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

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Message-ID: <a59ccd01-1482-4091-957f-740840ff5112@linaro.org>
Date: Thu, 18 Sep 2025 11:33:50 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.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 11:21, 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
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lore.kernel.org/all/b4e25dd2-caf3-48f0-8e1b-622f3db1b7ca@...cinc.com/t.mbox.gz
Checking for newer revisions
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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