
> 
> Changes in V3:
> 1. Optimizing codes according to James's comment.
> Link to V2 - https://lore.kernel.org/all/20250827042042.6786-1-jie.gan@oss.qualcomm.com/
> 
> Changes in V2:
> 1. Refactoring the code based on James's comment for optimization.
> Link to V1 - https://lore.kernel.org/all/20250826070150.5603-1-jie.gan@oss.qualcomm.com/
> 
> Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
> ---
> Tao Zhang (3):
>        coresight: tpda: add sysfs nodes for tpda cross-trigger configuration
>        coresight: tpda: add logic to configure TPDA_SYNCR register
>        coresight: tpda: add sysfs node to flush specific port
> 
>   .../ABI/testing/sysfs-bus-coresight-devices-tpda   |  50 ++++
>   drivers/hwtracing/coresight/coresight-tpda.c       | 278 +++++++++++++++++++++
>   drivers/hwtracing/coresight/coresight-tpda.h       |  33 ++-
>   3 files changed, 360 insertions(+), 1 deletion(-)
> ---
> base-commit: 8fec172c82c2b5f6f8e47ab837c1dc91ee3d1b87
> change-id: 20251028-configure_tpda_reg-f3396f97f9a1
> 
> Best regards,