[{"id":1776416,"web_url":"http://patchwork.ozlabs.org/comment/1776416/","msgid":"<20170927170811.57830c1f@bbrezillon>","list_archive_url":null,"date":"2017-09-27T15:08:11","subject":"Re: [PATCH v3 4/8] mtd: nand: atmel: Avoid ECC errors when leaving\n\tbackup mode","submitter":{"id":63120,"url":"http://patchwork.ozlabs.org/api/people/63120/","name":"Boris Brezillon","email":"boris.brezillon@free-electrons.com"},"content":"On Wed, 27 Sep 2017 10:35:51 +0200\nRomain Izard wrote:\n\n> During backup mode, the contents of all registers will be cleared as the\n> SoC will be completely powered down. For a product that boots on NAND\n> Flash memory, the bootloader will obviously use the related controller\n> to read the Flash and correct any detected error in the memory, before\n> handling back control to the kernel's resuming entry point.\n> \n> But it does not clean the NAND controller registers after use and on its\n> side the kernel driver expects the error locator to be powered down and\n> in a clean state. Add a resume hook for the PMECC error locator, and\n> reset its registers.\n> \n> Signed-off-by: Romain Izard \n> ---\n> Change in v3:\n> * keep the PMECC disabled when not in use, and use atmel_pmecc_resume to\n> reset the controller after the bootloader has left it enabled.\n> \n> drivers/mtd/nand/atmel/nand-controller.c | 3 +++\n> drivers/mtd/nand/atmel/pmecc.c | 22 ++++++++++++++--------\n> drivers/mtd/nand/atmel/pmecc.h | 1 +\n> 3 files changed, 18 insertions(+), 8 deletions(-)\n> \n> diff --git a/drivers/mtd/nand/atmel/nand-controller.c b/drivers/mtd/nand/atmel/nand-controller.c\n> index f25eca79f4e5..86c2199380c2 100644\n> --- a/drivers/mtd/nand/atmel/nand-controller.c\n> +++ b/drivers/mtd/nand/atmel/nand-controller.c\n> @@ -2530,6 +2530,9 @@ static __maybe_unused int atmel_nand_controller_resume(struct device *dev)\n> \tstruct atmel_nand_controller *nc = dev_get_drvdata(dev);\n> \tstruct atmel_nand *nand;\n> \n> +\tif (nand->pmecc)\n> +\t\tatmel_pmecc_resume(nand->pmecc);\n> +\n\nnand is used uninitialized here, and atmel_pmecc_resume() should be\npassed a atmel_pmecc object not a atmel_pmecc_user.\n\n\tif (nc->pmecc)\n\t\tatmel_pmecc_resume(nc->pmecc);\n\n> \tlist_for_each_entry(nand, &nc->chips, node) {\n> \t\tint i;\n> \n> diff --git a/drivers/mtd/nand/atmel/pmecc.c b/drivers/mtd/nand/atmel/pmecc.c\n> index 146af8218314..ff09c0f25dd4 100644\n> --- a/drivers/mtd/nand/atmel/pmecc.c\n> +++ b/drivers/mtd/nand/atmel/pmecc.c\n> @@ -765,6 +765,12 @@ void atmel_pmecc_get_generated_eccbytes(struct atmel_pmecc_user *user,\n> }\n> EXPORT_SYMBOL_GPL(atmel_pmecc_get_generated_eccbytes);\n> \n> +void atmel_pmecc_reset(struct atmel_pmecc *pmecc)\n> +{\n> +\twritel(PMECC_CTRL_RST, pmecc->regs.base + ATMEL_PMECC_CTRL);\n> +\twritel(PMECC_CTRL_DISABLE, pmecc->regs.base + ATMEL_PMECC_CTRL);\n> +}\n\nIt's not used outside of this file, so it should have a static\nspecifier. Anyway, I wonder why you don't expose atmel_pmecc_reset()\ndirectly instead of creating this atmel_pmecc_resume() wrapper.