[media] adv7604: fix tx 5v detect regression

The 5 volt detect functionality broke in 3.14: the code reads IO register 0x70
again after it has already been cleared. Instead it should use the cached
irq_reg_0x70 value and the io_write to 0x71 to clear 0x70 can be dropped since
this has already been done.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: <stable@vger.kernel.org>      # for v3.14 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index f8dd7505b529..e1719ffdfb3d 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -1960,10 +1960,9 @@ static int adv76xx_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
         }
 
         /* tx 5v detect */
-        tx_5v = io_read(sd, 0x70) & info->cable_det_mask;
+        tx_5v = irq_reg_0x70 & info->cable_det_mask;
         if (tx_5v) {
                 v4l2_dbg(1, debug, sd, "%s: tx_5v: 0x%x\n", __func__, tx_5v);
-                io_write(sd, 0x71, tx_5v);
                 adv76xx_s_detect_tx_5v_ctrl(sd);
                 if (handled)
                         *handled = true;