From nobody Fri Dec 19 04:52:38 2025 Received: from relay2-d.mail.gandi.net (relay2-d.mail.gandi.net [217.70.183.194]) (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 C05CB41C64 for ; Thu, 19 Dec 2024 14:58:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734620303; cv=none; b=XAoQtT9El0/1YyNPOne5XOipRtr3aKQ0UFx9O/S9aNh//ZE8v1FNW+/xd0isfQLomhFWtSCSazduzSSeUrljF2d77UKQYGZX9qYPOHCV6u2w+hTj56VU85WBhE6Tf5lYgAWHC8hYRFC9lEX6w/lCempkWgniL2hIi29I7W5Tt5U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734620303; c=relaxed/simple; bh=XeMFVC0QILUnqKqDB/rlC5w9oMQxbkCElaOGJ4aQXyc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=sDIW6CWcWTNnRjbScCz9aH5RpokLV4OSRv7fJ7UM0vJfGTfWVnn6Bd8wiQsZqBJsTH0U2nGX82AT1eIHIGp7aEqmI+sdZnJ4aJhlv+g93jNqljJUO+1a0sNR8XNopRsJDMi3QAT5L581XqpXdEwHLxFyggByxcFEObknCbHmzKU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=L/AEeElV; arc=none smtp.client-ip=217.70.183.194 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="L/AEeElV" Received: by mail.gandi.net (Postfix) with ESMTPSA id 2093B40005; Thu, 19 Dec 2024 14:58:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1734620293; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=mWYUstccGxYLPvPQO9w2QnpqTpWw5Kx8+nrdOLymIbs=; b=L/AEeElVt1WMFTe1n7q4hn/HltSDaf8rKXjDJN1RY7K1zwxRjpRMwvVz2dOkqArWvfA8aD hZNkF+XAjfda6t0xCCwqRG5XXZfR5hVHRhdi2n8guRdNaL6rFhdGUxnd64SWJQaTE79dHh BQ9UdlSPQqEn2kkF2Dic8MaDwpT/2H9ocou2Zb/ahGf9lk0PwS3b7Zck/bvmAAnjUn0pAy y9sky9tEDcDX4wa659WWlqrWPNVSp+hAuXYhIw7wzTCndCCCWf2BFd7qitDUBejk8kGgzu 3gyEA6mgET7J6dXNlAtnyfOJENKnOLClmZY/vk3i+wypfPfvJYhivmF9Mg8qaA== From: Bastien Curutchet Date: Thu, 19 Dec 2024 15:58:10 +0100 Subject: [PATCH v2] mtd: rawnand: davinci: Reduce polling interval in NAND_OP_WAITRDY_INSTR 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: <20241219-patch-nand-poll-v2-1-cc80a1ee4e0f@bootlin.com> X-B4-Tracking: v=1; b=H4sIAIE0ZGcC/3WNQQ6CMBBFr0Jm7RhmQmt05T0Mi1IGmQRb0hKiI dzdyt7le8l/f4MsSSXDrdogyapZYyjApwr86MJTUPvCwDU3xHTF2S1+xOBCj3OcJuyYzMVacbV jKKs5yaDvo/hoC4+al5g+x8FKP/u/tRIS2tqIGcgM3Lh7F+MyaTj7+IJ23/cvgeYp7LAAAAA= X-Change-ID: 20241219-patch-nand-poll-b215766ea0a2 To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, Thomas Petazzoni , Herve Codina , Bastien Curutchet , Christopher Cordahi X-Mailer: b4 0.14.2 X-GND-Sasl: bastien.curutchet@bootlin.com For each NAND_OP_WAITRDY_INSTR operation, the NANDFSR register is polled only once every 100 us to check for the EMA_WAIT pin. This isn't frequent enough and causes delays in NAND accesses. Set the polling interval to 0s. It increases the page read speed reported by flash_speed by ~40% (~30% on page writes). Signed-off-by: Bastien Curutchet --- Changes in v2: - Fix SOB. - Link to v1: https://lore.kernel.org/r/20241219-patch-nand-poll-v1-1-605e5= f15f24a@bootlin.com --- drivers/mtd/nand/raw/davinci_nand.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/nand/raw/davinci_nand.c b/drivers/mtd/nand/raw/dav= inci_nand.c index 1f8354acfb50b2f4d155cdfc03afcf2863539f66..b3fe6f62bb3bd6a51da891c604d= 38142055ab1d3 100644 --- a/drivers/mtd/nand/raw/davinci_nand.c +++ b/drivers/mtd/nand/raw/davinci_nand.c @@ -724,7 +724,7 @@ static int davinci_nand_exec_instr(struct davinci_nand_= info *info, case NAND_OP_WAITRDY_INSTR: timeout_us =3D instr->ctx.waitrdy.timeout_ms * 1000; ret =3D readl_relaxed_poll_timeout(info->base + NANDFSR_OFFSET, - status, status & BIT(0), 100, + status, status & BIT(0), 0, timeout_us); if (ret) return ret; --- base-commit: 40384c840ea1944d7c5a392e8975ed088ecf0b37 change-id: 20241219-patch-nand-poll-b215766ea0a2 Best regards, --=20 Bastien Curutchet