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authorDevin Heitmueller <dheitmueller@kernellabs.com>2012-08-06 21:47:04 -0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-08-09 19:39:36 -0400
commitfaaf01b2f6be0378c0c6084f0257b150dc014152 (patch)
tree1efc492512b5e405737df9a4917641a3fefc514b /drivers/media/video
parenta595c1ce4c9d572cf53513570b9f1a263d7867f2 (diff)
[media] au0828: speed up i2c clock when doing xc5000 firmware load
Put a hack in place to speed up the firmware load in the case that the xc5000 has just been reset. The chip can safely do 400 KHz in this mode, while in normal operation it can only do 100 KHz. This reduces the firmware load time from 6.9 seconds to 4.2. Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video')
-rw-r--r--drivers/media/video/au0828/au0828-i2c.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/media/video/au0828/au0828-i2c.c b/drivers/media/video/au0828/au0828-i2c.c
index 05c299fa5d79..d4545550e0dd 100644
--- a/drivers/media/video/au0828/au0828-i2c.c
+++ b/drivers/media/video/au0828/au0828-i2c.c
@@ -26,7 +26,7 @@
26#include <linux/io.h> 26#include <linux/io.h>
27 27
28#include "au0828.h" 28#include "au0828.h"
29 29#include "media/tuner.h"
30#include <media/v4l2-common.h> 30#include <media/v4l2-common.h>
31 31
32static int i2c_scan; 32static int i2c_scan;
@@ -147,8 +147,18 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
147 au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); 147 au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
148 148
149 /* Set the I2C clock */ 149 /* Set the I2C clock */
150 au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, 150 if ((dev->board.tuner_type == TUNER_XC5000) &&
151 dev->board.i2c_clk_divider); 151 (dev->board.tuner_addr == msg->addr) &&
152 (msg->len == 64)) {
153 /* Hack to speed up firmware load. The xc5000 lets us do up
154 to 400 KHz when in firmware download mode */
155 au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
156 AU0828_I2C_CLK_250KHZ);
157 } else {
158 /* Use the i2c clock speed in the board configuration */
159 au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
160 dev->board.i2c_clk_divider);
161 }
152 162
153 /* Hardware needs 8 bit addresses */ 163 /* Hardware needs 8 bit addresses */
154 au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); 164 au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);