From patchwork Thu Feb 1 06:13:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Devyn Liu X-Patchwork-Id: 769015 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (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 238B986ADB for ; Thu, 1 Feb 2024 06:17:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706768276; cv=none; b=s6/99x1OBCFUIuXYWLZtyEKCj7ydE1BfnEFZYJHvKM2je67yl0E4FuU4cQwIp7hUBA6kpElpgA5RdWXbLnGtI0VpJByJzTn5l+E+1ICHiLZQRNadLTvnK1xBC27uNJ7l+oRx9sOAjzweYUm8456ygYQ/Fbv9v8uPPx7biHB4Uns= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706768276; c=relaxed/simple; bh=m6UQU0p5vuahi+wb5trnZi6E8jgi6e2HKgEb3NV9pZk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=FaqmwhximDogwMIY2ccqIWwLuyyXOWhQ7O9yVOYO7Nru3PJzeGdT7YK05IlNLJH3frlKA0/o0MFtJYicVxk/xzIlrNhGtjZUnb2i2M114VkN+CLf8EhGCle3khNdPN00EMsLbRXf5c4c3QExI4NZcnEMd9XpGBmNNYHkLyV8/r0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.191 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.112]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4TQT9W4N1gz1FK4q; Thu, 1 Feb 2024 14:13:19 +0800 (CST) Received: from kwepemm600002.china.huawei.com (unknown [7.193.23.29]) by mail.maildlp.com (Postfix) with ESMTPS id 8993E14040F; Thu, 1 Feb 2024 14:17:49 +0800 (CST) Received: from localhost.localdomain (10.67.165.2) by kwepemm600002.china.huawei.com (7.193.23.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 1 Feb 2024 14:17:49 +0800 From: Devyn Liu To: CC: , , , , Subject: [PATCH v2 1/2] i2c: hisi: Optimized the value setting of maxwrite limit to fifo depth - 1 Date: Thu, 1 Feb 2024 14:13:44 +0800 Message-ID: <20240201061345.3111600-2-liudingyuan@huawei.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20240201061345.3111600-1-liudingyuan@huawei.com> References: <20240201061345.3111600-1-liudingyuan@huawei.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemm600002.china.huawei.com (7.193.23.29) The driver finishs a write cycle by read the fifo tx full status or write limit decrease to 0. The driver starts to write data to the FIFO after the I2C FIFO almost empty interrupt is reported. The threshold for FIFO almost empty interrupt is that the amount of data in the FIFO is less than or equal to 1. Reduce write maxwrite to the fifo depth - aempty interrupt threshold. Limiting the number of data to be written at a time to remaining fifo capacity. Signed-off-by: Devyn Liu Reviewed-by: Yicong Yang Reviewed-by: Andi Shyti Reviewed-by: Yicong Yang Reviewed-by: Andi Shyti --- drivers/i2c/busses/i2c-hisi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c index dfad5bad5075..cd37053362ee 100644 --- a/drivers/i2c/busses/i2c-hisi.c +++ b/drivers/i2c/busses/i2c-hisi.c @@ -266,7 +266,7 @@ static int hisi_i2c_read_rx_fifo(struct hisi_i2c_controller *ctlr) static void hisi_i2c_xfer_msg(struct hisi_i2c_controller *ctlr) { - int max_write = HISI_I2C_TX_FIFO_DEPTH; + int max_write = HISI_I2C_TX_FIFO_DEPTH - HISI_I2C_TX_F_AE_THRESH; bool need_restart = false, last_msg; struct i2c_msg *cur_msg; u32 cmd, fifo_state;