From patchwork Mon Jul 31 13:24:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 708635 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 75A18C00528 for ; Mon, 31 Jul 2023 13:25:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233008AbjGaNZt (ORCPT ); Mon, 31 Jul 2023 09:25:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232988AbjGaNZn (ORCPT ); Mon, 31 Jul 2023 09:25:43 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A497170C; Mon, 31 Jul 2023 06:25:36 -0700 (PDT) Received: from [127.0.1.1] (91-154-35-171.elisa-laajakaista.fi [91.154.35.171]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 299B5E79; Mon, 31 Jul 2023 15:24:26 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1690809866; bh=YclCu9MWxI1RLNahbDvt0bUIxt4jnTE0SQ6Uw7/PHgk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=haxec1VanzgITfRb+YEitnEb+GWf8YVElPmzQY5poulc/uHyq4INVQAWcUnY0zhQ1 j5rvi+kW0xiCUdT+KtE5vh7v2CprEAqyNyQtGI4wVaIioRsve9bkbdXhSYNUNEiSvM /Kx7jAiXL6fkh4h5Lq4W1jGFabp1VlpuiTxNSwLE= From: Tomi Valkeinen Date: Mon, 31 Jul 2023 16:24:41 +0300 Subject: [PATCH v3 7/9] media: i2c: ds90ub953: Restructure clkout management MIME-Version: 1.0 Message-Id: <20230731-fpdlink-additions-v3-7-8acfc49c215a@ideasonboard.com> References: <20230731-fpdlink-additions-v3-0-8acfc49c215a@ideasonboard.com> In-Reply-To: <20230731-fpdlink-additions-v3-0-8acfc49c215a@ideasonboard.com> To: Mauro Carvalho Chehab , Luca Ceresoli , Andy Shevchenko , Laurent Pinchart , Sakari Ailus , Hans Verkuil , Satish Nagireddy , Matti Vaittinen Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Tomi Valkeinen X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=6404; i=tomi.valkeinen@ideasonboard.com; h=from:subject:message-id; bh=YclCu9MWxI1RLNahbDvt0bUIxt4jnTE0SQ6Uw7/PHgk=; b=owEBbQKS/ZANAwAIAfo9qoy8lh71AcsmYgBkx7ZAG3xYVxOm16pm5AQBuD2QxklzuzG6HPmir eLryUajVSuJAjMEAAEIAB0WIQTEOAw+ll79gQef86f6PaqMvJYe9QUCZMe2QAAKCRD6PaqMvJYe 9Ur7D/9qZQ5TcwVXsxkQtEkVL35DXgkSPfkSlgEN9YM1LVPtLuTNfQBze5BXybI8EsvNtCr6qln xPJCmUGMSAgfxRkJq26c0F8SwGgdkwQ3j3JY+ZMJjutIVV4GVZpbUJkFPWJtTP8aXmKSfHlsmDB 8WqlxS6Xp3WjIZa1esT3S3CWVYjVGBQOFEooFRs2ZlnrsL1jYulzb0ihYaxZ/v8l+7k2TVhlqdJ Ep5zUCaeooP0dmb0p0U+SbtI/T3B/UAYtECRzFh8K9AYJ96KdloODxdgYelAuUYhe5v/2TxO5vC 1ZmnDVwNJKM6uDtZIg1gjHSjH3KIOY+eBOolY7OFFLlEXOvO3zyCjRw8WE1JejFSjwvB7EeZLGl eu2/bLa0orAuJvkLObHHRzbqtfyUKv5MKV0wGUeVIAeps6OE7nJJGi6VDZ8oSkxAyYFOe6lw3Ti b2RttYQ/bKlJmwIubsq1cwSY1QzsEJArzI9BEz8cDxKSr/126Xh6cAmYHjCA9LUYajbFjlquWHe wuV/0gtjfQs9yXqlPj8sJGzCiAsHlmdG+nEjJjMt1j7Jw7t+AHs/dzKWEqsXYo00/tFqiQh1Txl k8XJZSpb9bpXh3g4s7KWYHPvDgkj6Ho2kMBBNrYUuCAYuTIycLncOGi6o/ALdb1PtIqpibpsdQd S8lExH1fwu/2ToQ== X-Developer-Key: i=tomi.valkeinen@ideasonboard.com; a=openpgp; fpr=C4380C3E965EFD81079FF3A7FA3DAA8CBC961EF5 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Separate clkout calculations and register writes into