linux-kernel - [PATCH 9/9] drm/sun4i/sun4i_tcon_dclk: convert from round_rate() to determine

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Message-Id: <20250710-drm-clk-round-rate-v1-9-601b9ea384c3@redhat.com>
Date: Thu, 10 Jul 2025 13:43:10 -0400
From: Brian Masney <bmasney@...hat.com>
To: Philipp Zabel <p.zabel@...gutronix.de>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Rob Clark <robin.clark@....qualcomm.com>, 
 Dmitry Baryshkov <lumag@...nel.org>, 
 Abhinav Kumar <abhinav.kumar@...ux.dev>, 
 Jessica Zhang <jessica.zhang@....qualcomm.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 Yannick Fertre <yannick.fertre@...s.st.com>, 
 Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>, 
 Philippe Cornu <philippe.cornu@...s.st.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, Stephen Boyd <sboyd@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, imx@...ts.linux.dev, 
 linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 freedreno@...ts.freedesktop.org, linux-stm32@...md-mailman.stormreply.com, 
 linux-sunxi@...ts.linux.dev, Brian Masney <bmasney@...hat.com>
Subject: [PATCH 9/9] drm/sun4i/sun4i_tcon_dclk: convert from round_rate()
 to determine_rate()

The round_rate() clk ops is deprecated, so migrate this driver from
round_rate() to determine_rate() using the Coccinelle semantic patch
on the cover letter of this series.

Signed-off-by: Brian Masney <bmasney@...hat.com>
---
 drivers/gpu/drm/sun4i/sun4i_tcon_dclk.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon_dclk.c b/drivers/gpu/drm/sun4i/sun4i_tcon_dclk.c
index 03d7de1911cd654f395ea85ad914588c4351f391..9b85bf512d4c81d0a12e8cf726d5d5440343519c 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon_dclk.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon_dclk.c
@@ -67,8 +67,8 @@ static unsigned long sun4i_dclk_recalc_rate(struct clk_hw *hw,
 	return parent_rate / val;
 }
 
-static long sun4i_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
-				  unsigned long *parent_rate)
+static int sun4i_dclk_determine_rate(struct clk_hw *hw,
+				     struct clk_rate_request *req)
 {
 	struct sun4i_dclk *dclk = hw_to_dclk(hw);
 	struct sun4i_tcon *tcon = dclk->tcon;
@@ -77,7 +77,7 @@ static long sun4i_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
 	int i;
 
 	for (i = tcon->dclk_min_div; i <= tcon->dclk_max_div; i++) {
-		u64 ideal = (u64)rate * i;
+		u64 ideal = (u64) req->rate * i;
 		unsigned long rounded;
 
 		/*
@@ -99,17 +99,19 @@ static long sun4i_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
 			goto out;
 		}
 
-		if (abs(rate - rounded / i) <
-		    abs(rate - best_parent / best_div)) {
+		if (abs(req->rate - rounded / i) <
+		    abs(req->rate - best_parent / best_div)) {
 			best_parent = rounded;
 			best_div = i;
 		}
 	}
 
 out:
-	*parent_rate = best_parent;
+	req->best_parent_rate = best_parent;
 
-	return best_parent / best_div;
+	req->rate = best_parent / best_div;
+
+	return 0;
 }
 
 static int sun4i_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -155,7 +157,7 @@ static const struct clk_ops sun4i_dclk_ops = {
 	.is_enabled	= sun4i_dclk_is_enabled,
 
 	.recalc_rate	= sun4i_dclk_recalc_rate,
-	.round_rate	= sun4i_dclk_round_rate,
+	.determine_rate = sun4i_dclk_determine_rate,
 	.set_rate	= sun4i_dclk_set_rate,
 
 	.get_phase	= sun4i_dclk_get_phase,

-- 
2.50.0