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[109.252.193.186]) by smtp.googlemail.com with ESMTPSA id t66sm241138lff.85.2020.10.27.13.16.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Oct 2020 13:16:30 -0700 (PDT) Subject: Re: [PATCH v6 13/52] dt-bindings: memory: tegra124: emc: Document new interconnect property To: Krzysztof Kozlowski Cc: Thierry Reding , Jonathan Hunter , Georgi Djakov , Rob Herring , Michael Turquette , Stephen Boyd , Peter De Schrijver , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Mikko Perttunen , Viresh Kumar , Peter Geis , Nicolas Chauvet , linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org References: <20201025221735.3062-1-digetx@gmail.com> <20201025221735.3062-14-digetx@gmail.com> <20201027102506.GB17089@kozik-lap> <20201027194833.GE140636@kozik-lap> From: Dmitry Osipenko Message-ID: <0a7aeebf-c5ab-13ea-3927-fa39512afd87@gmail.com> Date: Tue, 27 Oct 2020 23:16:29 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201027194833.GE140636@kozik-lap> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org 27.10.2020 22:48, Krzysztof Kozlowski пишет: > On Tue, Oct 27, 2020 at 10:19:28PM +0300, Dmitry Osipenko wrote: >> 27.10.2020 13:25, Krzysztof Kozlowski пишет: >>> On Mon, Oct 26, 2020 at 01:16:56AM +0300, Dmitry Osipenko wrote: >>>> External memory controller is interconnected with memory controller and >>>> with external memory. Document new interconnect property which turns >>>> External Memory Controller into interconnect provider. >>>> >>>> Signed-off-by: Dmitry Osipenko >>>> --- >>>> .../bindings/memory-controllers/nvidia,tegra124-emc.yaml | 7 +++++++ >>>> 1 file changed, 7 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml >>>> index 278549f9e051..ac00832ceac1 100644 >>>> --- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml >>>> +++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra124-emc.yaml >>>> @@ -29,6 +29,9 @@ properties: >>>> items: >>>> - const: emc >>>> >>>> + "#interconnect-cells": >>>> + const: 0 >>>> + >>>> nvidia,memory-controller: >>>> $ref: /schemas/types.yaml#/definitions/phandle >>>> description: >>>> @@ -327,6 +330,7 @@ required: >>>> - clocks >>>> - clock-names >>>> - nvidia,memory-controller >>>> + - "#interconnect-cells" >>> >>> Another required property, what about all existing users of this binding? >> >> EMC/devfreq drivers check presence of the new properties and ask users >> to upgrade the DT. The kernel will continue to work fine using older >> DTBs, but devfreq driver won't load. > > If the devfreq was working fine before (with these older DTBs and older > kernel) then you break the feature. > > If devfreq was not working or was not stable enough, then nothing is > broken so such change is accepted. > > Which one is then? Definitely the latter. The current devfreq works okay'ish, but we rely on hardware to recover from temporal FIFO underflows and it's a user-visible problem which this series addresses. 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[109.252.193.186]) by smtp.googlemail.com with ESMTPSA id t66sm241138lff.85.2020.10.27.13.16.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Oct 2020 13:16:30 -0700 (PDT) Subject: Re: [PATCH v6 13/52] dt-bindings: memory: tegra124: emc: Document new interconnect property To: Krzysztof Kozlowski References: <20201025221735.3062-1-digetx@gmail.com> <20201025221735.3062-14-digetx@gmail.com> <20201027102506.GB17089@kozik-lap> <20201027194833.GE140636@kozik-lap> From: Dmitry Osipenko Message-ID: <0a7aeebf-c5ab-13ea-3927-fa39512afd87@gmail.com> Date: Tue, 27 Oct 2020 23:16:29 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201027194833.GE140636@kozik-lap> Content-Language: en-US X-Mailman-Approved-At: Wed, 28 Oct 2020 08:06:31 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter De Schrijver , Mikko Perttunen , dri-devel@lists.freedesktop.org, Nicolas Chauvet , Stephen Boyd , Viresh Kumar , Michael Turquette , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring , Jonathan Hunter , Chanwoo Choi , Kyungmin Park , Thierry Reding , MyungJoo Ham , Peter Geis , linux-tegra@vger.kernel.org, Georgi Djakov , devicetree@vger.kernel.