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From: Lukasz Luba <l.luba@partner.samsung.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
	"linux-samsung-soc@vger.kernel.org"
	<linux-samsung-soc@vger.kernel.org>,
	"Bartłomiej Żołnierkiewicz" <b.zolnierkie@samsung.com>,
	sboyd@kernel.org, mturquette@baylibre.com,
	linux-kernel@vger.kernel.org, robh+dt@kernel.org,
	"Andrzej Hajda" <a.hajda@samsung.com>,
	"Chanwoo Choi" <cw00.choi@samsung.com>,
	kyungmin.park@samsung.com, kgene@kernel.org,
	myungjoo.ham@samsung.com, s.nawrocki@samsung.com,
	linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	"Marek Szyprowski" <m.szyprowski@samsung.com>
Subject: Re: [PATCH v1 20/50] ARM: dts: exynos: change and rename FSYS OPP table in Exynos5420
Date: Wed, 17 Jul 2019 12:04:45 +0200
Message-ID: <33804835-4003-b86d-62cf-3802fbb91202@partner.samsung.com> (raw)
In-Reply-To: <CAJKOXPfHgmBo9NX6jO8qSqXjN1pFmnKkQEWbou+q7-BDq2XKQg@mail.gmail.com>

Hi Krzysztof,

On 7/17/19 10:39 AM, Krzysztof Kozlowski wrote:
> On Mon, 15 Jul 2019 at 14:44, Lukasz Luba <l.luba@partner.samsung.com> wrote:
>>
>> The FSYS and FSYS2 buses have similar characteristics and both have max
>> frequency 240MHz. The old OPP table bus_fsys_apb_opp_table should be used
>> only to FSYS APB bus because APB max frequency is 200MHz.
>> The new OPPs for FSYS should increase its performance and related devices.
> 
> I do not understand the explanation. You say that there are two buses
> - FSYS and FSYS2 - and old OPP table should be used for FSYS APB but
> you remove the old one (by renaming). Or which one is the 'old one'
> here? The reason is speed... wait, what? Usually DTS should describe
> the HW so I imagine that proper opp table should be used for proper
> bus. It surprised me that we switch a bus to different OPP table just
> because of speed concerns. It should be correctness concern.
> 
> Please clarify and reword all this.
> 
> I am also not sure how this relates with previous patch - whether you
> are fixing independent issues. Maybe because I do not see the issue
> fixed... change the commit title and adjust the messages to focus WHY
> you are doing it. For small fixes WHAT you are doing is rather obvious
> so commit msg (and title) should not focus on it.

I don't know how familiar you are with AMBA standard or general concept
of NoC, so I am not sure if the explanation below would be sufficient.
There are 3 buses: FSYS, FSYS2, FSYS APB. The first two are connecting
AXI Slave/Master interfaces of the IP blocks. They are dedicated to
transfer the data i.e. to MMC block using 128 bit bus width and 240MHz
clock. The 3rd is dedicated for accessing peripheral registers -
connecting to IP block interfaces called APB3 slave.
As I mentioned in the comment the FSYS and FSYS2 are able to run faster
than the APB bus.
Thus, changing the old implementation which pinned FSYS and FSYS APB
to the same OPP table is wrong. The right connection made by OPP
reference should be FSYS and FSYS2 with also 240MHz max freq inside.

I have discussed offline with Bartek and I will squash DT patches to
an atomic-change-with-OPPs-and-PLL-rate-for-all-children, with more
detailed comment in the commit message describing the old state and the
new one.

Thank you for the review.

