From: Akash Asthana <akashast@codeaurora.org>
To: Evan Green <evgreen@chromium.org>
Cc: Matthias Kaehlcke <mka@chromium.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
wsa@the-dreams.de, Mark Brown <broonie@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Rob Herring <robh+dt@kernel.org>,
linux-i2c@vger.kernel.org, linux-spi@vger.kernel.org,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>, Stephen Boyd <swboyd@chromium.org>,
Manu Gautam <mgautam@codeaurora.org>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
linux-serial@vger.kernel.org,
Doug Anderson <dianders@chromium.org>,
Georgi Djakov <georgi.djakov@linaro.org>
Subject: Re: [PATCH V2 7/8] spi: spi-qcom-qspi: Add interconnect support
Date: Wed, 18 Mar 2020 19:18:07 +0530 [thread overview]
Message-ID: <e2ee1a60-a379-5c78-355a-64aad451a944@codeaurora.org> (raw)
In-Reply-To: <CAE=gft58QsgTCUHMHKJhcM9ZxAeMiY16CrbNv2HaTCRqwtmt7A@mail.gmail.com>
Hi Evan,
On 3/18/2020 12:38 AM, Evan Green wrote:
> On Tue, Mar 17, 2020 at 5:13 AM Akash Asthana <akashast@codeaurora.org> wrote:
>> Hi Matthias,
>>
>> On 3/14/2020 6:28 AM, Matthias Kaehlcke wrote:
>>> Hi,
>>>
>>> On Fri, Mar 13, 2020 at 06:42:13PM +0530, Akash Asthana wrote:
>>>> Get the interconnect paths for QSPI device and vote according to the
>>>> current bus speed of the driver.
>>>>
>>>> Signed-off-by: Akash Asthana <akashast@codeaurora.org>
>>>> ---
>>>> - As per Bjorn's comment, introduced and using devm_of_icc_get API for getting
>>>> path handle
>>>> - As per Matthias comment, added error handling for icc_set_bw call
>>>>
>>>> drivers/spi/spi-qcom-qspi.c | 46 ++++++++++++++++++++++++++++++++++++++++++++-
>>>> 1 file changed, 45 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
>>>> index 3c4f83b..ad48f43 100644
>>>> --- a/drivers/spi/spi-qcom-qspi.c
>>>> +++ b/drivers/spi/spi-qcom-qspi.c
>>>> @@ -2,6 +2,7 @@
>>>> // Copyright (c) 2017-2018, The Linux foundation. All rights reserved.
>>>>
>>>> #include <linux/clk.h>
>>>> +#include <linux/interconnect.h>
>>>> #include <linux/interrupt.h>
>>>> #include <linux/io.h>
>>>> #include <linux/module.h>
>>>> @@ -139,7 +140,10 @@ struct qcom_qspi {
>>>> struct device *dev;
>>>> struct clk_bulk_data *clks;
>>>> struct qspi_xfer xfer;
>>>> - /* Lock to protect xfer and IRQ accessed registers */
>>>> + struct icc_path *icc_path_cpu_to_qspi;
>>>> + unsigned int avg_bw_cpu;
>>>> + unsigned int peak_bw_cpu;
>>> This triplet is a recurring pattern, and is probably not limited to geni SE/QSPI.
>>> On https://patchwork.kernel.org/patch/11436889/#23221925 I suggested the creation
>>> of a geni SE specific struct, however adding a generic convenience struct to
>>> 'linux/interconnect.h' might be the better solution:
>>>
>>> struct icc_client {
>>> struct icc_path *path;
>>> unsigned int avg_bw;
>>> unsigned int peak_bw;
>>> };
>>>
>>> I'm sure there are better names for it, but this would be the idea.
>> Yeah, I think introducing this to ICC header would be better solution.
> +Georgi
>
> I'm not as convinced this structure is generally useful and belongs in
> the interconnect core. The thing that strikes me as weird with putting
> it in the core is now we're saving these values both inside and
> outside the interconnect core.
IIUC, you meant to say struct icc_req(inside icc_path) will be saving
avg_bw and peak_bw so no need to save it outside icc_path?
