V4L/DVB (10119): em28xx: fix corrupted XCLK value

Correct problem introduced during the board refactoring where the XCLK
frequency would get zero'd out.  The sequence of events was as follows:

em28xx_pre_card_setup() called em28xx_set_model()
em28xx_set_model() would memcpy to dev->board configuration
em28xx_pre_card_setup() would set the dev->board.xclk if not set
em28xx_pre_card_setup() would set the XCLK register based on dev->board.xclk
...
em28xx_card_setup() would call em28xx_set_model()
em28xx_set_model() would memcpy to dev->board configuration (clearing out
 value of dev->board.xclk set in em28xx_pre_card_setup)
...
em28xx_audio_analog_set() sets the XCLK register based on dev->board.xclk
 (which now contains zero)

The change sets the default XCLK and I2C Clock fields in the board definition
inside of em28xx_set_model() so that subsequent calls do not cause the
values to be overwritten.

Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 13 insertions, 11 deletions

diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index 11ce63578e9b..c427c0eeba1d 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -1403,6 +1403,17 @@ EXPORT_SYMBOL_GPL(em28xx_tuner_callback);
 static void inline em28xx_set_model(struct em28xx *dev)
 {
         memcpy(&dev->board, &em28xx_boards[dev->model], sizeof(dev->board));
+
+        /* Those are the default values for the majority of boards
+           Use those values if not specified otherwise at boards entry
+         */
+        if (!dev->board.xclk)
+                dev->board.xclk = EM28XX_XCLK_IR_RC5_MODE |
+                                  EM28XX_XCLK_FREQUENCY_12MHZ;
+
+        if (!dev->board.i2c_speed)
+                dev->board.i2c_speed = EM28XX_I2C_CLK_WAIT_ENABLE |
+                                       EM28XX_I2C_FREQ_100_KHZ;
 }
 
 /* Since em28xx_pre_card_setup() requires a proper dev->model,
@@ -1464,17 +1475,8 @@ void em28xx_pre_card_setup(struct em28xx *dev)
         if (rc >= 0)
                 dev->reg_gpo = rc;
 
-        /* Those are the default values for the majority of boards
-           Use those values if not specified otherwise at boards entry
-         */
-        if (!dev->board.xclk)
-                dev->board.xclk = EM28XX_XCLK_IR_RC5_MODE |
-                                  EM28XX_XCLK_FREQUENCY_12MHZ;
-
-        if (!dev->board.i2c_speed)
-                dev->board.i2c_speed = EM28XX_I2C_CLK_WAIT_ENABLE |
-                                       EM28XX_I2C_FREQ_100_KHZ;
-
+        /* Set the initial XCLK and I2C clock values based on the board
+           definition */
         em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk & 0x7f);
         em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, dev->board.i2c_speed);
         msleep(50);