From patchwork Thu Aug 17 09:45:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huangzheng Lai X-Patchwork-Id: 714479 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 AFF48C41513 for ; Thu, 17 Aug 2023 09:47:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349782AbjHQJq6 (ORCPT ); Thu, 17 Aug 2023 05:46:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46564 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349835AbjHQJqx (ORCPT ); Thu, 17 Aug 2023 05:46:53 -0400 Received: from SHSQR01.spreadtrum.com (unknown [222.66.158.135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90CEA2D61; Thu, 17 Aug 2023 02:46:51 -0700 (PDT) Received: from dlp.unisoc.com ([10.29.3.86]) by SHSQR01.spreadtrum.com with ESMTP id 37H9kJn8085390; Thu, 17 Aug 2023 17:46:19 +0800 (+08) (envelope-from Huangzheng.Lai@unisoc.com) Received: from SHDLP.spreadtrum.com (shmbx04.spreadtrum.com [10.0.1.214]) by dlp.unisoc.com (SkyGuard) with ESMTPS id 4RRKpH1kdPz2P3khb; Thu, 17 Aug 2023 17:44:07 +0800 (CST) Received: from xm9614pcu.spreadtrum.com (10.13.2.29) by shmbx04.spreadtrum.com (10.0.1.214) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Thu, 17 Aug 2023 17:46:17 +0800 From: Huangzheng Lai To: Andi Shyti CC: Orson Zhai , Baolin Wang , Chunyan Zhang , , , huangzheng lai , Huangzheng Lai , Xiongpeng Wu Subject: [PATCH 4/8] i2c: sprd: Add IIC controller driver to support dynamic switching of 400K/1M/3.4M frequency Date: Thu, 17 Aug 2023 17:45:16 +0800 Message-ID: <20230817094520.21286-5-Huangzheng.Lai@unisoc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230817094520.21286-1-Huangzheng.Lai@unisoc.com> References: <20230817094520.21286-1-Huangzheng.Lai@unisoc.com> MIME-Version: 1.0 X-Originating-IP: [10.13.2.29] X-ClientProxiedBy: SHCAS03.spreadtrum.com (10.0.1.207) To shmbx04.spreadtrum.com (10.0.1.214) X-MAIL: SHSQR01.spreadtrum.com 37H9kJn8085390 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org When IIC-slaves supporting different frequencies use the same IIC controller, the IIC controller usually only operates at lower frequencies. In order to improve the performance of IIC-slaves transmission supporting faster frequencies, we dynamically configure the IIC operating frequency based on the value of the input parameter msg ->flag. Signed-off-by: Huangzheng Lai --- drivers/i2c/busses/i2c-sprd.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c index 549b60dd3273..02c11a9ff2da 100644 --- a/drivers/i2c/busses/i2c-sprd.c +++ b/drivers/i2c/busses/i2c-sprd.c @@ -75,7 +75,14 @@ #define SPRD_I2C_PM_TIMEOUT 1000 /* timeout (ms) for transfer message */ #define I2C_XFER_TIMEOUT 1000 - +/* dynamic modify clk_freq flag */ +#define I2C_3M4_FLAG 0x0100 +#define I2C_1M_FLAG 0x0080 +#define I2C_400K_FLAG 0x0040 + +#define I2C_FREQ_400K 400000 +#define I2C_FREQ_1M 1000000 +#define I2C_FREQ_3_4M 3400000 /* SPRD i2c data structure */ struct sprd_i2c { struct i2c_adapter adap; @@ -94,6 +101,8 @@ struct sprd_i2c { int err; }; +static void sprd_i2c_set_clk(struct sprd_i2c *i2c_dev, u32 freq); + static void sprd_i2c_set_count(struct sprd_i2c *i2c_dev, u32 count) { writel(count, i2c_dev->base + I2C_COUNT); @@ -269,6 +278,12 @@ static int sprd_i2c_handle_msg(struct i2c_adapter *i2c_adap, sprd_i2c_send_stop(i2c_dev, !!is_last_msg); } + if (msg->flags & I2C_400K_FLAG) + sprd_i2c_set_clk(i2c_dev, I2C_FREQ_400K); + else if (msg->flags & I2C_1M_FLAG) + sprd_i2c_set_clk(i2c_dev, I2C_FREQ_1M); + else if (msg->flags & I2C_3M4_FLAG) + sprd_i2c_set_clk(i2c_dev, I2C_FREQ_3_4M); /* * We should enable rx fifo full interrupt to get data when receiving * full data.