linux-kernel - [PATCH RFC v1 2/3] clk: meson: regmap: switch to determine

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Message-Id: <20210517203724.1006254-3-martin.blumenstingl@googlemail.com>
Date:   Mon, 17 May 2021 22:37:23 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     mturquette@...libre.com, sboyd@...nel.org, narmstrong@...libre.com,
        jbrunet@...libre.com, linux-clk@...r.kernel.org
Cc:     khilman@...libre.com, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH RFC v1 2/3] clk: meson: regmap: switch to determine_rate for the dividers

This increases the maxmium supported frequency on 32-bit systems from
2^31 (signed long as used by clk_ops.round_rate, maximum value:
approx. 2.14GHz) to 2^32 (unsigned long as used by
clk_ops.determine_rate, maximum value: approx. 4.29GHz).
On Meson8/8b/8m2 the HDMI PLL and it's OD (post-dividers) are
capable of running at up to 2.97GHz. So switch the divider
implementation in clk-regmap to clk_ops.determine_rate to support these
higher frequencies on 32-bit systems.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/clk/meson/clk-regmap.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/clk/meson/clk-regmap.c b/drivers/clk/meson/clk-regmap.c
index dcd1757cc5df..8ad8977cf1c2 100644
--- a/drivers/clk/meson/clk-regmap.c
+++ b/drivers/clk/meson/clk-regmap.c
@@ -75,8 +75,8 @@ static unsigned long clk_regmap_div_recalc_rate(struct clk_hw *hw,
 				   div->width);
 }
 
-static long clk_regmap_div_round_rate(struct clk_hw *hw, unsigned long rate,
-				      unsigned long *prate)
+static int clk_regmap_div_determine_rate(struct clk_hw *hw,
+					 struct clk_rate_request *req)
 {
 	struct clk_regmap *clk = to_clk_regmap(hw);
 	struct clk_regmap_div_data *div = clk_get_regmap_div_data(clk);
@@ -87,18 +87,17 @@ static long clk_regmap_div_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (div->flags & CLK_DIVIDER_READ_ONLY) {
 		ret = regmap_read(clk->map, div->offset, &val);
 		if (ret)
-			/* Gives a hint that something is wrong */
-			return 0;
+			return ret;
 
 		val >>= div->shift;
 		val &= clk_div_mask(div->width);
 
-		return divider_ro_round_rate(hw, rate, prate, div->table,
-					     div->width, div->flags, val);
+		return divider_ro_determine_rate(hw, req, div->table,
+						 div->width, div->flags, val);
 	}
 
-	return divider_round_rate(hw, rate, prate, div->table, div->width,
-				  div->flags);
+	return divider_determine_rate(hw, req, div->table, div->width,
+				      div->flags);
 }
 
 static int clk_regmap_div_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -123,14 +122,14 @@ static int clk_regmap_div_set_rate(struct clk_hw *hw, unsigned long rate,
 
 const struct clk_ops clk_regmap_divider_ops = {
 	.recalc_rate = clk_regmap_div_recalc_rate,
-	.round_rate = clk_regmap_div_round_rate,
+	.determine_rate = clk_regmap_div_determine_rate,
 	.set_rate = clk_regmap_div_set_rate,
 };
 EXPORT_SYMBOL_GPL(clk_regmap_divider_ops);
 
 const struct clk_ops clk_regmap_divider_ro_ops = {
 	.recalc_rate = clk_regmap_div_recalc_rate,
-	.round_rate = clk_regmap_div_round_rate,
+	.determine_rate = clk_regmap_div_determine_rate,
 };
 EXPORT_SYMBOL_GPL(clk_regmap_divider_ro_ops);
 
-- 
2.31.1