From patchwork Mon Jul 17 13:34:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Oltmanns X-Patchwork-Id: 13316465 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 mout-p-102.mailbox.org ([80.241.56.152]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qLONQ-0048VD-1J for linux-arm-kernel@lists.infradead.org; Mon, 17 Jul 2023 13:35:08 +0000 From: Frank Oltmanns Date: Mon, 17 Jul 2023 15:34:32 +0200 Subject: [PATCH v4 08/11] clk: sunxi-ng: nkm: Support finding closest rate MIME-Version: 1.0 Message-Id: <20230717-pll-mipi_set_rate_parent-v4-8-04acf1d39765@oltmanns.dev> References: <20230717-pll-mipi_set_rate_parent-v4-0-04acf1d39765@oltmanns.dev> In-Reply-To: <20230717-pll-mipi_set_rate_parent-v4-0-04acf1d39765@oltmanns.dev> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+lwn-linux-arm-kernel=archive.lwn.net@lists.infradead.org List-Archive: To: Maxime Ripard , Michael Turquette , Stephen Boyd , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Andre Przywara , Roman Beranek Cc: linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, Frank Oltmanns When finding the best rate for a NKM clock, consider rates that are higher than the requested rate, if the CCU_FEATURE_CLOSEST_RATE flag is set by using the helper function ccu_is_better_rate(). Accommodate ccu_mux_helper_determine_rate to this change. Signed-off-by: Frank Oltmanns Acked-by: Maxime Ripard --- drivers/clk/sunxi-ng/ccu_mux.c | 2 +- drivers/clk/sunxi-ng/ccu_nkm.c | 18 ++++++++---------- 2 files changed, 9 insertions(+), 11 deletions(-) diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c index 1d557e323169..3ca695439620 100644 --- a/drivers/clk/sunxi-ng/ccu_mux.c +++ b/drivers/clk/sunxi-ng/ccu_mux.c @@ -139,7 +139,7 @@ int ccu_mux_helper_determine_rate(struct ccu_common *common, goto out; } - if ((req->rate - tmp_rate) < (req->rate - best_rate)) { + if (ccu_is_better_rate(common, req->rate, tmp_rate, best_rate)) { best_rate = tmp_rate; best_parent_rate = parent_rate; best_parent = parent; diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c index 793160bc2d47..5439b9351cd7 100644 --- a/drivers/clk/sunxi-ng/ccu_nkm.c +++ b/drivers/clk/sunxi-ng/ccu_nkm.c @@ -39,6 +39,7 @@ static unsigned long ccu_nkm_optimal_parent_rate(unsigned long rate, unsigned lo } static unsigned long ccu_nkm_find_best_with_parent_adj(struct clk_hw *phw, struct _ccu_nkm *nkm, + struct ccu_common *common, unsigned long *parent, unsigned long rate) { unsigned long best_rate = 0, best_parent_rate = *parent, tmp_parent = *parent; @@ -54,10 +55,8 @@ static unsigned long ccu_nkm_find_best_with_parent_adj(struct clk_hw *phw, struc tmp_parent = clk_hw_round_rate(phw, tmp_parent); tmp_rate = tmp_parent * _n * _k / _m; - if (tmp_rate > rate) - continue; - if ((rate - tmp_rate) < (rate - best_rate)) { + if (ccu_is_better_rate(common, rate, tmp_rate, best_rate)) { best_rate = tmp_rate; best_parent_rate = tmp_parent; best_n = _n; @@ -78,7 +77,7 @@ static unsigned long ccu_nkm_find_best_with_parent_adj(struct clk_hw *phw, struc } static unsigned long ccu_nkm_find_best(unsigned long parent, unsigned long rate, - struct _ccu_nkm *nkm) + struct _ccu_nkm *nkm, struct ccu_common *common) { unsigned long best_rate = 0; unsigned long best_n = 0, best_k = 0, best_m = 0; @@ -91,9 +90,7 @@ static unsigned long ccu_nkm_find_best(unsigned long parent, unsigned long rate, tmp_rate = parent * _n * _k / _m; - if (tmp_rate > rate) - continue; - if ((rate - tmp_rate) < (rate - best_rate)) { + if (ccu_is_better_rate(common, rate, tmp_rate, best_rate)) { best_rate = tmp_rate; best_n = _n; best_k = _k; @@ -186,9 +183,10 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux, rate *= nkm->fixed_post_div; if (!clk_hw_can_set_rate_parent(&nkm->common.hw)) - rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm); + rate = ccu_nkm_find_best(*parent_rate, rate, &_nkm, &nkm->common); else - rate = ccu_nkm_find_best_with_parent_adj(parent_hw, &_nkm, parent_rate, rate); + rate = ccu_nkm_find_best_with_parent_adj(parent_hw, &_nkm, &nkm->common, + parent_rate, rate); if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate /= nkm->fixed_post_div; @@ -223,7 +221,7 @@ static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate, _nkm.min_m = 1; _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width; - ccu_nkm_find_best(parent_rate, rate, &_nkm); + ccu_nkm_find_best(parent_rate, rate, &_nkm, &nkm->common); spin_lock_irqsave(nkm->common.lock, flags);