From patchwork Thu Aug 18 14:33:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marco Felsch X-Patchwork-Id: 12947244 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 83B0EC32772 for ; Thu, 18 Aug 2022 14:35:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245504AbiHROfH (ORCPT ); Thu, 18 Aug 2022 10:35:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343604AbiHROeJ (ORCPT ); Thu, 18 Aug 2022 10:34:09 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8580FD1 for ; Thu, 18 Aug 2022 07:33:54 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1oOgaJ-0005lR-Kg; Thu, 18 Aug 2022 16:33:23 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1oOgaI-000X15-PW; Thu, 18 Aug 2022 16:33:22 +0200 Received: from mfe by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1oOgaH-0043dR-2W; Thu, 18 Aug 2022 16:33:21 +0200 From: Marco Felsch To: mchehab@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, vkoul@kernel.org, kishon@ti.com, sakari.ailus@linux.intel.com, hverkuil@xs4all.nl, jacopo@jmondi.org, laurent.pinchart+renesas@ideasonboard.com Cc: linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-media@vger.kernel.org, kernel@pengutronix.de Subject: [PATCH 2/4] phy: dphy: add support to calculate the timing based on hs_clk_rate Date: Thu, 18 Aug 2022 16:33:05 +0200 Message-Id: <20220818143307.967150-3-m.felsch@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220818143307.967150-1-m.felsch@pengutronix.de> References: <20220818143307.967150-1-m.felsch@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: mfe@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-media@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org For MIPI-CSI sender use-case it is common to specify the allowed link-frequencies which should be used for the MIPI link and is half the hs-clock rate. This commit adds a helper to calculate the D-PHY timing based on the hs-clock rate so we don't need to calculate the timings within the driver. Signed-off-by: Marco Felsch Acked-By: Vinod Koul --- drivers/phy/phy-core-mipi-dphy.c | 22 ++++++++++++++++++---- include/linux/phy/phy-mipi-dphy.h | 3 +++ 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/phy/phy-core-mipi-dphy.c b/drivers/phy/phy-core-mipi-dphy.c index ba365bc77407..f4956a417a47 100644 --- a/drivers/phy/phy-core-mipi-dphy.c +++ b/drivers/phy/phy-core-mipi-dphy.c @@ -20,16 +20,18 @@ static int phy_mipi_dphy_calc_config(unsigned long pixel_clock, unsigned int bpp, unsigned int lanes, + unsigned long long hs_clk_rate, struct phy_configure_opts_mipi_dphy *cfg) { - unsigned long long hs_clk_rate; unsigned long long ui; if (!cfg) return -EINVAL; - hs_clk_rate = pixel_clock * bpp; - do_div(hs_clk_rate, lanes); + if (!hs_clk_rate) { + hs_clk_rate = pixel_clock * bpp; + do_div(hs_clk_rate, lanes); + } ui = ALIGN(PSEC_PER_SEC, hs_clk_rate); do_div(ui, hs_clk_rate); @@ -81,11 +83,23 @@ int phy_mipi_dphy_get_default_config(unsigned long pixel_clock, unsigned int lanes, struct phy_configure_opts_mipi_dphy *cfg) { - return phy_mipi_dphy_calc_config(pixel_clock, bpp, lanes, cfg); + return phy_mipi_dphy_calc_config(pixel_clock, bpp, lanes, 0, cfg); } EXPORT_SYMBOL(phy_mipi_dphy_get_default_config); +int phy_mipi_dphy_get_default_config_for_hsclk(unsigned long long hs_clk_rate, + unsigned int lanes, + struct phy_configure_opts_mipi_dphy *cfg) +{ + if (!hs_clk_rate) + return -EINVAL; + + return phy_mipi_dphy_calc_config(0, 0, lanes, hs_clk_rate, cfg); + +} +EXPORT_SYMBOL(phy_mipi_dphy_get_default_config_for_hsclk); + /* * Validate D-PHY configuration according to MIPI D-PHY specification * (v1.2, Section Section 6.9 "Global Operation Timing Parameters"). diff --git a/include/linux/phy/phy-mipi-dphy.h b/include/linux/phy/phy-mipi-dphy.h index a877ffee845d..1ac128d78dfe 100644 --- a/include/linux/phy/phy-mipi-dphy.h +++ b/include/linux/phy/phy-mipi-dphy.h @@ -279,6 +279,9 @@ int phy_mipi_dphy_get_default_config(unsigned long pixel_clock, unsigned int bpp, unsigned int lanes, struct phy_configure_opts_mipi_dphy *cfg); +int phy_mipi_dphy_get_default_config_for_hsclk(unsigned long long hs_clk_rate, + unsigned int lanes, + struct phy_configure_opts_mipi_dphy *cfg); int phy_mipi_dphy_config_validate(struct phy_configure_opts_mipi_dphy *cfg); #endif /* __PHY_MIPI_DPHY_H_ */