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[212.114.21.58]) by smtp.gmail.com with ESMTPSA id p9-20020a5d48c9000000b002c567881dbcsm7529470wrs.48.2023.03.13.04.23.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Mar 2023 04:23:13 -0700 (PDT) Message-ID: Date: Mon, 13 Mar 2023 12:23:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.2 From: Neil Armstrong Subject: Re: [RFC PATCH v1] mtd: rawnand: meson: invalidate cache on polling ECC bit Content-Language: en-US To: Miquel Raynal , Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@sberdevices.ru, oxffffaa@gmail.com References: <20f7f1f8-e8f8-b3e1-251e-27db71ab6840@sberdevices.ru> <20230313121808.27170d1b@xps-13> Organization: Linaro Developer Services In-Reply-To: <20230313121808.27170d1b@xps-13> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230313_042317_922261_52FA3833 X-CRM114-Status: GOOD ( 19.75 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: neil.armstrong@linaro.org Content-Transfer-Encoding: base64 Content-Type: text/plain; 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[212.114.21.58]) by smtp.gmail.com with ESMTPSA id p9-20020a5d48c9000000b002c567881dbcsm7529470wrs.48.2023.03.13.04.23.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Mar 2023 04:23:13 -0700 (PDT) Message-ID: Date: Mon, 13 Mar 2023 12:23:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.2 From: Neil Armstrong Subject: Re: [RFC PATCH v1] mtd: rawnand: meson: invalidate cache on polling ECC bit Content-Language: en-US To: Miquel Raynal , Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@sberdevices.ru, oxffffaa@gmail.com References: <20f7f1f8-e8f8-b3e1-251e-27db71ab6840@sberdevices.ru> <20230313121808.27170d1b@xps-13> Organization: Linaro Developer Services In-Reply-To: <20230313121808.27170d1b@xps-13> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230313_042317_890755_66A3E94B X-CRM114-Status: GOOD ( 20.37 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: neil.armstrong@linaro.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org T24gMTMvMDMvMjAyMyAxMjoxOCwgTWlxdWVsIFJheW5hbCB3cm90ZToKPiBIaSBBcnNlbml5LAo+ IAo+IGF2a3Jhc25vdkBzYmVyZGV2aWNlcy5ydSB3cm90ZSBvbiBNb24sIDEzIE1hciAyMDIzIDEw OjM2OjExICswMzAwOgo+IAo+PiBIZWxsbywKPj4KPj4gd2UgcmVwcm9kdWNlZCB0aGlzIHByb2Js ZW0gb24gb25lIG9mIG91ciBib2FyZHMuIEl0IHRyaWdnZXJzIHZlcnkgcmFyZQo+PiB3aGVuICd1 c2xlZXBfcmFuZ2UoKScgaXMgcHJlc2VudCwgYnV0IHdoZW4gc2xlZXBpbmcgaXMgcmVtb3ZlZCAt IGl0IGZpcmVzCj4+IGFsd2F5cy4gSSBzdXBwb3NlIHByb2JsZW0gaXMgd2l0aCBjYWNoaW5nLCBh