> In the GENI case here, we only really
> need them to undo the 0 votes we cast during suspend. If "vote for 0
> in suspend and whatever it was before at resume" is a recurring theme,
> maybe the core should give us path_disable() and path_enable() calls
> instead. I'm thinking out loud, maybe Georgi has some thoughts.
>
> Akash, for now if you want to avoid wading into a larger discussion
> maybe just refactor to a common structure local to GENI.
Ok
Thanks,
Akash
>
>
> -Evan
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-03-18 13:48 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-13 13:12 [PATCH V2 0/8] Add interconnect support to QSPI and QUP drivers Akash Asthana
2020-03-13 13:12 ` [PATCH V2 1/8] interconnect: Add devm_of_icc_get() as exported API for users Akash Asthana
2020-03-13 16:26 ` Matthias Kaehlcke
2020-03-27 23:02 ` Bjorn Andersson
2020-03-13 13:12 ` [PATCH V2 2/8] soc: qcom: geni: Support for ICC voting Akash Asthana
2020-03-13 16:42 ` Matthias Kaehlcke
2020-03-17 9:58 ` Akash Asthana
2020-03-17 19:06 ` Evan Green
[not found] ` <74851dda-296d-cdc5-2449-b9ec59bbc057@codeaurora.org>
2020-03-20 16:45 ` Evan Green
2020-03-27 5:33 ` Akash Asthana
2020-03-13 13:12 ` [PATCH V2 3/8] soc: qcom-geni-se: Add interconnect support to fix earlycon crash Akash Asthana
2020-03-13 20:44 ` Matthias Kaehlcke
2020-03-17 10:57 ` Akash Asthana
2020-03-17 18:29 ` Matthias Kaehlcke
2020-03-18 8:54 ` Akash Asthana
2020-03-19 19:43 ` Matthias Kaehlcke
2020-03-20 10:22 ` Akash Asthana
2020-03-20 16:30 ` Evan Green
2020-03-27 5:04 ` Akash Asthana
2020-03-27 23:23 ` Bjorn Andersson
2020-03-31 10:55 ` Akash Asthana
2020-03-17 19:08 ` Evan Green
2020-03-17 19:46 ` Doug Anderson
2020-03-18 10:57 ` Akash Asthana
2020-03-18 16:22 ` Evan Green
2020-03-13 13:12 ` [PATCH V2 4/8] tty: serial: qcom_geni_serial: Add interconnect support Akash Asthana
2020-03-13 21:28 ` Matthias Kaehlcke
2020-03-17 11:48 ` Akash Asthana
2020-03-17 19:08 ` Matthias Kaehlcke
2020-03-18 12:23 ` Akash Asthana
2020-03-19 20:42 ` Matthias Kaehlcke
2020-03-20 10:35 ` Akash Asthana
2020-03-13 13:12 ` [PATCH V2 5/8] i2c: i2c-qcom-geni: " Akash Asthana
2020-03-14 0:17 ` Matthias Kaehlcke
2020-03-17 11:51 ` Akash Asthana
2020-03-13 13:12 ` [PATCH V2 6/8] spi: spi-geni-qcom: " Akash Asthana
2020-03-13 13:16 ` Mark Brown
2020-03-17 9:35 ` Akash Asthana
2020-03-17 13:06 ` Mark Brown
2020-03-20 13:52 ` Akash Asthana
2020-03-14 0:41 ` Matthias Kaehlcke
2020-03-17 12:11 ` Akash Asthana
2020-03-13 13:12 ` [PATCH V2 7/8] spi: spi-qcom-qspi: " Akash Asthana
2020-03-14 0:58 ` Matthias Kaehlcke
2020-03-17 12:13 ` Akash Asthana
2020-03-17 19:08 ` Evan Green
2020-03-18 13:48 ` Akash Asthana [this message]
2020-03-18 16:30 ` Evan Green
2020-03-20 5:35 ` Akash Asthana
2020-03-13 13:12 ` [PATCH V2 8/8] arm64: dts: sc7180: Add interconnect for QUP and QSPI Akash Asthana
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