Linux-SPI Archive on lore.kernel.org
 help / color / Atom feed
From: Evan Green <evgreen@chromium.org>
To: Akash Asthana <akashast@codeaurora.org>
Cc: 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,
	Matthias Kaehlcke <mka@chromium.org>,
	Doug Anderson <dianders@chromium.org>
Subject: Re: [PATCH V2 2/8] soc: qcom: geni: Support for ICC voting
Date: Tue, 17 Mar 2020 12:06:31 -0700
Message-ID: <CAE=gft4_Su4+SXWAW_HWy5BF1mH7QaDHCiwAAhrNaekTeU57rA@mail.gmail.com> (raw)
In-Reply-To: <1584105134-13583-3-git-send-email-akashast@codeaurora.org>

On Fri, Mar 13, 2020 at 6:12 AM Akash Asthana <akashast@codeaurora.org> 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
>
>  include/linux/qcom-geni-se.h | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
>
> diff --git a/include/linux/qcom-geni-se.h b/include/linux/qcom-geni-se.h
> index dd46494..eaae16e 100644
> --- a/include/linux/qcom-geni-se.h
> +++ b/include/linux/qcom-geni-se.h
> @@ -6,6 +6,8 @@
>  #ifndef _LINUX_QCOM_GENI_SE
>  #define _LINUX_QCOM_GENI_SE
>
> +#include <linux/interconnect.h>
> +
>  /* Transfer mode supported by GENI Serial Engines */
>  enum geni_se_xfer_mode {
>         GENI_SE_INVALID,
> @@ -33,6 +35,15 @@ struct clk;
>   * @clk:               Handle to the core serial engine clock
>   * @num_clk_levels:    Number of valid clock levels in clk_perf_tbl
>   * @clk_perf_tbl:      Table of clock frequency input to serial engine clock
> + * @icc_path_geni_to_core:     ICC path handle for geni to core
> + * @icc_path_cpu_to_geni:      ICC path handle for cpu to geni
> + * @icc_path_geni_to_ddr:      ICC path handle for geni to ddr
> + * @avg_bw_core:       Average bus bandwidth value for QUP core 2x clock
> + * @peak_bw_core:      Peak bus bandwidth value for QUP core 2x clock
> + * @avg_bw_cpu:                Average bus bandwidth value for CPU
> + * @peak_bw_cpu:       Peak bus bandwidth value for CPU
> + * @avg_bw_ddr:                Average bus bandwidth value for DDR
> + * @peak_bw_ddr:       Peak bus bandwidth value for DDR
>   */
>  struct geni_se {
>         void __iomem *base;
> @@ -41,6 +52,15 @@ struct geni_se {
>         struct clk *clk;
>         unsigned int num_clk_levels;
>         unsigned long *clk_perf_tbl;
> +       struct icc_path *icc_path_geni_to_core;
> +       struct icc_path *icc_path_cpu_to_geni;
> +       struct icc_path *icc_path_geni_to_ddr;
> +       unsigned int avg_bw_core;
> +       unsigned int peak_bw_core;
> +       unsigned int avg_bw_cpu;
> +       unsigned int peak_bw_cpu;
> +       unsigned int avg_bw_ddr;
> +       unsigned int peak_bw_ddr;
>  };
>
>  /* Common SE registers */
> @@ -229,6 +249,14 @@ struct geni_se {
>  #define GENI_SE_VERSION_MINOR(ver) ((ver & HW_VER_MINOR_MASK) >> HW_VER_MINOR_SHFT)
>  #define GENI_SE_VERSION_STEP(ver) (ver & HW_VER_STEP_MASK)
>
> +/* Core 2X clock frequency to BCM threshold mapping */
> +#define CORE_2X_19_2_MHZ               960
> +#define CORE_2X_50_MHZ                 2500
> +#define CORE_2X_100_MHZ                        5000
> +#define CORE_2X_150_MHZ                        7500
> +#define CORE_2X_200_MHZ                        10000
> +#define CORE_2X_236_MHZ                        16383