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org; spf=none (mailfrom)\n\tsmtp.mailfrom=lists.infradead.org (client-ip=65.50.211.133;\n\thelo=bombadil.infradead.org;\n\tenvelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"GPBnSPUA\"; \n\tdkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y2Lnb4TzSz9tXs\n\tfor ;\n\tThu, 28 Sep 2017 01:09:07 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dxDx3-0005cn-5u; 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bh=8rM7DCEHCDvyZt7C+RXGM7+IvwaCtbeIazk/vUtKqoc=;\n\tb=GPBnSPUARJYpTc\n\tByumm4KGArTinQopfjnzhSL7G3Ow0e19QJJz15Xf64R0p6x9Y3wMIbiIKrpe4Xsg+mvrIpKJ9jBbB\n\tDK4HaK3aFy90viixHauNaVvhorYre/EGkLYXA5mXzmMboYYDvVzkt1rhb/NFY2yXL6XbjB5LHdIMd\n\t2XkxX0Wc7NioETPvELDCg1ECXBcrhPLBpDoiYMMvlaC98q83PZ1sfQTg3aW5AbeOaSEfPznjYLBwx\n\t9u7bHJ4leGoEzd0nW4YgQUOmjrf980RxqlB9nmGVbr8/RuUIpL6qTTWl15RQkB7DRIVGYeKDa0Zww\n\tIlTSr/4Hwxpe8fM+XDtg==;","X-Spam-Checker-Version":"SpamAssassin 3.4.0 (2014-02-07) on\n\tmail.free-electrons.com","X-Spam-Level":"","X-Spam-Status":"No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT\n\tshortcircuit=ham autolearn=disabled version=3.4.0","Date":"Wed, 27 Sep 2017 17:08:11 +0200","From":"Boris Brezillon ","To":"Romain Izard ","Subject":"Re: [PATCH v3 4/8] mtd: nand: atmel: Avoid ECC errors when leaving\n\tbackup mode","Message-ID":"<20170927170811.57830c1f@bbrezillon>","In-Reply-To":"<20170927083555.16580-5-romain.izard.pro@gmail.com>","References":"<20170927083555.16580-1-romain.izard.pro@gmail.com>\n\t<20170927083555.16580-5-romain.izard.pro@gmail.com>","X-Mailer":"Claws Mail 3.14.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu)","MIME-Version":"1.0","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20170927_080834_118228_EFBAB539 ","X-CRM114-Status":"GOOD ( 19.51 )","X-Spam-Score":"-1.9 (-)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-1.9 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay\n\tdomain\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]","X-BeenThere":"linux-mtd@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Id":"Linux MTD discussion mailing list ","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"Michael Turquette , linux-kernel@vger.kernel.org,\n\tThierry Reding ,\n\tAlexandre Belloni ,\n\tLee Jones , linux-clk@vger.kernel.org,\n\tRichard Weinberger ,\n\tMarek Vasut , \n\tLudovic Desroches ,\n\tAlan Stern , linux-serial@vger.kernel.org, \n\tJiri Slaby , Josh Wu ,\n\tlinux-pwm@vger.kernel.org, Richard Genoud , \n\tGreg Kroah-Hartman ,\n\tlinux-usb@vger.kernel.org, Stephen Boyd ,\n\tNicolas Ferre ,\n\tWenyou Yang ,\n\tCyrille Pitchen ,\n\tlinux-mtd@lists.infradead.org, \n\tBrian Norris ,\n\tDavid Woodhouse ","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-mtd\" ","Errors-To":"linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}},{"id":1776427,"web_url":"http://patchwork.ozlabs.org/comment/1776427/","msgid":"","list_archive_url":null,"date":"2017-09-27T15:32:10","subject":"Re: [PATCH v3 4/8] mtd: nand: atmel: Avoid ECC errors when leaving\n\tbackup mode","submitter":{"id":8236,"url":"http://patchwork.ozlabs.org/api/people/8236/","name":"Romain Izard","email":"romain.izard.pro@gmail.com"},"content":"2017-09-27 17:08 GMT+02:00 Boris Brezillon :\n> On Wed, 27 Sep 2017 10:35:51 +0200\n> Romain Izard wrote:\n>\n>> During backup mode, the contents of all registers will be cleared as the\n>> SoC will be completely powered down. For a product that boots on NAND\n>> Flash memory, the bootloader will obviously use the related controller\n>> to read the Flash and correct any detected error in the memory, before\n>> handling back control to the kernel's resuming entry point.