From nobody Tue Feb 10 06:43:14 2026 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 02A1A1DA11B for ; Mon, 2 Dec 2024 16:35:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733157344; cv=none; b=TxiXaen/FKyQNW4hp4rf56aPEwgiW+w1mCA3EYP0Uaah/JznPwarvbcfbh0l47DsO0f4wjyNLJjfgnesTxvpjI35yoJAAzSKyq1+SwbjIMO5iZBrstsCI1IikVVUEZQ/OTeMpBTTstmnZs1xqCm/cwce7r0DZMzQ8W6uMd2xcEg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733157344; c=relaxed/simple; bh=vzVYWqRuvJ/DR32lne+6U8YOTfeeJ6uP4kuNCyeLjfI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=okbrkVcK7iO9s6w7Rwhsj7raDcukFeqbz4yy+zKTfdu8bFHUAeNJgZ/qHN/IuW44QHKu/hhndsAwWfx7Fk9V+gkJqLa2+eyNaj/DsCT/eLZQMRHI9uEelwBfn+qgrF7gZgKBbHUeoMsoIf9AwXzsn84bvD9m/HLcw0ff05LiZ2U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from dude04.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::ac]) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1tI9Od-0004Mi-5y; Mon, 02 Dec 2024 17:35:39 +0100 From: Jonas Rebmann Date: Mon, 02 Dec 2024 17:35:20 +0100 Subject: [PATCH 1/3] mtd: mchp48l640: make WEL behaviour configurable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241202-mb85rs128ty-v1-1-a660b6490dc8@pengutronix.de> References: <20241202-mb85rs128ty-v1-0-a660b6490dc8@pengutronix.de> In-Reply-To: <20241202-mb85rs128ty-v1-0-a660b6490dc8@pengutronix.de> To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Schocher Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, David Jander , kernel@pengutronix.de, Jonas Rebmann X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1701; i=jre@pengutronix.de; h=from:subject:message-id; bh=YnwbiJO7X9hCHNnU39mclSYSZ2iVlKIANZV6k28zZuk=; b=owGbwMvMwCF2ZcYT3onnbjcwnlZLYkj3fXiTQyJWdanbbz0NQ9+fXg7zEnbl5J62kLRiYXDYn nKsN3pvRykLgxgHg6yYIkusmpyCkLH/dbNKu1iYOaxMIEMYuDgFYCJ9Hxh+MX/JexrEXuhscKij ZjdLEb9oXd1ayUNHt1yf2HNf/qL+AkaGe/ODy2ZNWvgk/dKuZ/KiL0UWtm1b4dm+bs11ic/7tdR vcgMA X-Developer-Key: i=jre@pengutronix.de; a=openpgp; fpr=0B7B750D5D3CD21B3B130DE8B61515E135CD49B5 X-SA-Exim-Connect-IP: 2a0a:edc0:0:1101:1d::ac X-SA-Exim-Mail-From: jre@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org From: David Jander The 48L640 resets the WEL bit (the Write Enable Latch bit in the status register) to zero on the completion of write operations. In preparation to support chips behaving differently, introduce .auto_disable_wel capability, and, if it's missing, explicitly reset the WEL bit after writes. Signed-off-by: David Jander Signed-off-by: Jonas Rebmann --- drivers/mtd/devices/mchp48l640.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/devices/mchp48l640.c b/drivers/mtd/devices/mchp48l= 640.c index f576e6a890e859e7d20aeeb2ede4ca0acf4850fc..4cdd24aaed416fc7e40a8060b5c= 7eaf6684fc6d5 100644 --- a/drivers/mtd/devices/mchp48l640.c +++ b/drivers/mtd/devices/mchp48l640.c @@ -27,6 +27,7 @@ struct mchp48_caps { unsigned int size; unsigned int page_size; + bool auto_disable_wel; }; =20 struct mchp48l640_flash { @@ -194,9 +195,15 @@ static int mchp48l640_write_page(struct mtd_info *mtd,= loff_t to, size_t len, else goto fail; =20 - ret =3D mchp48l640_waitforbit(flash, MCHP48L640_STATUS_WEL, false); - if (ret) - goto fail; + if (flash->caps->auto_disable_wel) { + ret =3D mchp48l640_waitforbit(flash, MCHP48L640_STATUS_WEL, false); + if (ret) + goto fail; + } else { + ret =3D mchp48l640_write_prepare(flash, false); + if (ret) + goto fail; + } =20 kfree(cmd); return 0; @@ -293,6 +300,7 @@ static int mchp48l640_read(struct mtd_info *mtd, loff_t= from, size_t len, static const struct mchp48_caps mchp48l640_caps =3D { .size =3D SZ_8K, .page_size =3D 32, + .auto_disable_wel =3D true, }; =20 static int mchp48l640_probe(struct spi_device *spi) --=20 2.39.5