[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>

diff --git a/drivers/media/video/au0828/au0828-i2c.c b/drivers/media/video/au0828/au0828-i2c.c
index 05c299fa5d79f5c90de3da3eca758ad45f7f2933..d4545550e0dde25a196e4c533e1f20d9c80ae485 100644 (file)
--- a/drivers/media/video/au0828/au0828-i2c.c
+++ b/drivers/media/video/au0828/au0828-i2c.c
@@ -26,7 +26,7 @@
 #include <linux/io.h>
 
 #include "au0828.h"
-
+#include "media/tuner.h"
 #include <media/v4l2-common.h>
 
 static int i2c_scan;
@@ -147,8 +147,18 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
        au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
 
        /* Set the I2C clock */
-       au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
-                    dev->board.i2c_clk_divider);
+       if ((dev->board.tuner_type == TUNER_XC5000) &&
+           (dev->board.tuner_addr == msg->addr) &&
+           (msg->len == 64)) {
+               /* Hack to speed up firmware load.  The xc5000 lets us do up
+                  to 400 KHz when in firmware download mode */
+               au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
+                            AU0828_I2C_CLK_250KHZ);
+       } else {
+               /* Use the i2c clock speed in the board configuration */
+               au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
+                            dev->board.i2c_clk_divider);
+       }
 
        /* Hardware needs 8 bit addresses */
        au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);