cyAnaW5mb19idWYnIG1lbW9yeSBpcyBtYXBwZWQgYnkKPj4gJ2RtYV9tYXBfc2luZ2xlKCknLgo+ IAo+IFRoZSBmaXggbG9va3MgcmVhbGx5IGxlZ2l0aW1hdGUsIGluZGVlZCBJIGdldCB0aGF0IHRo ZSB1c2xlZXBfcmFuZ2UoKQo+IG1pZ2h0IG1ha2UgaXQgd29yayBtb3N0IG9mIHRoZSB0aW1lIGJ1 dCBub3QgYWx3YXlzLiBIYXZpbmcgdGhpcyBiaXQgaW4KPiBhIERNQSBidWYgYXJlYSBpcyBhIGJp dCBzdHJhbmdlLiBXZWxsLCB0aGUgZml4IExHVE0gYW55d2F5LgoKWWVwIGl0IGxvb2tzIGxlZ2l0 aW1hdGUhCgpMR1RNCgoKUmV2aWV3ZWQtYnk6IE5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9u Z0BsaW5hcm8ub3JnPgoKPiAKPj4KPj4gVGhhbmtzLCBBcnNlbml5Cj4+Cj4+IE9uIDEzLjAzLjIw MjMgMTA6MzIsIEFyc2VuaXkgS3Jhc25vdiB3cm90ZToKPj4+ICdpbmZvX2J1ZicgbWVtb3J5IGlz IGNhY2hlZCBhbmQgZHJpdmVyIHBvbGxzIEVDQyBiaXQgaW4gaXQuIFRoaXMgYml0Cj4+PiBpcyBz ZXQgYnkgdGhlIE5BTkQgY29udHJvbGxlci4gSWYgJ3VzbGVlcF9yYW5nZSgpJyByZXR1cm5zIGJl Zm9yZSBkZXZpY2UKPj4+IHNldHMgdGhpcyBiaXQsICdpbmZvX2J1Zicgd2lsbCBiZSBjYWNoZWQg YW5kIGRyaXZlciB3b24ndCBzZWUgdXBkYXRlIG9mCj4+PiB0aGlzIGJpdCBhbmQgd2lsbCBsb29w IGZvcmV2ZXIuCj4+Pgo+Pj4gRml4ZXM6IDhmYWU4NTZjNTM1MCAoIm10ZDogcmF3bmFuZDogbWVz b246IGFkZCBzdXBwb3J0IGZvciBBbWxvZ2ljIE5BTkQgZmxhc2ggY29udHJvbGxlciIpCj4+PiBT aWduZWQtb2ZmLWJ5OiBBcnNlbml5IEtyYXNub3YgPEFWS3Jhc25vdkBzYmVyZGV2aWNlcy5ydT4K Pj4+IC0tLQo+Pj4gICBkcml2ZXJzL210ZC9uYW5kL3Jhdy9tZXNvbl9uYW5kLmMgfCA4ICsrKysr KystCj4+PiAgIDEgZmlsZSBjaGFuZ2VkLCA3IGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkK Pj4+Cj4+PiBkaWZmIC0tZ2l0IGEvZHJpdmVycy9tdGQvbmFuZC9yYXcvbWVzb25fbmFuZC5jIGIv ZHJpdmVycy9tdGQvbmFuZC9yYXcvbWVzb25fbmFuZC5jCj4+PiBpbmRleCA1ZWUwMTIzMWFjNGMu LjJjMDVjMDhhMGVhZiAxMDA2NDQKPj4+IC0tLSBhL2RyaXZlcnMvbXRkL25hbmQvcmF3L21lc29u X25hbmQuYwo+Pj4gKysrIGIvZHJpdmVycy9tdGQvbmFuZC9yYXcvbWVzb25fbmFuZC5jCj4+PiBA QCAtMTc2LDYgKzE3Niw3IEBAIHN0cnVjdCBtZXNvbl9uZmMgewo+Pj4gICAKPj4+ICAgCWRtYV9h ZGRyX3QgZGFkZHI7Cj4+PiAgIAlkbWFfYWRkcl90IGlhZGRyOwo+Pj4gKwl1MzIgaW5mb19ieXRl czsKPj4+ICAgCj4+PiAgIAl1bnNpZ25lZCBsb25nIGFzc2lnbmVkX2NzOwo+Pj4gICB9Owo+Pj4g QEAgLTUwMyw2ICs1MDQsNyBAQCBzdGF0aWMgaW50IG1lc29uX25mY19kbWFfYnVmZmVyX3NldHVw KHN0cnVjdCBuYW5kX2NoaXAgKm5hbmQsIHZvaWQgKmRhdGFidWYsCj4+PiAgIAkJCQkJIG5mYy0+ ZGFkZHIsIGRhdGFsZW4sIGRpcik7Cj4+PiAgIAkJCXJldHVybiByZXQ7Cj4+PiAgIAkJfQo+Pj4g KwkJbmZjLT5pbmZvX2J5dGVzID0gaW5mb2xlbjsKPj4+ICAgCQljbWQgPSBHRU5DTURJQUREUkwo TkZDX0NNRF9BSUwsIG5mYy0+aWFkZHIpOwo+Pj4gICAJCXdyaXRlbChjbWQsIG5mYy0+cmVnX2Jh c2UgKyBORkNfUkVHX0NNRCk7Cj4+PiAgIAo+Pj4gQEAgLTUyMCw4ICs1MjIsMTAgQEAgc3RhdGlj IHZvaWQgbWVzb25fbmZjX2RtYV9idWZmZXJfcmVsZWFzZShzdHJ1Y3QgbmFuZF9jaGlwICpuYW5k