clk: Move no reparent case into a separate function

We'll need to turn the code in clk_mux_determine_rate_flags() to deal
with CLK_SET_RATE_NO_REPARENT into a helper clock drivers will be able
to use if they don't want to allow reparenting.

Cc: Abel Vesa <abelvesa@kernel.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: "Andreas Färber" <afaerber@suse.de>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Charles Keepax <ckeepax@opensource.cirrus.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Chen-Yu Tsai <wenst@chromium.org>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Cc: Claudiu Beznea <claudiu.beznea@microchip.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@gmail.com>
Cc: David Lechner <david@lechnology.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Kishon Vijay Abraham I <kishon@kernel.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Luca Ceresoli <luca.ceresoli@bootlin.com>
Cc: Manivannan Sadhasivam <mani@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Markus Schneider-Pargmann <msp@baylibre.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Mikko Perttunen <mperttunen@nvidia.com>
Cc: Miles Chen <miles.chen@mediatek.com>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Peter De Schrijver <pdeschrijver@nvidia.com>
Cc: Prashant Gaikwad <pgaikwad@nvidia.com>
Cc: Richard Fitzgerald <rf@opensource.cirrus.com>
Cc: Samuel Holland <samuel@sholland.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-actions@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@vger.kernel.org
Cc: linux-phy@lists.infradead.org
Cc: linux-renesas-soc@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Cc: linux-sunxi@lists.linux.dev
Cc: linux-tegra@vger.kernel.org
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: patches@opensource.cirrus.com
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v4-3-971d5077e7d2@cerno.tech

1 files changed, 43 insertions, 32 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index e495dd7a1eae..f57f821a5e5a 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -594,45 +594,58 @@ clk_core_forward_rate_req(struct clk_core *core,
 		req->max_rate = old_req->max_rate;
 }
 
-int clk_mux_determine_rate_flags(struct clk_hw *hw,
-				 struct clk_rate_request *req,
-				 unsigned long flags)
+static int
+clk_core_determine_rate_no_reparent(struct clk_hw *hw,
+				    struct clk_rate_request *req)
 {
-	struct clk_core *core = hw->core, *parent, *best_parent = NULL;
-	int i, num_parents, ret;
-	unsigned long best = 0;
-
-	/* if NO_REPARENT flag set, pass through to current parent */
-	if (core->flags & CLK_SET_RATE_NO_REPARENT) {
-		parent = core->parent;
-		if (core->flags & CLK_SET_RATE_PARENT) {
-			struct clk_rate_request parent_req;
+	struct clk_core *core = hw->core;
+	struct clk_core *parent = core->parent;
+	unsigned long best;
+	int ret;
 
-			if (!parent) {
-				req->rate = 0;
-				return 0;
-			}
+	if (core->flags & CLK_SET_RATE_PARENT) {
+		struct clk_rate_request parent_req;
 
-			clk_core_forward_rate_req(core, req, parent, &parent_req, req->rate);
+		if (!parent) {
+			req->rate = 0;
+			return 0;
+		}
 
-			trace_clk_rate_request_start(&parent_req);
+		clk_core_forward_rate_req(core, req, parent, &parent_req,
+					  req->rate);
 
-			ret = clk_core_round_rate_nolock(parent, &parent_req);
-			if (ret)
-				return ret;
+		trace_clk_rate_request_start(&parent_req);
 
-			trace_clk_rate_request_done(&parent_req);
+		ret = clk_core_round_rate_nolock(parent, &parent_req);
+		if (ret)
+			return ret;
 
-			best = parent_req.rate;
-		} else if (parent) {
-			best = clk_core_get_rate_nolock(parent);
-		} else {
-			best = clk_core_get_rate_nolock(core);
-		}
+		trace_clk_rate_request_done(&parent_req);
 
-		goto out;
+		best = parent_req.rate;
+	} else if (parent) {
+		best = clk_core_get_rate_nolock(parent);
+	} else {
+		best = clk_core_get_rate_nolock(core);
 	}
 
+	req->rate = best;
+
+	return 0;
+}
+
+int clk_mux_determine_rate_flags(struct clk_hw *hw,
+				 struct clk_rate_request *req,
+				 unsigned long flags)
+{
+	struct clk_core *core = hw->core, *parent, *best_parent = NULL;
+	int i, num_parents, ret;
+	unsigned long best = 0;
+
+	/* if NO_REPARENT flag set, pass through to current parent */
+	if (core->flags & CLK_SET_RATE_NO_REPARENT)
+		return clk_core_determine_rate_no_reparent(hw, req);
+
 	/* find the parent that can provide the fastest rate <= rate */
 	num_parents = core->num_parents;
 	for (i = 0; i < num_parents; i++) {
@@ -670,9 +683,7 @@ int clk_mux_determine_rate_flags(struct clk_hw *hw,
 	if (!best_parent)
 		return -EINVAL;
 
-out:
-	if (best_parent)
-		req->best_parent_hw = best_parent->hw;
+	req->best_parent_hw = best_parent->hw;
 	req->best_parent_rate = best;
 	req->rate = best;