From patchwork Mon Mar 4 07:29:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Oltmanns X-Patchwork-Id: 13580126 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 491F2C48BF6 for ; Mon, 4 Mar 2024 07:30:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7953510FDA9; Mon, 4 Mar 2024 07:30:22 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=oltmanns.dev header.i=@oltmanns.dev header.b="rfl0fOro"; dkim-atps=neutral Received: from mout-p-201.mailbox.org (mout-p-201.mailbox.org [80.241.56.171]) by gabe.freedesktop.org (Postfix) with ESMTPS id 92DCB10FDA9 for ; Mon, 4 Mar 2024 07:30:20 +0000 (UTC) Received: from smtp102.mailbox.org (smtp102.mailbox.org [10.196.197.102]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-201.mailbox.org (Postfix) with ESMTPS id 4Tp9MY4Xxbz9t8K; Mon, 4 Mar 2024 08:30:17 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oltmanns.dev; s=MBO0001; t=1709537417; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ugKhzTVt1AcqmTVj4/zhKrifJsgXqt3bG4BPHQ/PtEk=; b=rfl0fOroTEroDocPQFaoCLIp8MH7SRryewSU2SeoF5LuO+v0uGb2oGTqGN7JU+4LqXvKaM qS8fQapsw+tvDZ+JmF07+E8GVba2zWho71dbSmuQTfgIPxKJpj1N7jImLKRxgDOrJ2G8ah UOPBQ3lpleNEmtQ01Xg25znZbNwkuKOzwSEDOGf6VftJrL5I6s2HVwlps+6dEcQOwL3uCl zOZrZO35uB4xtgU6CjGtq9oeGmP4ZA4UrJmqpzw7j7mS51qbwrlPgvLyLirULK4CvyDPHl Exf2aIQ/OAwyZElxkUegJ1Og8+XiI1loRvnPEzxW+SDA2muexUtZPjN5kfieig== From: Frank Oltmanns Date: Mon, 04 Mar 2024 08:29:19 +0100 Subject: [PATCH v3 3/5] clk: sunxi-ng: nkm: Support constraints on m/n ratio and parent rate MIME-Version: 1.0 Message-Id: <20240304-pinephone-pll-fixes-v3-3-94ab828f269a@oltmanns.dev> References: <20240304-pinephone-pll-fixes-v3-0-94ab828f269a@oltmanns.dev> In-Reply-To: <20240304-pinephone-pll-fixes-v3-0-94ab828f269a@oltmanns.dev> To: Michael Turquette , Stephen Boyd , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , =?utf-8?q?Guido_G=C3=BCnther?= , Purism Kernel Team , Ondrej Jirman , Neil Armstrong , Jessica Zhang , Sam Ravnborg , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, Frank Oltmanns X-Developer-Signature: v=1; a=openpgp-sha256; l=2581; i=frank@oltmanns.dev; h=from:subject:message-id; bh=sz8/RCE/mblTN6+mQB7r6nXbctInrDxt2wSc2tr+a2Q=; b=owEB7QES/pANAwAIAZppogiUStPHAcsmYgBl5XhwI0bCeru/1nlBW/G5cBW5Fv1lAQqsQfso4 Eq7T4NnpsCJAbMEAAEIAB0WIQQC/SV7f5DmuaVET5aaaaIIlErTxwUCZeV4cAAKCRCaaaIIlErT x+2jC/9GmU2LB9KQ8+Ht1upHBN6188WAGWTUcOUKTsaQRR0jAXDy1+eE7AoHXJTJAciU+uI4/B4 p6ie9RlS1UXiIAKWMqgSbZ7XMXnPhdz2ZB0T9mSjNQYi5PMlaHzoSwHeMUrtuYyIZvxobCiGITZ W3Io+7L18WdBOFEq9iIAtQkWWg4yNRRUlxYUxvkkOOlfdxTHmV+7ZYfPC57KRcDoU2WUVcr/whn 5AeLbd5LLQvfvv7RQCuKAkCNwAy3afi4HEXFTTCanfuj36s9TXrY4cHuW/DDAR37YcGFMcWZYId HFF7vz/QzwUvDnZlOAvxDOQR1jfmzLv/9k9Qs9z0S9xItTcDAN2fhRwuDRkz7FwpcUhnpkc9Npq G1m4k9K21huu4tLx9NbIBskqIfbd0GWOo/w6XYbd/ByAC3TWWu7htdthvMQFCsTSjwJ1FMKRj8Z iVuzy1SNN2EUTAFsfMTGnfOetrzOjt+HUZVuSh7HtcRtZKJlRtNLIiazpcoW/HTB/GNsE= X-Developer-Key: i=frank@oltmanns.dev; a=openpgp; fpr=02FD257B7F90E6B9A5444F969A69A208944AD3C7 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The Allwinner A64 manual lists the following constraints for the PLL-MIPI clock: - M/N <= 3 - (PLL_VIDEO0)/M >= 24MHz The PLL-MIPI clock is implemented as ccu_nkm. Therefore, add support for these constraints. Reviewed-by: Jernej Skrabec Signed-off-by: Frank Oltmanns --- drivers/clk/sunxi-ng/ccu_nkm.c | 21 +++++++++++++++++++++ drivers/clk/sunxi-ng/ccu_nkm.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c index 853f84398e2b..1168d894d636 100644 --- a/drivers/clk/sunxi-ng/ccu_nkm.c +++ b/drivers/clk/sunxi-ng/ccu_nkm.c @@ -16,6 +16,20 @@ struct _ccu_nkm { unsigned long m, min_m, max_m; }; +static bool ccu_nkm_is_valid_rate(struct ccu_common *common, unsigned long parent, + unsigned long n, unsigned long m) +{ + struct ccu_nkm *nkm = container_of(common, struct ccu_nkm, common); + + if (nkm->max_m_n_ratio && (m > nkm->max_m_n_ratio * n)) + return false; + + if (nkm->min_parent_m_ratio && (parent < nkm->min_parent_m_ratio * m)) + return false; + + return true; +} + static unsigned long ccu_nkm_find_best_with_parent_adj(struct ccu_common *common, struct clk_hw *parent_hw, unsigned long *parent, unsigned long rate, @@ -31,6 +45,10 @@ static unsigned long ccu_nkm_find_best_with_parent_adj(struct ccu_common *common unsigned long tmp_rate, tmp_parent; tmp_parent = clk_hw_round_rate(parent_hw, rate * _m / (_n * _k)); + + if (!ccu_nkm_is_valid_rate(common, tmp_parent, _n, _m)) + continue; + tmp_rate = tmp_parent * _n * _k / _m; if (ccu_is_better_rate(common, rate, tmp_rate, best_rate) || @@ -64,6 +82,9 @@ static unsigned long ccu_nkm_find_best(unsigned long parent, unsigned long rate, for (_k = nkm->min_k; _k <= nkm->max_k; _k++) { for (_n = nkm->min_n; _n <= nkm->max_n; _n++) { for (_m = nkm->min_m; _m <= nkm->max_m; _m++) { + if (!ccu_nkm_is_valid_rate(common, parent, _n, _m)) + continue; + unsigned long tmp_rate; tmp_rate = parent * _n * _k / _m; diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h index 6601defb3f38..c409212ee40e 100644 --- a/drivers/clk/sunxi-ng/ccu_nkm.h +++ b/drivers/clk/sunxi-ng/ccu_nkm.h @@ -27,6 +27,8 @@ struct ccu_nkm { struct ccu_mux_internal mux; unsigned int fixed_post_div; + unsigned long max_m_n_ratio; + unsigned long min_parent_m_ratio; struct ccu_common common; };