LAo+Pj4gICAJc3RydWN0IG1lc29uX25mYyAqbmZjID0gbmFuZF9nZXRfY29udHJvbGxlcl9kYXRh KG5hbmQpOwo+Pj4gICAKPj4+ICAgCWRtYV91bm1hcF9zaW5nbGUobmZjLT5kZXYsIG5mYy0+ZGFk ZHIsIGRhdGFsZW4sIGRpcik7Cj4+PiAtCWlmIChpbmZvbGVuKQo+Pj4gKwlpZiAoaW5mb2xlbikg ewo+Pj4gICAJCWRtYV91bm1hcF9zaW5nbGUobmZjLT5kZXYsIG5mYy0+aWFkZHIsIGluZm9sZW4s IGRpcik7Cj4+PiArCQluZmMtPmluZm9fYnl0ZXMgPSAwOwo+Pj4gKwl9Cj4+PiAgIH0KPj4+ICAg Cj4+PiAgIHN0YXRpYyBpbnQgbWVzb25fbmZjX3JlYWRfYnVmKHN0cnVjdCBuYW5kX2NoaXAgKm5h bmQsIHU4ICpidWYsIGludCBsZW4pCj4+PiBAQCAtNzEwLDYgKzcxNCw4IEBAIHN0YXRpYyB2b2lk IG1lc29uX25mY19jaGVja19lY2NfcGFnZXNfdmFsaWQoc3RydWN0IG1lc29uX25mYyAqbmZjLAo+ Pj4gICAJCXVzbGVlcF9yYW5nZSgxMCwgMTUpOwo+Pj4gICAJCS8qIGluZm8gaXMgdXBkYXRlZCBi eSBuZmMgZG1hIGVuZ2luZSovCj4+PiAgIAkJc21wX3JtYigpOwo+Pj4gKwkJZG1hX3N5bmNfc2lu Z2xlX2Zvcl9jcHUobmZjLT5kZXYsIG5mYy0+aWFkZHIsIG5mYy0+aW5mb19ieXRlcywKPj4+ICsJ CQkJCURNQV9GUk9NX0RFVklDRSk7Cj4+PiAgIAkJcmV0ID0gKmluZm8gJiBFQ0NfQ09NUExFVEU7 Cj4+PiAgIAl9IHdoaWxlICghcmV0KTsKPj4+ICAgfQo+IAo+IAo+IFRoYW5rcywKPiBNaXF1w6hs CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f CkxpbnV4IE1URCBkaXNjdXNzaW9uIG1haWxpbmcgbGlzdApodHRwOi8vbGlzdHMuaW5mcmFkZWFk Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LW10ZC8K From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 702E8C6FD19 for ; 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[212.114.21.58]) by smtp.gmail.com with ESMTPSA id p9-20020a5d48c9000000b002c567881dbcsm7529470wrs.48.2023.03.13.04.23.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Mar 2023 04:23:13 -0700 (PDT) Message-ID: Date: Mon, 13 Mar 2023 12:23:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.2 From: Neil Armstrong Subject: Re: [RFC PATCH v1] mtd: rawnand: meson: invalidate cache on polling ECC bit Content-Language: en-US To: Miquel Raynal , Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@sberdevices.ru, oxffffaa@gmail.com References: <20f7f1f8-e8f8-b3e1-251e-27db71ab6840@sberdevices.ru> <20230313121808.27170d1b@xps-13> Organization: Linaro Developer Services In-Reply-To: <20230313121808.27170d1b@xps-13> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230313_042317_882850_6097F0B4 X-CRM114-Status: GOOD ( 21.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: neil.armstrong@linaro.