From patchwork Mon Nov 16 07:55:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Tretter X-Patchwork-Id: 11907647 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 547C7C4742C for ; Mon, 16 Nov 2020 08:05:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05E092222E for ; Mon, 16 Nov 2020 08:05:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728065AbgKPHzm (ORCPT ); Mon, 16 Nov 2020 02:55:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728054AbgKPHzl (ORCPT ); Mon, 16 Nov 2020 02:55:41 -0500 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 332F2C0613CF for ; Sun, 15 Nov 2020 23:55:41 -0800 (PST) Received: from [2a0a:edc0:0:1101:1d::39] (helo=dude03.red.stw.pengutronix.de) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1keZMO-0007YY-3u; Mon, 16 Nov 2020 08:55:38 +0100 Received: from mtr by dude03.red.stw.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1keZMN-00Grbl-1t; Mon, 16 Nov 2020 08:55:35 +0100 From: Michael Tretter To: linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org Cc: rajanv@xilinx.com, tejasp@xilinx.com, dshah@xilinx.com, rvisaval@xilinx.com, michals@xilinx.com, kernel@pengutronix.de, robh+dt@kernel.org, mturquette@baylibre.com, sboyd@kernel.org, Michael Tretter Date: Mon, 16 Nov 2020 08:55:29 +0100 Message-Id: <20201116075532.4019252-10-m.tretter@pengutronix.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116075532.4019252-1-m.tretter@pengutronix.de> References: <20201116075532.4019252-1-m.tretter@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:1101:1d::39 X-SA-Exim-Mail-From: mtr@pengutronix.de Subject: [PATCH 09/12] soc: xilinx: vcu: make pll post divider explicit X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) X-PTX-Original-Recipient: linux-clk@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org According to the downstream driver documentation due to timing constraints the output divider of the PLL has to be set to 1/2. Add a helper function for that check instead of burying the code in one large setup function. The bit is undocumented and marked as reserved in the register reference. Signed-off-by: Michael Tretter --- drivers/soc/xilinx/xlnx_vcu.c | 51 ++++++++++++++++++++++++----------- 1 file changed, 35 insertions(+), 16 deletions(-) diff --git a/drivers/soc/xilinx/xlnx_vcu.c b/drivers/soc/xilinx/xlnx_vcu.c index cedc8b7859f7..cf8456b4ef78 100644 --- a/drivers/soc/xilinx/xlnx_vcu.c +++ b/drivers/soc/xilinx/xlnx_vcu.c @@ -79,6 +79,7 @@ struct xvcu_device { struct regmap *logicore_reg_ba; void __iomem *vcu_slcr_ba; struct clk_hw *pll; + struct clk_hw *pll_post; struct clk_hw_onecell_data *clk_data; }; @@ -272,6 +273,28 @@ static int xvcu_pll_wait_for_lock(struct xvcu_device *xvcu) return -ETIMEDOUT; } +static struct clk_hw *xvcu_register_pll_post(struct device *dev, + const char *name, + const char *parent_name, + void __iomem *reg_base) +{ + u32 div; + u32 vcu_pll_ctrl; + + /* + * The output divider of the PLL must be set to 1/2 to meet the + * timing in the design. + */ + vcu_pll_ctrl = xvcu_read(reg_base, VCU_PLL_CTRL); + div = vcu_pll_ctrl >> VCU_PLL_CTRL_CLKOUTDIV_SHIFT; + div = div & VCU_PLL_CTRL_CLKOUTDIV_MASK; + if (div != 1) + return ERR_PTR(-EINVAL); + + return clk_hw_register_fixed_factor(dev, "vcu_pll_post", parent_name, + CLK_SET_RATE_PARENT, 1, 2); +} + static const struct xvcu_pll_cfg *xvcu_find_cfg(int div) { const struct xvcu_pll_cfg *cfg = NULL; @@ -400,7 +423,7 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) { u32 refclk, coreclk, mcuclk, inte, deci; u32 divisor_mcu, divisor_core, fvco; - u32 clkoutdiv, vcu_pll_ctrl, pll_clk; + u32 pll_clk; u32 mod; int i; int ret; @@ -423,19 +446,6 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) dev_dbg(xvcu->dev, "Core clock from logicoreIP is %uHz\n", coreclk); dev_dbg(xvcu->dev, "Mcu clock from logicoreIP is %uHz\n", mcuclk); - /* - * The divide-by-2 should be always enabled (==1) - * to meet the timing in the design. - * Otherwise, it's an error - */ - vcu_pll_ctrl = xvcu_read(xvcu->vcu_slcr_ba, VCU_PLL_CTRL); - clkoutdiv = vcu_pll_ctrl >> VCU_PLL_CTRL_CLKOUTDIV_SHIFT; - clkoutdiv = clkoutdiv & VCU_PLL_CTRL_CLKOUTDIV_MASK; - if (clkoutdiv != 1) { - dev_err(xvcu->dev, "clkoutdiv value is invalid\n"); - return -EINVAL; - } - for (i = ARRAY_SIZE(xvcu_pll_cfg) - 1; i >= 0; i--) { const struct xvcu_pll_cfg *cfg = &xvcu_pll_cfg[i]; @@ -482,7 +492,7 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) hw = clk_hw_register_fixed_rate(xvcu->dev, "vcu_pll", __clk_get_name(xvcu->pll_ref), - 0, pll_clk); + 0, fvco); if (IS_ERR(hw)) return PTR_ERR(hw); xvcu->pll = hw; @@ -609,6 +619,7 @@ static int xvcu_register_clock_provider(struct xvcu_device *xvcu) struct clk_hw *parent_default; struct clk_hw_onecell_data *data; struct clk_hw **hws; + struct clk_hw *hw; void __iomem *reg_base = xvcu->vcu_slcr_ba; data = devm_kzalloc(dev, struct_size(data, hws, CLK_XVCU_NUM_CLOCKS), GFP_KERNEL); @@ -619,7 +630,13 @@ static int xvcu_register_clock_provider(struct xvcu_device *xvcu) xvcu->clk_data = data; - parent_default = xvcu->pll; + hw = xvcu_register_pll_post(dev, "vcu_pll_post", + clk_hw_get_name(xvcu->pll), reg_base); + if (IS_ERR(hw)) + return PTR_ERR(hw); + xvcu->pll_post = hw; + + parent_default = xvcu->pll_post; parent_names[0] = "dummy"; parent_names[1] = clk_hw_get_name(parent_default); @@ -650,6 +667,8 @@ static void xvcu_unregister_clock_provider(struct xvcu_device *xvcu) xvcu_clk_hw_unregister_leaf(hws[CLK_XVCU_ENC_MCU]); if (!IS_ERR_OR_NULL(hws[CLK_XVCU_ENC_CORE])) xvcu_clk_hw_unregister_leaf(hws[CLK_XVCU_ENC_CORE]); + + clk_hw_unregister_fixed_factor(xvcu->pll_post); } /**