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" MjcuMTAuMjAyMCAyMjo0OCwgS3J6eXN6dG9mIEtvemxvd3NraSDQv9C40YjQtdGCOgo+IE9uIFR1 ZSwgT2N0IDI3LCAyMDIwIGF0IDEwOjE5OjI4UE0gKzAzMDAsIERtaXRyeSBPc2lwZW5rbyB3cm90 ZToKPj4gMjcuMTAuMjAyMCAxMzoyNSwgS3J6eXN6dG9mIEtvemxvd3NraSDQv9C40YjQtdGCOgo+ Pj4gT24gTW9uLCBPY3QgMjYsIDIwMjAgYXQgMDE6MTY6NTZBTSArMDMwMCwgRG1pdHJ5IE9zaXBl bmtvIHdyb3RlOgo+Pj4+IEV4dGVybmFsIG1lbW9yeSBjb250cm9sbGVyIGlzIGludGVyY29ubmVj dGVkIHdpdGggbWVtb3J5IGNvbnRyb2xsZXIgYW5kCj4+Pj4gd2l0aCBleHRlcm5hbCBtZW1vcnku IERvY3VtZW50IG5ldyBpbnRlcmNvbm5lY3QgcHJvcGVydHkgd2hpY2ggdHVybnMKPj4+PiBFeHRl cm5hbCBNZW1vcnkgQ29udHJvbGxlciBpbnRvIGludGVyY29ubmVjdCBwcm92aWRlci4KPj4+Pgo+ Pj4+IFNpZ25lZC1vZmYtYnk6IERtaXRyeSBPc2lwZW5rbyA8ZGlnZXR4QGdtYWlsLmNvbT4KPj4+ PiAtLS0KPj4+PiAgLi4uL2JpbmRpbmdzL21lbW9yeS1jb250cm9sbGVycy9udmlkaWEsdGVncmEx MjQtZW1jLnlhbWwgICB8IDcgKysrKysrKwo+Pj4+ICAxIGZpbGUgY2hhbmdlZCwgNyBpbnNlcnRp b25zKCspCj4+Pj4KPj4+PiBkaWZmIC0tZ2l0IGEvRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVlL2Jp bmRpbmdzL21lbW9yeS1jb250cm9sbGVycy9udmlkaWEsdGVncmExMjQtZW1jLnlhbWwgYi9Eb2N1 bWVudGF0aW9uL2RldmljZXRyZWUvYmluZGluZ3MvbWVtb3J5LWNvbnRyb2xsZXJzL252aWRpYSx0 ZWdyYTEyNC1lbWMueWFtbAo+Pj4+IGluZGV4IDI3ODU0OWY5ZTA1MS4uYWMwMDgzMmNlYWMxIDEw MDY0NAo+Pj4+IC0tLSBhL0RvY3VtZW50YXRpb24vZGV2aWNldHJlZS9iaW5kaW5ncy9tZW1vcnkt Y29udHJvbGxlcnMvbnZpZGlhLHRlZ3JhMTI0LWVtYy55YW1sCj4+Pj4gKysrIGIvRG9jdW1lbnRh dGlvbi9kZXZpY2V0cmVlL2JpbmRpbmdzL21lbW9yeS1jb250cm9sbGVycy9udmlkaWEsdGVncmEx MjQtZW1jLnlhbWwKPj4+PiBAQCAtMjksNiArMjksOSBAQCBwcm9wZXJ0aWVzOgo+Pj4+ICAgICAg aXRlbXM6Cj4+Pj4gICAgICAgIC0gY29uc3Q6IGVtYwo+Pj4+ICAKPj4+PiArICAiI2ludGVyY29u bmVjdC1jZWxscyI6Cj4+Pj4gKyAgICBjb25zdDogMAo+Pj4+ICsKPj4+PiAgICBudmlkaWEsbWVt b3J5LWNvbnRyb2xsZXI6Cj4+Pj4gICAgICAkcmVmOiAvc2NoZW1hcy90eXBlcy55YW1sIy9kZWZp bml0aW9ucy9waGFuZGxlCj4+Pj4gICAgICBkZXNjcmlwdGlvbjoKPj4+PiBAQCAtMzI3LDYgKzMz MCw3IEBAIHJlcXVpcmVkOgo+Pj4+ICAgIC0gY2xvY2tzCj4+Pj4gICAgLSBjbG9jay1uYW1lcwo+ Pj4+ICAgIC0gbnZpZGlhLG1lbW9yeS1jb250cm9sbGVyCj4+Pj4gKyAgLSAiI2ludGVyY29ubmVj dC1jZWxscyIKPj4+Cj4+PiBBbm90aGVyIHJlcXVpcmVkIHByb3BlcnR5LCB3aGF0IGFib3V0IGFs bCBleGlzdGluZyB1c2VycyBvZiB0aGlzIGJpbmRpbmc/Cj4+Cj4+IEVNQy9kZXZmcmVxIGRyaXZl cnMgY2hlY2sgcHJlc2VuY2Ugb2YgdGhlIG5ldyBwcm9wZXJ0aWVzIGFuZCBhc2sgdXNlcnMKPj4g dG8gdXBncmFkZSB0aGUgRFQuIFRoZSBrZXJuZWwgd2lsbCBjb250aW51ZSB0byB3b3JrIGZpbmUg dXNpbmcgb2xkZXIKPj4gRFRCcywgYnV0IGRldmZyZXEgZHJpdmVyIHdvbid0IGxvYWQuCj4gCj4g SWYgdGhlIGRldmZyZXEgd2FzIHdvcmtpbmcgZmluZSBiZWZvcmUgKHdpdGggdGhlc2Ugb2xkZXIg RFRCcyBhbmQgb2xkZXIKPiBrZXJuZWwpIHRoZW4geW91IGJyZWFrIHRoZSBmZWF0dXJlLgo+IAo+ IElmIGRldmZyZXEgd2FzIG5vdCB3b3JraW5nIG9yIHdhcyBub3Qgc3RhYmxlIGVub3VnaCwgdGhl biBub3RoaW5nIGlzCj4gYnJva2VuIHNvIHN1Y2ggY2hhbmdlIGlzIGFjY2VwdGVkLgo+IAo+IFdo aWNoIG9uZSBpcyB0aGVuPwoKRGVmaW5pdGVseSB0aGUgbGF0dGVyLiBUaGUgY3VycmVudCBkZXZm cmVxIHdvcmtzIG9rYXknaXNoLCBidXQgd2UgcmVseQpvbiBoYXJkd2FyZSB0byByZWNvdmVyIGZy b20gdGVtcG9yYWwgRklGTyB1bmRlcmZsb3dzIGFuZCBpdCdzIGEKdXNlci12aXNpYmxlIHByb2Js ZW0gd2hpY2ggdGhpcyBzZXJpZXMgYWRkcmVzc2VzLgpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBs aXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1h bi9saXN0aW5mby9kcmktZGV2ZWwK