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMTMvMDMvMjAyMyAxMjoxOCwgTWlxdWVsIFJheW5hbCB3cm90ZToKPiBIaSBBcnNlbml5LAo+ IAo+IGF2a3Jhc25vdkBzYmVyZGV2aWNlcy5ydSB3cm90ZSBvbiBNb24sIDEzIE1hciAyMDIzIDEw OjM2OjExICswMzAwOgo+IAo+PiBIZWxsbywKPj4KPj4gd2UgcmVwcm9kdWNlZCB0aGlzIHByb2Js ZW0gb24gb25lIG9mIG91ciBib2FyZHMuIEl0IHRyaWdnZXJzIHZlcnkgcmFyZQo+PiB3aGVuICd1 c2xlZXBfcmFuZ2UoKScgaXMgcHJlc2VudCwgYnV0IHdoZW4gc2xlZXBpbmcgaXMgcmVtb3ZlZCAt IGl0IGZpcmVzCj4+IGFsd2F5cy4gSSBzdXBwb3NlIHByb2JsZW0gaXMgd2l0aCBjYWNoaW5nLCBh cyAnaW5mb19idWYnIG1lbW9yeSBpcyBtYXBwZWQgYnkKPj4gJ2RtYV9tYXBfc2luZ2xlKCknLgo+ IAo+IFRoZSBmaXggbG9va3MgcmVhbGx5IGxlZ2l0aW1hdGUsIGluZGVlZCBJIGdldCB0aGF0IHRo ZSB1c2xlZXBfcmFuZ2UoKQo+IG1pZ2h0IG1ha2UgaXQgd29yayBtb3N0IG9mIHRoZSB0aW1lIGJ1 dCBub3QgYWx3YXlzLiBIYXZpbmcgdGhpcyBiaXQgaW4KPiBhIERNQSBidWYgYXJlYSBpcyBhIGJp dCBzdHJhbmdlLiBXZWxsLCB0aGUgZml4IExHVE0gYW55d2F5LgoKWWVwIGl0IGxvb2tzIGxlZ2l0 aW1hdGUhCgpMR1RNCgoKUmV2aWV3ZWQtYnk6IE5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9u Z0BsaW5hcm8ub3JnPgoKPiAKPj4KPj4gVGhhbmtzLCBBcnNlbml5Cj4+Cj4+IE9uIDEzLjAzLjIw MjMgMTA6MzIsIEFyc2VuaXkgS3Jhc25vdiB3cm90ZToKPj4+ICdpbmZvX2J1ZicgbWVtb3J5IGlz IGNhY2hlZCBhbmQgZHJpdmVyIHBvbGxzIEVDQyBiaXQgaW4gaXQuIFRoaXMgYml0Cj4+PiBpcyBz ZXQgYnkgdGhlIE5BTkQgY29udHJvbGxlci4gSWYgJ3VzbGVlcF9yYW5nZSgpJyByZXR1cm5zIGJl Zm9yZSBkZXZpY2UKPj4+IHNldHMgdGhpcyBiaXQsICdpbmZvX2J1Zicgd2lsbCBiZSBjYWNoZWQg YW5kIGRyaXZlciB3b24ndCBzZWUgdXBkYXRlIG9mCj4+PiB0aGlzIGJpdCBhbmQgd2lsbCBsb29w IGZvcmV2ZXIuCj4+Pgo+Pj4gRml4ZXM6IDhmYWU4NTZjNTM1MCAoIm10ZDogcmF3bmFuZDogbWVz b246IGFkZCBzdXBwb3J0IGZvciBBbWxvZ2ljIE5BTkQgZmxhc2ggY29udHJvbGxlciIpCj4+PiBT aWduZWQtb2ZmLWJ5OiBBcnNlbml5IEtyYXNub3YgPEFWS3Jhc25vdkBzYmVyZGV2aWNlcy5ydT4K Pj4+IC0tLQo+Pj4gICBkcml2ZXJzL210ZC9uYW5kL3Jhdy9tZXNvbl9uYW5kLmMgfCA4ICsrKysr KystCj4+PiAgIDEgZmlsZSBjaGFuZ2VkLCA3IGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkK Pj4+Cj4+PiBkaWZmIC0tZ2l0IGEvZHJpdmVycy9tdGQvbmFuZC9yYXcvbWVzb25fbmFuZC5jIGIv ZHJpdmVycy9tdGQvbmFuZC9yYXcvbWVzb25fbmFuZC5jCj4+PiBpbmRleCA1ZWUwMTIzMWFjNGMu LjJjMDVjMDhhMGVhZiAxMDA2NDQKPj4+IC0tLSBhL2RyaXZlcnMvbXRkL25hbmQvcmF3L21lc29u X25hbmQuYwo+Pj4gKysrIGIvZHJpdmVycy9tdGQvbmFuZC9yYXcvbWVzb25fbmFuZC5jCj4+PiBA QCAtMTc2LDYgKzE3Niw3IEBAIHN0cnVjdCBtZXNvbl9uZmMgewo+Pj4gICAKPj4+ICAgCWRtYV9h ZGRyX3QgZGFkZHI7Cj4+PiAgIAlkbWFfYWRkcl90IGlhZGRyOwo+Pj4gKwl1MzIgaW5mb19ieXRl czsKPj4+ICAgCj4+PiAgIAl1bnNpZ25lZCBsb25nIGFzc2lnbmVkX2NzOwo+Pj4gICB9Owo+Pj4g QEAgLTUwMyw2ICs1MDQsNyBAQCBzdGF0aWMgaW50IG1lc29uX25mY19kbWFfYnVmZmVyX3NldHVw KHN0cnVjdCBuYW5kX2NoaXAgKm5hbmQsIHZvaWQgKmRhdGFidWYsCj4+PiAgIAkJCQkJIG5mYy0+ ZGFkZHIsIGRhdGFsZW4sIGRpcik7Cj4+PiAgIAkJCXJldHVybiByZXQ7Cj4+PiAgIAkJfQo+Pj4g KwkJbmZjLT5pbmZvX2J5dGVzID0gaW5mb2xlbjsKPj4+ICAgCQljbWQgPSBHRU5DTURJQUREUkwo TkZDX0NNRF9BSUwsIG5mYy0+aWFkZHIpOwo+Pj4gICAJCXdyaXRlbChjbWQsIG5mYy0+cmVnX2Jh