two functions: ub953_calc_clkout_params and ub953_write_clkout_regs, and add a struct ub953_clkout_data that is used to store the clkout parameters. This simplifies the clkout management. Signed-off-by: Tomi Valkeinen Reviewed-by: Laurent Pinchart --- drivers/media/i2c/ds90ub953.c | 141 +++++++++++++++++++++++------------------- 1 file changed, 76 insertions(+), 65 deletions(-) diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c index eedbca986928..e1bd33e91eff 100644 --- a/drivers/media/i2c/ds90ub953.c +++ b/drivers/media/i2c/ds90ub953.c @@ -34,6 +34,8 @@ #define UB953_NUM_GPIOS 4 +#define UB953_DEFAULT_CLKOUT_RATE 25000000UL + #define UB953_REG_RESET_CTL 0x01 #define UB953_REG_RESET_CTL_DIGITAL_RESET_1 BIT(1) #define UB953_REG_RESET_CTL_DIGITAL_RESET_0 BIT(0) @@ -131,6 +133,13 @@ struct ub953_hw_data { bool is_ub971; }; +struct ub953_clkout_data { + u32 hs_div; + u32 m; + u32 n; + unsigned long rate; +}; + struct ub953_data { const struct ub953_hw_data *hw_data; @@ -906,6 +915,62 @@ static unsigned long ub953_calc_clkout_ub971(struct ub953_data *priv, return res; } +static void ub953_calc_clkout_params(struct ub953_data *priv, + unsigned long target_rate, + struct ub953_clkout_data *clkout_data) +{ + struct device *dev = &priv->client->dev; + unsigned long clkout_rate; + u64 fc_rate; + + fc_rate = ub953_get_fc_rate(priv); + + if (priv->hw_data->is_ub971) { + u8 m, n; + + clkout_rate = ub953_calc_clkout_ub971(priv, target_rate, + fc_rate, &m, &n); + + clkout_data->m = m; + clkout_data->n = n; + + dev_dbg(dev, "%s %llu * %u / (8 * %u) = %lu (requested %lu)", + __func__, fc_rate, m, n, clkout_rate, target_rate); + } else { + u8 hs_div, m, n; + + clkout_rate = ub953_calc_clkout_ub953(priv, target_rate, + fc_rate, &hs_div, &m, &n); + + clkout_data->hs_div = hs_div; + clkout_data->m = m; + clkout_data->n = n; + + dev_dbg(dev, "%s %llu / %u * %u / %u = %lu (requested %lu)", + __func__, fc_rate, hs_div, m, n, clkout_rate, + target_rate); + } + + clkout_data->rate = clkout_rate; +} + +static void ub953_write_clkout_regs(struct ub953_data *priv, + const struct ub953_clkout_data *clkout_data) +{ + u8 clkout_ctrl0, clkout_ctrl1; + + if (priv->hw_data->is_ub971) + clkout_ctrl0 = clkout_data->m; + else + clkout_ctrl0 = (__ffs(clkout_data->hs_div) << 5) | + clkout_data->m; + + clkout_ctrl1 = clkout_data->n; + + ub953_write(priv, UB953_REG_CLKOUT_CTRL0, clkout_ctrl0); + ub953_write(priv, UB953_REG_CLKOUT_CTRL1, clkout_ctrl1); +} + static unsigned long ub953_clkout_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { @@ -965,52 +1030,25 @@ static long ub953_clkout_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *parent_rate) { struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw); - struct device *dev = &priv->client->dev; - unsigned long res; - u64 fc_rate; - u8 hs_div, m, n; - - fc_rate = ub953_get_fc_rate(priv); - - if (priv->hw_data->is_ub971) { - res = ub953_calc_clkout_ub971(priv, rate, fc_rate, &m, &n); + struct ub953_clkout_data clkout_data; - dev_dbg(dev, "%s %llu * %u / (8 * %u) = %lu (requested %lu)", - __func__, fc_rate, m, n, res, rate); - } else { - res = ub953_calc_clkout_ub953(priv, rate, fc_rate, &hs_div, &m, &n); + ub953_calc_clkout_params(priv, rate, &clkout_data); - dev_dbg(dev, "%s %llu / %u * %u / %u = %lu (requested %lu)", - __func__, fc_rate, hs_div, m, n, res, rate); - } - - return res; + return clkout_data.rate; } static int ub953_clkout_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw); - u64 fc_rate; - u8 hs_div, m, n; - unsigned long res; + struct ub953_clkout_data clkout_data; - fc_rate = ub953_get_fc_rate(priv); + ub953_calc_clkout_params(priv, rate, &clkout_data); - if (priv->hw_data->is_ub971) { - res = ub953_calc_clkout_ub971(priv, rate, fc_rate, &m, &n); + dev_dbg(&priv->client->dev, "%s %lu (requested %lu)\n", __func__, + clkout_data.rate, rate); - ub953_write(priv, UB953_REG_CLKOUT_CTRL0, m); - ub953_write(priv, UB953_REG_CLKOUT_CTRL1, n); - } else { - res = ub953_calc_clkout_ub953(priv, rate, fc_rate, &hs_div, &m, &n); - - ub953_write(priv, UB953_REG_CLKOUT_CTRL0, (__ffs(hs_div) << 5) | m); - ub953_write(priv, UB953_REG_CLKOUT_CTRL1, n); - } - - dev_dbg(&priv->client->dev, "%s %lu (requested %lu)\n", __func__, res, - rate); + ub953_write_clkout_regs(priv, &clkout_data); return 0; } @@ -1021,32 +1059,6 @@ static const struct clk_ops ub953_clkout_ops = { .set_rate = ub953_clkout_set_rate, }; -static void ub953_init_clkout_ub953(struct ub953_data *priv) -{ - u64 fc_rate; - u8 hs_div, m, n; - - fc_rate = ub953_get_fc_rate(priv); - - ub953_calc_clkout_ub953(priv, 25000000, fc_rate, &hs_div, &m, &n); - - ub953_write(priv, UB953_REG_CLKOUT_CTRL0, (__ffs(hs_div) << 5) | m); - ub953_write(priv, UB953_REG_CLKOUT_CTRL1, n); -} - -static void ub953_init_clkout_ub971(struct ub953_data *priv) -{ - u64 fc_rate; - u8 m, n; - - fc_rate = ub953_get_fc_rate(priv); - - ub953_calc_clkout_ub971(priv, 25000000, fc_rate, &m, &n); - - ub953_write(priv, UB953_REG_CLKOUT_CTRL0, m); - ub953_write(priv, UB953_REG_CLKOUT_CTRL1, n); -} - static int ub953_register_clkout(struct ub953_data *priv) { struct device *dev = &priv->client->dev; @@ -1055,16 +1067,15 @@ static int ub953_register_clkout(struct ub953_data *priv) priv->hw_data->model, dev_name(dev)), .ops = &ub953_clkout_ops, }; + struct ub953_clkout_data clkout_data; int ret; if (!init.name) return -ENOMEM; /* Initialize clkout to 25MHz by default */ - if (priv->hw_data->is_ub971) - ub953_init_clkout_ub971(priv); - else - ub953_init_clkout_ub953(priv); + ub953_calc_clkout_params(priv, UB953_DEFAULT_CLKOUT_RATE, &clkout_data); + ub953_write_clkout_regs(priv, &clkout_data); priv->clkout_clk_hw.init = &init;