From: Akash Asthana <akashast@codeaurora.org>
To: Matthias Kaehlcke <mka@chromium.org>
Cc: gregkh@linuxfoundation.org, agross@kernel.org,
bjorn.andersson@linaro.org, wsa@the-dreams.de,
broonie@kernel.org, mark.rutland@arm.com, robh+dt@kernel.org,
linux-i2c@vger.kernel.org, linux-spi@vger.kernel.org,
devicetree@vger.kernel.org, swboyd@chromium.org,
mgautam@codeaurora.org, linux-arm-msm@vger.kernel.org,
linux-serial@vger.kernel.org, dianders@chromium.org,
evgreen@chromium.org, georgi.djakov@linaro.org
Subject: Re: [PATCH V5 1/7] soc: qcom: geni: Support for ICC voting
Date: Tue, 12 May 2020 19:56:05 +0530 [thread overview]
Message-ID: <adacee1f-41b3-140a-d72a-4df3c42dd2fa@codeaurora.org> (raw)
In-Reply-To: <20200508190301.GG4525@google.com>
Hi Matthias,
On 5/9/2020 12:33 AM, Matthias Kaehlcke wrote:
> On Fri, May 08, 2020 at 12:03:33PM +0530, Akash Asthana wrote:
>> Add necessary macros and structure variables to support ICC BW
>> voting from individual SE drivers.
>>
>> Signed-off-by: Akash Asthana <akashast@codeaurora.org>
>> ---
>> Changes in V2:
>> - As per Bjorn's comment dropped enums for ICC paths, given the three
>> paths individual members
>>
>> Changes in V3:
>> - Add geni_icc_get, geni_icc_vote_on and geni_icc_vote_off as helper API.
>> - Add geni_icc_path structure in common header
>>
>> Changes in V4:
>> - As per Bjorn's comment print error message in geni_icc_get if return
>> value is not -EPROBE_DEFER.
>> - As per Bjorn's comment remove NULL on path before calling icc_set_bw
>> API.
>> - As per Bjorn's comment drop __func__ print.
>> - As per Matthias's comment, make ICC path a array instead of individual
>> member entry in geni_se struct.
>>
>> Note: I have ignored below check patch suggestion because it was throwing
>> compilation error as 'icc_ddr' is not compile time comstant.
>>
>> WARNING: char * array declaration might be better as static const
>> - FILE: drivers/soc/qcom/qcom-geni-se.c:726:
>> - const char *icc_names[] = {"qup-core", "qup-config", icc_ddr};
>>
>> Changes in V5:
>> - As per Matthias's comment defined enums for ICC paths.
>> - Integrate icc_enable/disable with power on/off call for driver.
>> - As per Matthias's comment added icc_path_names array to print icc path name
>> in failure case.
>> - As per Georgi's suggestion assume peak_bw = avg_bw if not mentioned.