c2UgKyBORkNfUkVHX0NNRCk7Cj4+PiAgIAo+Pj4gQEAgLTUyMCw4ICs1MjIsMTAgQEAgc3RhdGlj IHZvaWQgbWVzb25fbmZjX2RtYV9idWZmZXJfcmVsZWFzZShzdHJ1Y3QgbmFuZF9jaGlwICpuYW5k LAo+Pj4gICAJc3RydWN0IG1lc29uX25mYyAqbmZjID0gbmFuZF9nZXRfY29udHJvbGxlcl9kYXRh KG5hbmQpOwo+Pj4gICAKPj4+ICAgCWRtYV91bm1hcF9zaW5nbGUobmZjLT5kZXYsIG5mYy0+ZGFk ZHIsIGRhdGFsZW4sIGRpcik7Cj4+PiAtCWlmIChpbmZvbGVuKQo+Pj4gKwlpZiAoaW5mb2xlbikg ewo+Pj4gICAJCWRtYV91bm1hcF9zaW5nbGUobmZjLT5kZXYsIG5mYy0+aWFkZHIsIGluZm9sZW4s IGRpcik7Cj4+PiArCQluZmMtPmluZm9fYnl0ZXMgPSAwOwo+Pj4gKwl9Cj4+PiAgIH0KPj4+ICAg Cj4+PiAgIHN0YXRpYyBpbnQgbWVzb25fbmZjX3JlYWRfYnVmKHN0cnVjdCBuYW5kX2NoaXAgKm5h bmQsIHU4ICpidWYsIGludCBsZW4pCj4+PiBAQCAtNzEwLDYgKzcxNCw4IEBAIHN0YXRpYyB2b2lk IG1lc29uX25mY19jaGVja19lY2NfcGFnZXNfdmFsaWQoc3RydWN0IG1lc29uX25mYyAqbmZjLAo+ Pj4gICAJCXVzbGVlcF9yYW5nZSgxMCwgMTUpOwo+Pj4gICAJCS8qIGluZm8gaXMgdXBkYXRlZCBi eSBuZmMgZG1hIGVuZ2luZSovCj4+PiAgIAkJc21wX3JtYigpOwo+Pj4gKwkJZG1hX3N5bmNfc2lu Z2xlX2Zvcl9jcHUobmZjLT5kZXYsIG5mYy0+aWFkZHIsIG5mYy0+aW5mb19ieXRlcywKPj4+ICsJ CQkJCURNQV9GUk9NX0RFVklDRSk7Cj4+PiAgIAkJcmV0ID0gKmluZm8gJiBFQ0NfQ09NUExFVEU7 Cj4+PiAgIAl9IHdoaWxlICghcmV0KTsKPj4+ICAgfQo+IAo+IAo+IFRoYW5rcywKPiBNaXF1w6hs CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgt YXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQu b3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJt LWtlcm5lbAo= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7553EC61DA4 for ; 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[212.114.21.58]) by smtp.gmail.com with ESMTPSA id p9-20020a5d48c9000000b002c567881dbcsm7529470wrs.48.2023.03.13.04.23.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Mar 2023 04:23:13 -0700 (PDT) Message-ID: Date: Mon, 13 Mar 2023 12:23:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.2 From: Neil Armstrong Reply-To: neil.armstrong@linaro.org Subject: Re: [RFC PATCH v1] mtd: rawnand: meson: invalidate cache on polling ECC bit Content-Language: en-US To: Miquel Raynal , Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jianxin Pan , linux-mtd@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@sberdevices.ru, oxffffaa@gmail.com References: <20f7f1f8-e8f8-b3e1-251e-27db71ab6840@sberdevices.ru> <20230313121808.27170d1b@xps-13> Organization: Linaro Developer Services In-Reply-To: <20230313121808.27170d1b@xps-13> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13/03/2023 12:18, Miquel Raynal wrote: > Hi Arseniy, > > avkrasnov@sberdevices.ru wrote on Mon, 13 Mar 2023 10:36:11 +0300: > >> Hello, >> >> we reproduced this problem on one of our boards. It triggers very rare >> when 'usleep_range()' is present, but when sleeping is removed - it fires >> always. I suppose problem is with caching, as 'info_buf' memory is mapped by >> 'dma_map_single()'. > > The fix looks really legitimate, indeed I get that the usleep_range() > might make it work most of the time but not always. Having this bit in > a DMA buf area is a bit strange. Well, the fix LGTM anyway. Yep it looks legitimate! LGTM Reviewed-by: Neil Armstrong > >> >> Thanks, Arseniy >> >> On 13.03.2023 10:32, Arseniy Krasnov wrote: >>> 'info_buf' memory is cached and driver polls ECC bit in it. This bit >>> is set by the NAND controller. If 'usleep_range()' returns before device >>> sets this bit, 'info_buf' will be cached and driver won't see update of >>> this bit and will loop forever. >>> >>> Fixes: 8fae856c5350 ("mtd: rawnand: meson: add support for Amlogic NAND flash controller") >>> Signed-off-by: Arseniy Krasnov >>> --- >>> drivers/mtd/nand/raw/meson_nand.c | 8 +++++++- >>> 1 file changed, 7 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c >>> index 5ee01231ac4c..2c05c08a0eaf 100644 >>> --- a/drivers/mtd/nand/raw/meson_nand.c >>> +++ b/drivers/mtd/nand/raw/meson_nand.c >>> @@ -176,6 +176,7 @@ struct meson_nfc { >>> >>> dma_addr_t daddr; >>> dma_addr_t iaddr; >>> + u32 info_bytes; >>> >>> unsigned long assigned_cs; >>> }; >>> @@ -503,6 +504,7 @@ static int meson_nfc_dma_buffer_setup(struct nand_chip *nand, void *databuf, >>> nfc->daddr, datalen, dir); >>> return ret; >>> } >>> + nfc->info_bytes = infolen; >>> cmd = GENCMDIADDRL(NFC_CMD_AIL, nfc->iaddr); >>> writel(cmd, nfc->reg_base + NFC_REG_CMD); >>> >>> @@ -520,8 +522,10 @@ static void meson_nfc_dma_buffer_release(struct nand_chip *nand, >>> struct meson_nfc *nfc = nand_get_controller_data(nand); >>> >>> dma_unmap_single(nfc->dev, nfc->daddr, datalen, dir); >>> - if (infolen) >>> + if (infolen) { >>> dma_unmap_single(nfc->dev, nfc->iaddr, infolen, dir); >>> + nfc->info_bytes = 0; >>> + } >>> } >>> >>> static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len) >>> @@ -710,6 +714,8 @@ static void meson_nfc_check_ecc_pages_valid(struct meson_nfc *nfc, >>> usleep_range(10, 15); >>> /* info is updated by nfc dma engine*/ >>> smp_rmb(); >>> + dma_sync_single_for_cpu(nfc->dev, nfc->iaddr, nfc->info_bytes, >>> + DMA_FROM_DEVICE); >>> ret = *info & ECC_COMPLETE; >>> } while (!ret); >>> } > > > Thanks, > Miquèl