linux-kernel - [PATCH 6/9] drm/stm/dw_mipi_dsi-stm: convert from round_rate() to determine

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Message-Id: <20250710-drm-clk-round-rate-v1-6-601b9ea384c3@redhat.com>
Date: Thu, 10 Jul 2025 13:43:07 -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 6/9] drm/stm/dw_mipi_dsi-stm: 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/stm/dw_mipi_dsi-stm.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
index 2c7bc064bc66c6a58903a207cbe8091a14231c2b..58eae6804cc82d174323744206be7046568b905c 100644
--- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
+++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
@@ -274,8 +274,8 @@ static unsigned long dw_mipi_dsi_clk_recalc_rate(struct clk_hw *hw,
 	return (unsigned long)pll_out_khz * 1000;
 }
 
-static long dw_mipi_dsi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
-				       unsigned long *parent_rate)
+static int dw_mipi_dsi_clk_determine_rate(struct clk_hw *hw,
+					  struct clk_rate_request *req)
 {
 	struct dw_mipi_dsi_stm *dsi = clk_to_dw_mipi_dsi_stm(hw);
 	unsigned int idf, ndiv, odf, pll_in_khz, pll_out_khz;
@@ -283,14 +283,14 @@ static long dw_mipi_dsi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	DRM_DEBUG_DRIVER("\n");
 
-	pll_in_khz = (unsigned int)(*parent_rate / 1000);
+	pll_in_khz = (unsigned int)(req->best_parent_rate / 1000);
 
 	/* Compute best pll parameters */
 	idf = 0;
 	ndiv = 0;
 	odf = 0;
 
-	ret = dsi_pll_get_params(dsi, pll_in_khz, rate / 1000,
+	ret = dsi_pll_get_params(dsi, pll_in_khz, req->rate / 1000,
 				 &idf, &ndiv, &odf);
 	if (ret)
 		DRM_WARN("Warning dsi_pll_get_params(): bad params\n");
@@ -298,7 +298,9 @@ static long dw_mipi_dsi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 	/* Get the adjusted pll out value */
 	pll_out_khz = dsi_pll_get_clkout_khz(pll_in_khz, idf, ndiv, odf);
 
-	return pll_out_khz * 1000;
+	req->rate = pll_out_khz * 1000;
+
+	return 0;
 }
 
 static int dw_mipi_dsi_clk_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -351,7 +353,7 @@ static const struct clk_ops dw_mipi_dsi_stm_clk_ops = {
 	.disable = dw_mipi_dsi_clk_disable,
 	.is_enabled = dw_mipi_dsi_clk_is_enabled,
 	.recalc_rate = dw_mipi_dsi_clk_recalc_rate,
-	.round_rate = dw_mipi_dsi_clk_round_rate,
+	.determine_rate = dw_mipi_dsi_clk_determine_rate,
 	.set_rate = dw_mipi_dsi_clk_set_rate,
 };
 

-- 
2.50.0