linux-kernel - [RFC 2.6.28 3/3] mach-pxa: use batch set/get in am300epd

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Date:	Sun, 25 Jan 2009 17:54:49 +0800
From:	Jaya Kumar <jayakumar.lkml@...il.com>
To:	jayakumar.lkml@...il.com
Cc:	David Brownell <david-b@...bell.net>,
	Eric Miao <eric.miao@...vell.com>,
	Paulius Zaleckas <paulius.zaleckas@...tonika.lt>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Sam Ravnborg <sam@...nborg.org>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	Jaya Kumar <jayakumar.lkml@...il.com>
Subject: [RFC 2.6.28 3/3] mach-pxa: use batch set/get in am300epd

This patch to am300epd uses the batch gpiolib set/get API in order
to significantly improve performance when transferring framebuffer
data.

Cc: David Brownell <david-b@...bell.net>
Cc: Eric Miao <eric.miao@...vell.com>
Cc: Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: linux-arm-kernel@...ts.arm.linux.org.uk
Cc: linux-fbdev-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Cc: linux-embedded@...r.kernel.org
Signed-off-by: Jaya Kumar <jayakumar.lkml@...il.com>
---
 arch/arm/mach-pxa/am300epd.c |   23 ++++++++++++-----------
 1 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-pxa/am300epd.c b/arch/arm/mach-pxa/am300epd.c
index 4bd10a1..237e3be 100644
--- a/arch/arm/mach-pxa/am300epd.c
+++ b/arch/arm/mach-pxa/am300epd.c
@@ -187,24 +187,25 @@ static void am300_cleanup(struct broadsheetfb_par *par)
 
 static u16 am300_get_hdb(struct broadsheetfb_par *par)
 {
-	u16 res = 0;
-	int i;
-
-	for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
-		res |= (gpio_get_value(DB0_GPIO_PIN + i)) ? (1 << i) : 0;
+	int err;
+	u32 val;
 
-	return res;
+	err = gpio_get_batch(DB0_GPIO_PIN, 0xFFFF, &val);
+	if (err) {
+		dev_err(&am300_device->dev, "get failed: %d\n", err);
+		return 0;
+	}
+	return (u16) val;
 }
 
 static void am300_set_hdb(struct broadsheetfb_par *par, u16 data)
 {
-	int i;
-
-	for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
-		gpio_set_value(DB0_GPIO_PIN + i, (data >> i) & 0x01);
+	int err;
+	err = gpio_set_batch(DB0_GPIO_PIN, 0xFFFF, data);
+	if (err)
+		dev_err(&am300_device->dev, "set failed: %d\n", err);
 }
 
-
 static void am300_set_ctl(struct broadsheetfb_par *par, unsigned char bit,
 				u8 state)
 {
-- 
1.5.2.3

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