>>
>> drivers/soc/qcom/qcom-geni-se.c | 92 +++++++++++++++++++++++++++++++++++++++++
>> include/linux/qcom-geni-se.h | 42 +++++++++++++++++++
>> 2 files changed, 134 insertions(+)
>>
>> diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
>> index 7d622ea..63403bf 100644
>> --- a/drivers/soc/qcom/qcom-geni-se.c
>> +++ b/drivers/soc/qcom/qcom-geni-se.c
>> @@ -92,6 +92,9 @@ struct geni_wrapper {
>> struct clk_bulk_data ahb_clks[NUM_AHB_CLKS];
>> };
>>
>> +static const char * const icc_path_names[] = {"qup-core", "qup-config",
>> + "qup-memory"};
>> +
>> #define QUP_HW_VER_REG 0x4
>>
>> /* Common SE registers */
>> @@ -720,6 +723,95 @@ void geni_se_rx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
>> }
>> EXPORT_SYMBOL(geni_se_rx_dma_unprep);
>>
>> +int geni_icc_get(struct geni_se *se, const char *icc_ddr)
>> +{
>> + int i, icc_err;
>> + const char *icc_names[] = {"qup-core", "qup-config", icc_ddr};
>> +
>> + for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
>> + if (!icc_names[i])
>> + continue;
>> +
>> + se->icc_paths[i].path = devm_of_icc_get(se->dev, icc_names[i]);
>> + if (IS_ERR(se->icc_paths[i].path))
>> + goto icc_get_failure;
>> + }
>> +
>> + return 0;
>> +
>> +icc_get_failure:
>> + icc_err = PTR_ERR(se->icc_paths[i].path);
>> + if (icc_err != -EPROBE_DEFER)
>> + dev_err_ratelimited(se->dev, "Failed to get ICC path:%s, ret:%d\n",
>> + icc_names[i], icc_err);
>> + return icc_err;
>> +
>> +}
>> +EXPORT_SYMBOL(geni_icc_get);
>> +
>> +void geni_icc_bw_init(struct geni_icc_path *icc_paths, unsigned int avg_bw,
>> + unsigned int peak_bw)
> I noticed that all callers of geni_icc_bw_init() pass 0 as
> 'peak_pw' (aka peak == avg). Unless there are plans to use other
> values for the peak bandwidth in the future it is pointless to
> track the bandwidth(s) in two variables. And if the bandwidth is
> tracked in a single variable this function is not needed.
As of now we are not aware of our peak requirement(avg requirement works
good for us) so I am passing (peak = avg) as per Georgi's suggestion.
But I wanted to make this feature more generic and keeping the
possibilty open that we might have to use other peak(!=0) value in future.
Regards,
Akash
>
>> +{
>> + if (!peak_bw)
>> + peak_bw = avg_bw;
>> + icc_paths->avg_bw = avg_bw;
>> + icc_paths->peak_bw = peak_bw;
>> +}
>> +EXPORT_SYMBOL(geni_icc_bw_init);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-05-12 14:26 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 6:33 [PATCH V5 0/7] Add interconnect support to QSPI and QUP drivers Akash Asthana
2020-05-08 6:33 ` [PATCH V5 1/7] soc: qcom: geni: Support for ICC voting Akash Asthana
2020-05-08 17:13 ` Matthias Kaehlcke
2020-05-12 14:02 ` Akash Asthana
2020-05-08 19:03 ` Matthias Kaehlcke
2020-05-12 14:26 ` Akash Asthana [this message]
2020-05-08 6:33 ` [PATCH V5 2/7] soc: qcom-geni-se: Add interconnect support to fix earlycon crash Akash Asthana
2020-05-08 17:59 ` Matthias Kaehlcke
2020-05-08 19:14 ` Matthias Kaehlcke
2020-05-14 7:03 ` Akash Asthana
2020-05-14 6:45 ` Akash Asthana
2020-05-09 12:11 ` Andy Shevchenko
2020-05-14 7:34 ` Akash Asthana
2020-05-08 6:33 ` [PATCH V5 3/7] i2c: i2c-qcom-geni: Add interconnect support Akash Asthana
2020-05-08 18:16 ` Matthias Kaehlcke
2020-05-15 10:03 ` Wolfram Sang
2020-05-08 6:33 ` [PATCH V5 4/7] spi: spi-geni-qcom: " Akash Asthana
2020-05-08 10:16 ` Mark Brown
2020-05-08 18:25 ` Matthias Kaehlcke
2020-05-14 7:37 ` Akash Asthana
2020-05-08 6:33 ` [PATCH V5 5/7] tty: serial: qcom_geni_serial: " Akash Asthana
2020-05-08 18:38 ` Matthias Kaehlcke
2020-05-08 6:33 ` [PATCH V5 6/7] spi: spi-qcom-qspi: " Akash Asthana
2020-05-08 10:16 ` Mark Brown
2020-05-08 18:53 ` Matthias Kaehlcke
2020-05-18 13:10 ` Akash Asthana
2020-05-08 6:33 ` [PATCH V5 7/7] arm64: dts: sc7180: Add interconnect for QUP and QSPI Akash Asthana
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