These are all just 50 * clock_rate. Can you instead specify that one
define of CLK_TO_BW_RATIO 50, and then use clk_get_rate() to get the
input clock frequency. That way, if these end up getting clocked at a
different rate, the bandwidth also scales appropriately. Also, can you
enumerate why 50 is an appropriate ratio?
-Evan

-Evan

  parent reply index

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
     [not found] ` <1584105134-13583-1-git-send-email-akashast-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
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 4/8] tty: serial: qcom_geni_serial: Add interconnect support Akash Asthana
     [not found]     ` <1584105134-13583-5-git-send-email-akashast-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2020-03-13 21:28       ` Matthias Kaehlcke
     [not found]         ` <20200313212833.GK144492-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-03-17 11:48           ` Akash Asthana
2020-03-17 19:08             ` Matthias Kaehlcke
2020-03-18 12:23               ` Akash Asthana
     [not found]                 ` <e95bd6e0-d1fd-9d13-47df-f7d08b443e37-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2020-03-19 20:42                   ` Matthias Kaehlcke
     [not found]                     ` <20200319204248.GA204494-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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
     [not found]     ` <1584105134-13583-7-git-send-email-akashast-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2020-03-13 13:16       ` Mark Brown
2020-03-17  9:35         ` Akash Asthana
     [not found]           ` <aa197568-3bac-6962-d39d-3261f68c0514-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2020-03-17 13:06             ` Mark Brown
2020-03-20 13:52               ` Akash Asthana
2020-03-14  0:41     ` Matthias Kaehlcke
     [not found]       ` <20200314004106.GM144492-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-03-17 12:11         ` Akash Asthana
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
     [not found]     ` <20200313164207.GH144492-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-03-17  9:58       ` Akash Asthana
2020-03-17 19:06   ` Evan Green [this message]
     [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
     [not found]     ` <20200313204441.GJ144492-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-03-17 10:57       ` Akash Asthana
     [not found]         ` <1f86fdf0-df7c-4e4a-d4d8-8b0162e52cb4-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2020-03-17 18:29           ` Matthias Kaehlcke
2020-03-18  8:54             ` Akash Asthana
2020-03-19 19:43               ` Matthias Kaehlcke
     [not found]                 ` <20200319194332.GA60149-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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
     [not found]             ` <CAE=gft5GcOeQ5kh1bGen_P0J98g2XaAJ7NrDsxkirDoLtL4GWg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-03-18 10:57               ` Akash Asthana
2020-03-18 16:22                 ` Evan Green
2020-03-13 13:12 ` [PATCH V2 7/8] spi: spi-qcom-qspi: Add interconnect support Akash Asthana
2020-03-14  0:58   ` Matthias Kaehlcke
     [not found]     ` <20200314005817.GN144492-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-03-17 12:13       ` Akash Asthana
2020-03-17 19:08         ` Evan Green
2020-03-18 13:48           ` Akash Asthana
     [not found]             ` <e2ee1a60-a379-5c78-355a-64aad451a944-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAE=gft4_Su4+SXWAW_HWy5BF1mH7QaDHCiwAAhrNaekTeU57rA@mail.gmail.com' \
    --to=evgreen@chromium.org \
    --cc=agross@kernel.org \
    --cc=akashast@codeaurora.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=broonie@kernel.org \
    --cc=devicetree@vger.kernel.org \
    --cc=dianders@chromium.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-i2c@vger.kernel.org \
    --cc=linux-serial@vger.kernel.org \
    --cc=linux-spi@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mgautam@codeaurora.org \
    --cc=mka@chromium.org \
    --cc=robh+dt@kernel.org \
    --cc=swboyd@chromium.org \
    --cc=wsa@the-dreams.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-SPI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-spi/0 linux-spi/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-spi linux-spi/ https://lore.kernel.org/linux-spi \
		linux-spi@vger.kernel.org
	public-inbox-index linux-spi

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-spi


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git