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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: linux-clk@vger.kernel.org, sboyd@kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH v1 1/6] clk: divider: Implement and wire up .determine_rate by default
Date: Sat,  3 Jul 2021 00:51:40 +0200	[thread overview]
Message-ID: <20210702225145.2643303-2-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20210702225145.2643303-1-martin.blumenstingl@googlemail.com>

.determine_rate is meant to replace .round_rate. The former comes with a
benefit which is especially relevant on 32-bit systems: since
.determine_rate uses an "unsigned long" (compared to a "signed long"
which is used by .round_rate) the maximum value on 32-bit systems
increases from 2^31 (or approx. 2.14GHz) to 2^32 (or approx. 4.29GHz).

Implement .determine_rate in addition to .round_rate so drivers that are
using clk_divider_{ro_,}ops can benefit from this by default. Keep the
.round_rate callback for now since some drivers rely on
clk_divider_ops.round_rate being implemented.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/clk/clk-divider.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 87ba4966b0e8..f6b2bf558486 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -446,6 +446,27 @@ static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 				  divider->width, divider->flags);
 }
 
+static int clk_divider_determine_rate(struct clk_hw *hw,
+				      struct clk_rate_request *req)
+{
+	struct clk_divider *divider = to_clk_divider(hw);
+
+	/* if read only, just return current value */
+	if (divider->flags & CLK_DIVIDER_READ_ONLY) {
+		u32 val;
+
+		val = clk_div_readl(divider) >> divider->shift;
+		val &= clk_div_mask(divider->width);
+
+		return divider_ro_determine_rate(hw, req, divider->table,
+						 divider->width,
+						 divider->flags, val);
+	}
+
+	return divider_determine_rate(hw, req, divider->table, divider->width,
+				      divider->flags);
+}
+
 int divider_get_val(unsigned long rate, unsigned long parent_rate,
 		    const struct clk_div_table *table, u8 width,
 		    unsigned long flags)
@@ -501,6 +522,7 @@ static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
 const struct clk_ops clk_divider_ops = {
 	.recalc_rate = clk_divider_recalc_rate,
 	.round_rate = clk_divider_round_rate,
+	.determine_rate = clk_divider_determine_rate,
 	.set_rate = clk_divider_set_rate,
 };
 EXPORT_SYMBOL_GPL(clk_divider_ops);
@@ -508,6 +530,7 @@ EXPORT_SYMBOL_GPL(clk_divider_ops);
 const struct clk_ops clk_divider_ro_ops = {
 	.recalc_rate = clk_divider_recalc_rate,
 	.round_rate = clk_divider_round_rate,
+	.determine_rate = clk_divider_determine_rate,
 };
 EXPORT_SYMBOL_GPL(clk_divider_ro_ops);
 
-- 
2.32.0


  reply	other threads:[~2021-07-02 22:52 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-02 22:51 [PATCH v1 0/6] clk: switch dividers to .determine_rate Martin Blumenstingl
2021-07-02 22:51 ` Martin Blumenstingl [this message]
2021-08-06  1:10   ` [PATCH v1 1/6] clk: divider: Implement and wire up .determine_rate by default Stephen Boyd
2021-10-14  9:55   ` Alex Bee
2021-10-14 12:11     ` Martin Blumenstingl
2021-10-14 21:34       ` Martin Blumenstingl
2021-10-14 22:52         ` Stephen Boyd
2021-10-15 12:05           ` [PATCH] clk: composite: Also consider .determine_rate for rate + mux composites Martin Blumenstingl
2021-10-15 21:27             ` Stephen Boyd
2021-11-01 20:19             ` Guillaume Tucker
2021-11-01 20:58               ` Martin Blumenstingl
2021-11-01 21:59                 ` Robin Murphy
2021-11-01 22:11                   ` Robin Murphy
2021-11-01 22:41                     ` Alex Bee
2021-11-02  7:58                       ` Guillaume Tucker
2021-11-02 21:40                         ` LABBE Corentin
2021-10-15 19:14         ` [PATCH v1 1/6] clk: divider: Implement and wire up .determine_rate by default Alex Bee
2021-10-15 21:31           ` Stephen Boyd
2021-07-02 22:51 ` [PATCH v1 2/6] clk: imx: clk-divider-gate: Switch to clk_divider.determine_rate Martin Blumenstingl
2021-07-19 10:43   ` Abel Vesa
2021-07-29 11:30   ` Abel Vesa
2021-07-02 22:51 ` [PATCH v1 3/6] clk: bcm2835: " Martin Blumenstingl
2021-07-05  6:57   ` Marek Szyprowski
2021-08-06  1:10   ` Stephen Boyd
2021-07-02 22:51 ` [PATCH v1 4/6] clk: stm32f4: " Martin Blumenstingl
2021-08-06  1:10   ` Stephen Boyd
2021-07-02 22:51 ` [PATCH v1 5/6] clk: stm32h7: " Martin Blumenstingl
2021-08-06  1:10   ` Stephen Boyd
2021-07-02 22:51 ` [PATCH v1 6/6] clk: stm32mp1: " Martin Blumenstingl
2021-08-06  1:10   ` Stephen Boyd
2021-08-03 19:32 ` [PATCH v1 0/6] clk: switch dividers to .determine_rate Martin Blumenstingl
2021-08-03 20:16   ` Stephen Boyd

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