\n>>\n>> But it does not clean the NAND controller registers after use and on its\n>> side the kernel driver expects the error locator to be powered down and\n>> in a clean state. Add a resume hook for the PMECC error locator, and\n>> reset its registers.\n>>\n>> Signed-off-by: Romain Izard \n>> ---\n>> Change in v3:\n>> * keep the PMECC disabled when not in use, and use atmel_pmecc_resume to\n>> reset the controller after the bootloader has left it enabled.\n>>\n>> drivers/mtd/nand/atmel/nand-controller.c | 3 +++\n>> drivers/mtd/nand/atmel/pmecc.c | 22 ++++++++++++++--------\n>> drivers/mtd/nand/atmel/pmecc.h | 1 +\n>> 3 files changed, 18 insertions(+), 8 deletions(-)\n>>\n>> diff --git a/drivers/mtd/nand/atmel/nand-controller.c b/drivers/mtd/nand/atmel/nand-controller.c\n>> index f25eca79f4e5..86c2199380c2 100644\n>> --- a/drivers/mtd/nand/atmel/nand-controller.c\n>> +++ b/drivers/mtd/nand/atmel/nand-controller.c\n>> @@ -2530,6 +2530,9 @@ static __maybe_unused int atmel_nand_controller_resume(struct device *dev)\n>> struct atmel_nand_controller *nc = dev_get_drvdata(dev);\n>> struct atmel_nand *nand;\n>>\n>> + if (nand->pmecc)\n>> + atmel_pmecc_resume(nand->pmecc);\n>> +\n>\n> nand is used uninitialized here, and atmel_pmecc_resume() should be\n> passed a atmel_pmecc object not a atmel_pmecc_user.\n>\n> if (nc->pmecc)\n> atmel_pmecc_resume(nc->pmecc);\n>\nAnd yet I thought I correctly tested this code...\n\n:(\n\n>> list_for_each_entry(nand, &nc->chips, node) {\n>> int i;\n>>\n>> diff --git a/drivers/mtd/nand/atmel/pmecc.c b/drivers/mtd/nand/atmel/pmecc.c\n>> index 146af8218314..ff09c0f25dd4 100644\n>> --- a/drivers/mtd/nand/atmel/pmecc.c\n>> +++ b/drivers/mtd/nand/atmel/pmecc.c\n>> @@ -765,6 +765,12 @@ void atmel_pmecc_get_generated_eccbytes(struct atmel_pmecc_user *user,\n>> }\n>> EXPORT_SYMBOL_GPL(atmel_pmecc_get_generated_eccbytes);\n>>\n>> +void atmel_pmecc_reset(struct atmel_pmecc *pmecc)\n>> +{\n>> + writel(PMECC_CTRL_RST, pmecc->regs.base + ATMEL_PMECC_CTRL);\n>> + writel(PMECC_CTRL_DISABLE, pmecc->regs.base + ATMEL_PMECC_CTRL);\n>> +}\n>\n> It's not used outside of this file, so it should have a static\n> specifier. Anyway, I wonder why you don't expose atmel_pmecc_reset()\n> directly instead of creating this atmel_pmecc_resume() wrapper.\n\nI will fix this...","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org; spf=none (mailfrom)\n\tsmtp.mailfrom=lists.infradead.org (client-ip=65.50.211.133;\n\thelo=bombadil.infradead.org;\n\tenvelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"d+lSD4OZ\"; \n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tsecure) header.d=mobile-devices.fr header.i=@mobile-devices.fr\n\theader.b=\"PqMvXj7D\"; \n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"IHEf9Po7\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y2MKD3Gxtz9t3m\n\tfor ;\n\tThu, 28 Sep 2017 01:33:04 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dxEKX-00079y-8a; 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