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SubjectRe: [PATCH 06/20] interconnect: qcom: icc-rpm: Allow negative QoS offset
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On 01/06/2023 12:59, Konrad Dybcio wrote:
>
>
> On 1.06.2023 11:56, Dmitry Baryshkov wrote:
>> On 30/05/2023 13:20, Konrad Dybcio wrote:
>>> In some very very very very unfortunate cases, the correct offset of
>>> the QoS registers will be.. negative. One such case is MSM8998, where
>>> The DDR BWMON occupies what-would-be-the-BIMC-base which we usually
>>> take into account with the register calculation, making the actual
>>> BIMC node start at what-would-be-the-BIMC-base+0x300.
>>
>> Can we turn one of devices into a child of another device? This way we won't have to cope with negative offsets.
> Let's try to get more insight how they're correlated, but that sounds
> like an option.. 8996 will need this as well..

Anyway, I think this commit should be moved closer to the actual use.

>
> Konrad
>>
>>>
>>> In order to keep the calculation code sane, the simplest - however
>>> ugly it may be - solution is to allow the offset to be negative.
>>>
>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
>>> ---
>>>   drivers/interconnect/qcom/icc-rpm.h | 6 +++---
>>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
>>> index d2c04c400cad..ba840a436cc0 100644
>>> --- a/drivers/interconnect/qcom/icc-rpm.h
>>> +++ b/drivers/interconnect/qcom/icc-rpm.h
>>> @@ -29,10 +29,10 @@ enum qcom_icc_type {
>>>    * @num_intf_clks: the total number of intf_clks clk_bulk_data entries
>>>    * @type: the ICC provider type
>>>    * @regmap: regmap for QoS registers read/write access
>>> - * @qos_offset: offset to QoS registers
>>>    * @bus_clk_rate: bus clock rate in Hz
>>>    * @bus_clks: the clk_bulk_data table of bus clocks
>>>    * @intf_clks: a clk_bulk_data array of interface clocks
>>> + * @qos_offset: offset to QoS registers
>>
>> This can be kept in place.
>>
>>>    * @keep_alive: whether to always keep a minimum vote on the bus clocks
>>>    * @is_on: whether the bus is powered on
>>>    */
>>> @@ -42,7 +42,7 @@ struct qcom_icc_provider {
>>>       int num_intf_clks;
>>>       enum qcom_icc_type type;
>>>       struct regmap *regmap;
>>> -    unsigned int qos_offset;
>>> +    int qos_offset;
>>>       u64 bus_clk_rate[NUM_BUS_CLKS];
>>>       struct clk_bulk_data bus_clks[NUM_BUS_CLKS];
>>>       struct clk_bulk_data *intf_clks;
>>> @@ -108,7 +108,7 @@ struct qcom_icc_desc {
>>>       bool no_clk_scaling;
>>>       enum qcom_icc_type type;
>>>       const struct regmap_config *regmap_cfg;
>>> -    unsigned int qos_offset;
>>> +    int qos_offset;
>>>   };
>>>     /* Valid for all bus types */
>>>
>>

--
With best wishes
Dmitry

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