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From: Bich HEMON <bich.hemon@st.com>
To: Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre TORGUE <alexandre.torgue@st.com>,
	Pierre Yves MORDRET <pierre-yves.mordret@st.com>,
	Wolfram Sang <wsa@the-dreams.de>,
	"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-stm32@st-md-mailman.stormreply.com" 
	<linux-stm32@st-md-mailman.stormreply.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Bich HEMON <bich.hemon@st.com>
Subject: [PATCH] i2c: i2c-stm32f7: improve loopback in timing algorithm
Date: Wed, 6 Mar 2019 15:12:32 +0000	[thread overview]
Message-ID: <1551885142-22365-1-git-send-email-bich.hemon@st.com> (raw)

From: Nicolas Le Bayon <nicolas.le.bayon@st.com>

This avoids useless loops inside the I2C timing algorithm.
Actually, we support only one possible solution per prescaler value.
So after finding a solution with a prescaler, the algorithm can
switch directly to the next prescaler value.

Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/i2c/busses/i2c-stm32f7.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 4284fc9..48337be 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -476,8 +476,12 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev,
 
 					list_add_tail(&v->node,
 						      &solutions);
+					break;
 				}
 			}
+
+			if (p_prev == p)
+				break;
 		}
 	}
 
-- 
1.9.1

WARNING: multiple messages have this Message-ID (diff)
From: Bich HEMON <bich.hemon@st.com>
To: Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre TORGUE <alexandre.torgue@st.com>,
	Pierre Yves MORDRET <pierre-yves.mordret@st.com>,
	Wolfram Sang <wsa@the-dreams.de>,
	"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-stm32@st-md-mailman.stormreply.com"
	<linux-stm32@st-md-mailman.stormreply.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Bich HEMON <bich.hemon@st.com>
Subject: [PATCH] i2c: i2c-stm32f7: improve loopback in timing algorithm
Date: Wed, 6 Mar 2019 15:12:32 +0000	[thread overview]
Message-ID: <1551885142-22365-1-git-send-email-bich.hemon@st.com> (raw)

From: Nicolas Le Bayon <nicolas.le.bayon@st.com>

This avoids useless loops inside the I2C timing algorithm.
Actually, we support only one possible solution per prescaler value.
So after finding a solution with a prescaler, the algorithm can
switch directly to the next prescaler value.

Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/i2c/busses/i2c-stm32f7.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 4284fc9..48337be 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -476,8 +476,12 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev,
 
 					list_add_tail(&v->node,
 						      &solutions);
+					break;
 				}
 			}
+
+			if (p_prev == p)
+				break;
 		}
 	}
 
-- 
1.9.1

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             reply	other threads:[~2019-03-06 15:12 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-06 15:12 Bich HEMON [this message]
2019-03-06 15:12 ` [PATCH] i2c: i2c-stm32f7: improve loopback in timing algorithm Bich HEMON
2019-03-06 15:12 ` Bich HEMON
2019-03-07 10:22 ` Pierre Yves MORDRET
2019-03-07 10:22   ` Pierre Yves MORDRET
2019-03-07 10:22   ` Pierre Yves MORDRET
2019-03-20 17:00 ` Wolfram Sang
2019-03-20 17:00   ` Wolfram Sang
2019-03-20 17:00   ` Wolfram Sang

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