linux-kernel - Re: [PATCH v2] media: venus: pm_helpers: add fallback for the opp-table

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <56a6a3b8-bee4-46db-af15-8312067e28db@kernel.org>
Date: Thu, 18 Sep 2025 11:36:25 +0100
From: Bryan O'Donoghue <bod@...nel.org>
To: Renjiang Han <quic_renjiang@...cinc.com>, quic_qiweil@...cinc.com,
 quic_wangaow@...cinc.com, Vikash Garodia <quic_vgarodia@...cinc.com>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: Re: [PATCH v2] media: venus: pm_helpers: add fallback for the
 opp-table

On 18/09/2025 11:33, Bryan O'Donoghue wrote:
> On 18/09/2025 11:21, Renjiang Han wrote:
>>
>> On 9/4/2025 11:33 AM, Renjiang Han wrote:
>>>
>>> On 7/28/2025 11:20 PM, Bryan O'Donoghue wrote:
>>>> On 24/07/2025 08:53, Renjiang Han wrote:
>>>>> Since the device trees for both HFI_VERSION_1XX and HFI_VERSION_3XX
>>>>> do not include an opp-table and have not configured opp-pmdomain, they
>>>>> still need to use the frequencies defined in the driver's freq_tbl.
>>>>>
>>>>> Both core_power_v1 and core_power_v4 functions require 
>>>>> core_clks_enable
>>>>> function during POWER_ON. Therefore, in the core_clks_enable function,
>>>>> if calling dev_pm_opp_find_freq_ceil to obtain the frequency fails,
>>>>> it needs to fall back to the freq_tbl to retrieve the frequency.
>>>>>
>>>>> Fixes: b179234b5e59 ("media: venus: pm_helpers: use opp-table for 
>>>>> the frequency")
>>>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>>>>> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>>>>> Signed-off-by: Renjiang Han <quic_renjiang@...cinc.com>
>>>>> ---
>>>>> Since device trees for both HFI_VERSION_1XX and HFI_VERSION_3XX do not
>>>>> contain an opp-table and have not configured opp-pmdomain, they still
>>>>> need to use the frequencies defined in the driver's freq_tbl.
>>>>>
>>>>> Therefore, if calling dev_pm_opp_find_freq_ceil to obtain the 
>>>>> frequency
>>>>> fails in the core_clks_enable, it needs to fall back to the 
>>>>> freq_tbl to
>>>>> retrieve the frequency.
>>>>>
>>>>> Validated this series on QCS615 and msm8916.
>>>>> ---
>>>>> Changes in v2:
>>>>> - 1. Update the returned error value as per the feedback.
>>>>> - Link to v1: https://lore.kernel.org/r/20250723- 
>>>>> fallback_of_opp_table-v1-1-20a6277fdded@...cinc.com
>>>>> ---
>>>>>   drivers/media/platform/qcom/venus/pm_helpers.c | 11 ++++++++++-
>>>>>   1 file changed, 10 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/ 
>>>>> drivers/media/platform/qcom/venus/pm_helpers.c
>>>>> index 
>>>>> 8dd5a9b0d060cddfeafd4da477ade0c7aeb6c390..77c12273dbb9505244e260fc8fa635e4fe045236 100644
>>>>> --- a/drivers/media/platform/qcom/venus/pm_helpers.c
>>>>> +++ b/drivers/media/platform/qcom/venus/pm_helpers.c
>>>>> @@ -40,6 +40,8 @@ static int core_clks_get(struct venus_core *core)
>>>>>     static int core_clks_enable(struct venus_core *core)
>>>>>   {
>>>>> +    const struct freq_tbl *freq_tbl = core->res->freq_tbl;
>>>>> +    unsigned int freq_tbl_size = core->res->freq_tbl_size;
>>>>>       const struct venus_resources *res = core->res;
>>>>>       struct device *dev = core->dev;
>>>>>       unsigned long freq = 0;
>>>>> @@ -48,7 +50,14 @@ static int core_clks_enable(struct venus_core 
>>>>> *core)
