linux-kernel - [PATCH 08/18] cx23885: Altera FPGA CI interface reworked.

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Date:	Sun, 22 Aug 2010 14:32:21 +0300
From:	Abylay Ospan <liplianin@...by>
To:	<mchehab@...radead.org>, linux-media@...r.kernel.org,
	<linux-kernel@...r.kernel.org>, <aospan@...up.ru>
Subject: [PATCH 08/18] cx23885: Altera FPGA CI interface reworked.

It decreases I2C traffic.

Signed-off-by: Abylay Ospan <aospan@...up.ru>
Signed-off-by: Igor M. Liplianin <liplianin@...up.ru>
---
 drivers/media/video/cx23885/cx23885-dvb.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/media/video/cx23885/cx23885-dvb.c b/drivers/media/video/cx23885/cx23885-dvb.c
index 6c144f7..53c2b6d 100644
--- a/drivers/media/video/cx23885/cx23885-dvb.c
+++ b/drivers/media/video/cx23885/cx23885-dvb.c
@@ -620,29 +620,29 @@ int netup_altera_fpga_rw(void *device, int flag, int data, int read)
 {
 	struct cx23885_dev *dev = (struct cx23885_dev *)device;
 	unsigned long timeout = jiffies + msecs_to_jiffies(1);
-	int mem = 0;
+	uint32_t mem = 0;
 
-	cx_set(MC417_RWD, ALT_RD | ALT_WR | ALT_CS);
+	mem = cx_read(MC417_RWD);
 	if (read)
 		cx_set(MC417_OEN, ALT_DATA);
 	else {
 		cx_clear(MC417_OEN, ALT_DATA);/* D0-D7 out */
-		mem = cx_read(MC417_RWD);
 		mem &= ~ALT_DATA;
 		mem |= (data & ALT_DATA);
-		cx_write(MC417_RWD, mem);
 	}
 
 	if (flag)
-		cx_set(MC417_RWD, ALT_AD_RG);/* ADDR */
+		mem |= ALT_AD_RG;
 	else
-		cx_clear(MC417_RWD, ALT_AD_RG);/* VAL */
+		mem &= ~ALT_AD_RG;
 
-	cx_clear(MC417_RWD, ALT_CS);/* ~CS */
+	mem &= ~ALT_CS;
 	if (read)
-		cx_clear(MC417_RWD, ALT_RD);
+		mem = (mem & ~ALT_RD) | ALT_WR;
 	else
-		cx_clear(MC417_RWD, ALT_WR);
+		mem = (mem & ~ALT_WR) | ALT_RD;
+
+	cx_write(MC417_RWD, mem);  /* start RW cycle */
 
 	for (;;) {
 		mem = cx_read(MC417_RWD);
-- 
1.7.1

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