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

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Message-ID: <b4e25dd2-caf3-48f0-8e1b-622f3db1b7ca@quicinc.com>
Date: Thu, 18 Sep 2025 18:21:23 +0800
From: Renjiang Han <quic_renjiang@...cinc.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>, <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 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@quicinc.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
>
-- 
Best Regards,
Renjiang