Regards,
Lukasz

> 
> Best regards,
> Krzysztof
> 
>>
>> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
>> ---
>>   arch/arm/boot/dts/exynos5420.dtsi | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
>> index 941c58bdd809..c7fc4b829b2a 100644
>> --- a/arch/arm/boot/dts/exynos5420.dtsi
>> +++ b/arch/arm/boot/dts/exynos5420.dtsi
>> @@ -995,7 +995,7 @@
>>                          compatible = "samsung,exynos-bus";
>>                          clocks = <&clock CLK_DOUT_ACLK200_FSYS>;
>>                          clock-names = "bus";
>> -                       operating-points-v2 = <&bus_fsys_apb_opp_table>;
>> +                       operating-points-v2 = <&bus_fsys_opp_table>;
>>                          status = "disabled";
>>                  };
>>
>> @@ -1003,7 +1003,7 @@
>>                          compatible = "samsung,exynos-bus";
>>                          clocks = <&clock CLK_DOUT_ACLK200_FSYS2>;
>>                          clock-names = "bus";
>> -                       operating-points-v2 = <&bus_fsys2_opp_table>;
>> +                       operating-points-v2 = <&bus_fsys_opp_table>;
>>                          status = "disabled";
>>                  };
>>
>> @@ -1157,7 +1157,7 @@
>>                          };
>>                  };
>>
>> -               bus_fsys2_opp_table: opp_table5 {
>> +               bus_fsys_opp_table: opp_table5 {
>>                          compatible = "operating-points-v2";
>>
>>                          opp00 {
>> --
>> 2.17.1
>>
> 
> 