>>>>>       int ret;
>>>>>         opp = dev_pm_opp_find_freq_ceil(dev, &freq);
>>>>> -    dev_pm_opp_put(opp);
>>>>> +    if (IS_ERR(opp)) {
>>>>> +        if (!freq_tbl)
>>>>> +            return -ENODEV;
>>>>> +        freq = freq_tbl[freq_tbl_size - 1].freq;
>>>>> +    } else {
>>>>> +        dev_pm_opp_put(opp);
>>>>> +    }
>>>>> +
>>>>>         for (i = 0; i < res->clks_num; i++) {
>>>>>           if (IS_V6(core)) {
>>>>>
>>>>> ---
>>>>> base-commit: d086c886ceb9f59dea6c3a9dae7eb89e780a20c9
>>>>> change-id: 20250721-fallback_of_opp_table-4ea39376f617
>>>>>
>>>>> Best regards,
>>>>
>>>> Note to self add a
>>>>
>>>> Closes: 
>>>> CA+G9fYu5=3n84VY+vTbCAcfFKOq7Us5vgBZgpypY4MveM=eVwg@...l.gmail.com
>>> Thanks for helping review this patch. But I'm sorry, may I ask how to
>>> understand this comment?
>>>
>>> This patch has not been picked yet.Is there anything else I need to do?
>> I’d appreciate any thoughts you might have on this.
>>>>
>>>>
>>>> ---
>>>> bod
>>>
> 
> Marked as "Not applicable" on media-ci patchwork - you should have 
> received an email about that.
> 
> * 7881cd6886a89 - media: venus: Fix OPP table error handling (6 weeks ago)
> * b179234b5e590 - media: venus: pm_helpers: use opp-table for the 
> frequency (3 months ago)
> * 14423fc3a4a21 - media: venus: pm_helpers: add compatibility for 
> dev_pm_genpd_set_hwmode on V4 (5 months ago)
> 
> git checkout -b linux-next/master-25-09-18 linux-next/master
> Updating files: 100% (10211/10211), done.
> branch 'linux-next/master-25-09-18' set up to track 'linux-next/master'.
> 
> b4 shazam b4e25dd2-caf3-48f0-8e1b-622f3db1b7ca@...cinc.com
> Grabbing thread from lore.kernel.org/all/b4e25dd2- 
> caf3-48f0-8e1b-622f3db1b7ca@...cinc.com/t.mbox.gz
> Checking for newer revisions
> Grabbing search results from lore.kernel.org
> Analyzing 5 messages in the thread
> Looking for additional code-review trailers on lore.kernel.org
> Analyzing 0 code-review messages
> Checking attestation on all messages, may take a moment...
> ---
>    ✓ [PATCH v2] media: venus: pm_helpers: add fallback for the opp-table
>      + Closes: 
> CA+G9fYu5=3n84VY+vTbCAcfFKOq7Us5vgBZgpypY4MveM=eVwg@...l.gmail.com (✗ 
> DKIM/linaro.org)
>      + Reviewed-by: Vikash Garodia <quic_vgarodia@...cinc.com> (✓ DKIM/ 
> quicinc.com)
>    ---
>    ✗ No key: ed25519/quic_renjiang@...cinc.com
>    ✓ Signed: DKIM/quicinc.com
> ---
> Total patches: 1
> ---
>   Base: using specified base-commit 
> d086c886ceb9f59dea6c3a9dae7eb89e780a20c9
> Applying: media: venus: pm_helpers: add fallback for the opp-table
> Patch failed at 0001 media: venus: pm_helpers: add fallback for the opp- 
> table
> error: patch failed: drivers/media/platform/qcom/venus/pm_helpers.c:48
> error: drivers/media/platform/qcom/venus/pm_helpers.c: patch does not apply
> hint: Use 'git am --show-current-patch=diff' to see the failed patch
> hint: When you have resolved this problem, run "git am --continue".
> hint: If you prefer to skip this patch, run "git am --skip" instead.
> hint: To restore the original branch and stop patching, run "git am -- 
> abort".
> hint: Disable this message with "git config set advice.mergeConflict false"
> 
> ---
> bod

"Not Applicable" -> "Changes Requested"

---
bod