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Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190715124433eucas1p2a292f236ea55751117836742c1ca5d23@eucas1p2.samsung.com>
2019-07-15 12:43 ` [PATCH v1 00/50] Exynos5x clocks and buses changes Lukasz Luba
     [not found]   ` <CGME20190715124434eucas1p273e2efaad8bc3904c6f76cc1671aeb6c@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 01/50] clk: samsung: add new IDs for Exynos5420 clocks Lukasz Luba
2019-07-16  9:49       ` Chanwoo Choi
2019-07-18  6:02         ` Lukasz Luba
     [not found]   ` <CGME20190715124435eucas1p2099cd7670a3d85d9b11eb0ff86041a2a@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 02/50] clk: samsung: add IDs for Exynos5420 NoC clocks Lukasz Luba
2019-07-16  9:26       ` Chanwoo Choi
2019-07-18  5:26         ` Lukasz Luba
     [not found]   ` <CGME20190715124436eucas1p28a581bc25f6dae52a5b9b1af26d26368@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 03/50] clk: samsung: change parent of dout_aclk400_wcore in Exynos5420 Lukasz Luba
2019-07-16  9:13       ` Chanwoo Choi
2019-07-18  5:19         ` Lukasz Luba
     [not found]   ` <CGME20190715124437eucas1p1827d7b5d7196f060799e5df6c27d29ad@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 04/50] clk: samsung: add IDs to manage aclk400_mscl " Lukasz Luba
2019-07-16  9:17       ` Chanwoo Choi
2019-07-18  5:21         ` Lukasz Luba
     [not found]   ` <CGME20190715124437eucas1p2d817f0c1fcf4b523c7910218a6e557d9@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 05/50] clk: samsung: add IDs to aclk400_isp " Lukasz Luba
     [not found]   ` <CGME20190715124438eucas1p2ee9d27c451eb7125bd3ec874baf76e14@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 06/50] clk: samsung: add IDs to ACLK266 clocks " Lukasz Luba
     [not found]   ` <CGME20190715124439eucas1p18c4f512d2647717d77666d94dca867a6@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 07/50] clk: samsung: add IDs to ACLK266_G2D " Lukasz Luba
     [not found]   ` <CGME20190715124440eucas1p10bb25e412f32f0da95761f96831893e6@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 08/50] clk: samsung: change aclk266_isp clocks definitions Exynos5420 Lukasz Luba
2019-07-16 10:22       ` Chanwoo Choi
2019-07-18  6:05         ` Lukasz Luba
     [not found]   ` <CGME20190715124441eucas1p12e1f58587318219a5a2c695faa200b17@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 09/50] clk: samsung: add IDs to FSYS clocks in Exynos5x Lukasz Luba
     [not found]   ` <CGME20190715124441eucas1p29f1205c20e9bea5b33f8f0b5747b1102@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 10/50] clk: samsung: change ACLK100_NOC clocks definitions Exynos5x Lukasz Luba
2019-07-16 10:01       ` Chanwoo Choi
     [not found]   ` <CGME20190715124442eucas1p197b23d50f6986477467d23f53b84d187@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 11/50] clk: samsung: add IDs to UART clocks in Exynos5420 Lukasz Luba
     [not found]   ` <CGME20190715124443eucas1p1adf02a02bf77448f2277ddd5fe5e895b@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 12/50] clk: add ID to PWM MUX " Lukasz Luba
     [not found]   ` <CGME20190715124444eucas1p2683c9896e8be45d6a0cd4afeb681a2ea@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 13/50] clk: samsung: add DPLL rate table " Lukasz Luba
2019-07-16  9:31       ` Chanwoo Choi
2019-07-18  6:01         ` Lukasz Luba
     [not found]   ` <CGME20190715124445eucas1p1a73385fcbe6205d868ae63b1198ff572@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 14/50] clk: samsung: add CLK_MOUT_SCLK_CPLL in the Exynos5420 Lukasz Luba
     [not found]   ` <CGME20190715124446eucas1p1de55fe42ed5555c7a09b10f8c3ec3c3e@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 15/50] clk: samsung: add MPLL rate table in Exynos5420 Lukasz Luba
     [not found]   ` <CGME20190715124446eucas1p1b9b7ec3235fdd887bf5a253a4e223df0@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 16/50] clk: samsung: add SPLL " Lukasz Luba
     [not found]   ` <CGME20190715124447eucas1p143a857f619f48b9b87437ec3b13dfb3f@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 17/50] clk: samsung: add CLK_MOUT_MMC0 in the Exynos5420 Lukasz Luba
     [not found]   ` <CGME20190715124448eucas1p1b3a8d16d6f5e9fd4ed49c3b7fa66e18e@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 18/50] ARM: dts: exynos: add bus_isp with OPP table Lukasz Luba
     [not found]   ` <CGME20190715124449eucas1p130d853368cb8bf02bef337da2d513fff@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 19/50] ARM: dts: exynos: change OPPs values for FSYS2 in Exynos5420 Lukasz Luba
     [not found]   ` <CGME20190715124450eucas1p189043d196375aa6adacf898de81bfa9b@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 20/50] ARM: dts: exynos: change and rename FSYS OPP table " Lukasz Luba
2019-07-17  8:39       ` Krzysztof Kozlowski
2019-07-17 10:04         ` Lukasz Luba [this message]
     [not found]   ` <CGME20190715124451eucas1p2904b49f59cca0cbbc22381f168affbb5@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 21/50] ARM: dts: exynos: add OPP into FSYS APB bus " Lukasz Luba
2019-07-17  8:48       ` Krzysztof Kozlowski
2019-07-22 10:47         ` Lukasz Luba
     [not found]   ` <CGME20190715124451eucas1p28ac87fa7bd7e602ffab69a6915f37536@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 22/50] ARM: dts: exynos: OPPs for bus_disp1 " Lukasz Luba
     [not found]   ` <CGME20190715124452eucas1p294d89255359b2036b19213427f558dbf@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 23/50] ARM: dts: exynos: change lowest OPP in bus_disp1_fimd " Lukasz Luba
2019-07-17  9:08       ` Krzysztof Kozlowski
     [not found]   ` <CGME20190715124453eucas1p1dbdfab862499d9a7bd8a853e30944bac@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 24/50] ARM: dts: exynos: align OPPs with PLL rate for MSCL " Lukasz Luba
     [not found]   ` <CGME20190715124454eucas1p1cd37552b222539b02629cb52e646ae29@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 25/50] ARM: dts: exynos: add 300MHz to bus_disp1_fimd " Lukasz Luba
2019-07-17 10:04       ` Krzysztof Kozlowski
     [not found]   ` <CGME20190715124455eucas1p13bfc0c1d113225db9607e4c0dbac353c@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 26/50] ARM: dts: exynos: align NOC100 bus OPPs " Lukasz Luba
2019-07-17 10:10       ` Krzysztof Kozlowski
2019-07-17 10:27         ` Lukasz Luba
2019-07-17 10:38           ` Krzysztof Kozlowski
2019-07-17 10:41             ` Lukasz Luba
     [not found]   ` <CGME20190715124456eucas1p2acf15d00e3fa7b77fe3a2b10ce1ab74f@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 27/50] ARM: dts: exynos: align bus_wcore " Lukasz Luba
2019-07-17 10:15       ` Krzysztof Kozlowski
2019-07-17 10:29         ` Lukasz Luba
2019-07-17 16:58         ` Lukasz Luba
2019-07-23 12:08           ` Krzysztof Kozlowski
     [not found]   ` <CGME20190715124457eucas1p1b3033c2505581b350191eed7ba47bb40@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 28/50] ARM: dts: exynos: change OPPs for g2d and g2d_acp buses " Lukasz Luba
     [not found]   ` <CGME20190715124457eucas1p20401b92a7c0eb51af1e0910fbebaa0b5@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 29/50] ARM: dts: exynos: align OPPs of bus_gen " Lukasz Luba
     [not found]   ` <CGME20190715124458eucas1p2df56f2e0c7a1a0a9144a4d5fbdb471a9@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 30/50] ARM: dts: exynos: add bus_isp266 into Exynos5800 Lukasz Luba
2019-07-17 10:33       ` Krzysztof Kozlowski
     [not found]   ` <CGME20190715124459eucas1p2a1d8795e57a82704ff221567a8810485@eucas1p2.samsung.com>
2019-07-15 12:43     ` [PATCH v1 31/50] ARM: dts: exynos: align lowest OPP in bus_jpeg in Exynos5420 Lukasz Luba
2019-07-17 10:30       ` Krzysztof Kozlowski
     [not found]   ` <CGME20190715124500eucas1p114c6cbbbb4efa421b2e24d49a6d3d603@eucas1p1.samsung.com>
2019-07-15 12:43     ` [PATCH v1 32/50] ARM: dts: exynos: remove lowest OPP from bus_mfc " Lukasz Luba
     [not found]   ` <CGME20190715124501eucas1p17382ca9cead8bfe1dc938e6fb583b7c5@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 33/50] ARM: dts: exynos: set parent clocks to UARTs " Lukasz Luba
2019-07-17 10:35       ` Krzysztof Kozlowski
     [not found]   ` <CGME20190715124502eucas1p20a35f8c0f426878e50583fa3402de988@eucas1p2.samsung.com>
2019-07-15 12:44     ` [PATCH v1 34/50] ARM: dts: exynos: set parent clocks to PWM " Lukasz Luba
     [not found]   ` <CGME20190715124502eucas1p1b795c100232b405070f4700e3ca6130b@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 35/50] ARM: dts: exynos: change speed and parent of NoC clock " Lukasz Luba
     [not found]   ` <CGME20190715124503eucas1p1d41112e5c10c4fd21c7aada7bdf8e513@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 36/50] ARM: dts: exynos: change ACLK100_NOC config in Exynos5422 Lukasz Luba
     [not found]   ` <CGME20190715124504eucas1p1afe0da2c6ac3a8b45d85017a77ba9edf@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 37/50] ARM: dts: exynos: change parent and rate of bus_fsys " Lukasz Luba
2019-07-17 10:25       ` Krzysztof Kozlowski
2019-07-17 10:38         ` Lukasz Luba
2019-07-17 10:45           ` Krzysztof Kozlowski
2019-07-17 11:05             ` Lukasz Luba
2019-07-17 11:11               ` Krzysztof Kozlowski
2019-07-17 12:55                 ` Lukasz Luba
2019-07-23 12:06                   ` Krzysztof Kozlowski
     [not found]   ` <CGME20190715124505eucas1p14e68a537cb53cda2cfd832e59425cd25@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 38/50] ARM: dts: exynos: change parent and rate of bus_fsys2 " Lukasz Luba
     [not found]   ` <CGME20190715124506eucas1p2b4e906a88978e3edd875e92b1a9fedc4@eucas1p2.samsung.com>
2019-07-15 12:44     ` [PATCH v1 39/50] ARM: dts: exynos: change parent and rate of bus_fsys_acp " Lukasz Luba
     [not found]   ` <CGME20190715124507eucas1p17793ab35cd6a64fc5626b751e7f095ee@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 40/50] ARM: dts: exynos: change parent and rate of bus_gen " Lukasz Luba
     [not found]   ` <CGME20190715124508eucas1p2b66d72b7eadd7428063387c6881aca64@eucas1p2.samsung.com>
2019-07-15 12:44     ` [PATCH v1 41/50] ARM: dts: exynos: change parent and rate of bus_g2d " Lukasz Luba
     [not found]   ` <CGME20190715124508eucas1p2f2e09e296dd4ad97a52a2023ede8ae98@eucas1p2.samsung.com>
2019-07-15 12:44     ` [PATCH v1 42/50] ARM: dts: exynos: change parent and rate of bus_mscl " Lukasz Luba
     [not found]   ` <CGME20190715124509eucas1p1f2e44af951158fbef1a245467956ef93@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 43/50] ARM: dts: exynos: add bus_isp " Lukasz Luba
2019-07-17 10:02       ` Krzysztof Kozlowski
2019-07-17 10:12         ` Lukasz Luba
     [not found]   ` <CGME20190715124510eucas1p1a88fcaa3b6175a5dae69e6879a534746@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 44/50] ARM: dts: exynos: change rate of bus_jpeg " Lukasz Luba
     [not found]   ` <CGME20190715124511eucas1p2b11ef3a5bc093e686ae5450d16785225@eucas1p2.samsung.com>
2019-07-15 12:44     ` [PATCH v1 45/50] ARM: dts: exynos: change rate of bus_disp1_fimd " Lukasz Luba
     [not found]   ` <CGME20190715124512eucas1p1bd847805f945ada00f2b7952592cc104@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 46/50] ARM: dts: exynos: change rates of bus_disp1 " Lukasz Luba
     [not found]   ` <CGME20190715124513eucas1p2c30a951141622994d350df5e61fdaed4@eucas1p2.samsung.com>
2019-07-15 12:44     ` [PATCH v1 47/50] ARM: dts: exynos: change rate of bus_gscl_scaler " Lukasz Luba
     [not found]   ` <CGME20190715124514eucas1p1531a88cfb9b4e2fdb801074963372688@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 48/50] ARM: dts: exynos: set proper parents to bus_isp266 Exynos5422 Lukasz Luba
     [not found]   ` <CGME20190715124514eucas1p1dcbbcbac0503980825d5e4ebae32003b@eucas1p1.samsung.com>
2019-07-15 12:44     ` [PATCH v1 49/50] ARM: dts: exynos: add buses support for Exynos5800 Peach Pi Lukasz Luba
     [not found]   ` <CGME20190715124515eucas1p240a8c61dd62d56cbbd0e4d313be2273e@eucas1p2.samsung.com>
2019-07-15 12:44     ` [PATCH v1 50/50] ARM: dts: exynos: change MMC0 clock parent in " Lukasz Luba

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    --cc=m.szyprowski@samsung.com \
    --cc=mark.rutland@arm.com \
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    --cc=sboyd@kernel.org \
    /path/to/YOUR_REPLY

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Linux-ARM-Kernel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/0 linux-arm-kernel/git/0.git
	git clone --mirror https://lore.kernel.org/linux-arm-kernel/1 linux-arm-kernel/git/1.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-arm-kernel linux-arm-kernel/ https://lore.kernel.org/linux-arm-kernel \
		linux-arm-kernel@lists.infradead.org infradead-linux-arm-kernel@archiver.kernel.org
	public-inbox-index linux-arm-kernel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-arm-kernel


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