Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media updates from Mauro Carvalho Chehab:
 "The main set of series of patches for media subsystem, including:
   - document RC sysfs class
   - added an API to setup scancode to allow waking up systems using the
     Remote Controller
   - add API for SDR devices.  Drivers are still on staging
   - some API improvements for getting EDID data from media
     inputs/outputs
   - new DVB frontend driver for drx-j (ATSC)
   - one driver (it913x/it9137) got removed, in favor of an improvement
     on another driver (af9035)
   - added a skeleton V4L2 PCI driver at documentation
   - added a dual flash driver (lm3646)
   - added a new IR driver (img-ir)
   - added an IR scancode decoder for the Sharp protocol
   - some improvements at the usbtv driver, to allow its core to be
     reused.
   - added a new SDR driver (rtl2832u_sdr)
   - added a new tuner driver (msi001)
   - several improvements at em28xx driver to fix PM support, device
     removal and to split the V4L2 specific bits into a separate
     sub-driver
   - one driver got converted to videobuf2 (s2255drv)
   - the e4000 tuner driver now follows an improved binding model
   - some fixes at V4L2 compat32 code
   - several fixes and enhancements at videobuf2 code
   - some cleanups at V4L2 API documentation
   - usual driver enhancements, new board additions and misc fixups"

[ NOTE! This merge effective drops commit 4329b93b283c ("of: Reduce
  indentation in of_graph_get_next_endpoint").

  The of_graph_get_next_endpoint() function was moved and renamed by
  commit fd9fdb78a9bf ("[media] of: move graph helpers from
  drivers/media/v4l2-core to drivers/of").  It was originally called
  v4l2_of_get_next_endpoint() and lived in the file
  drivers/media/v4l2-core/v4l2-of.c.

  In that original location, it was then fixed to support empty port
  nodes by commit b9db140c1e46 ("[media] v4l: of: Support empty port
  nodes"), and that commit clashes badly with the dropped "Reduce
  intendation" commit.  I had to choose one or the other, and decided
  that the "Support empty port nodes" commit was more important ]

* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (426 commits)
  [media] em28xx-dvb: fix PCTV 461e tuner I2C binding
  Revert "[media] em28xx-dvb: fix PCTV 461e tuner I2C binding"
  [media] em28xx: fix PCTV 290e LNA oops
  [media] em28xx-dvb: fix PCTV 461e tuner I2C binding
  [media] m88ds3103: fix bug on .set_tone()
  [media] saa7134: fix WARN_ON during resume
  [media] v4l2-dv-timings: add module name, description, license
  [media] videodev2.h: add parenthesis around macro arguments
  [media] saa6752hs: depends on CRC32
  [media] si4713: fix Kconfig dependencies
  [media] Sensoray 2255 uses videobuf2
  [media] adv7180: free an interrupt on failure paths in init_device()
  [media] e4000: make VIDEO_V4L2 dependency optional
  [media] af9033: Don't export functions for the hardware filter
  [media] af9035: use af9033 PID filters
  [media] af9033: implement PID filter
  [media] rtl2832_sdr: do not use dynamic stack allocation
  [media] e4000: fix 32-bit build error
  [media] em28xx-audio: make sure audio is unmuted on open()
  [media] DocBook media: v4l2_format_sdr was renamed to v4l2_sdr_format
  ...

1 files changed, 29 insertions, 12 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
index 7e1724076ac4..ba6433c3a643 100644
--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -81,7 +81,7 @@ static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
 			return len;
 		if (ret == 0x94 + len - 1) {
 			if (i2c_debug == 1)
-				em28xx_warn("R05 returned 0x%02x: I2C timeout",
+				em28xx_warn("R05 returned 0x%02x: I2C ACK error\n",
 					    ret);
 			return -ENXIO;
 		}
@@ -128,7 +128,7 @@ static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
 			break;
 		if (ret == 0x94 + len - 1) {
 			if (i2c_debug == 1)
-				em28xx_warn("R05 returned 0x%02x: I2C timeout",
+				em28xx_warn("R05 returned 0x%02x: I2C ACK error\n",
 					    ret);
 			return -ENXIO;
 		}
@@ -210,7 +210,7 @@ static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 			return len;
 		if (ret == 0x10) {
 			if (i2c_debug == 1)
-				em28xx_warn("I2C transfer timeout on writing to addr 0x%02x",
+				em28xx_warn("I2C ACK error on writing to addr 0x%02x\n",
 					    addr);
 			return -ENXIO;
 		}
@@ -226,10 +226,18 @@ static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 		 * (even with high payload) ...
 		 */
 	}
-	if (i2c_debug)
-		em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
-			    addr, ret);
-	return -ETIMEDOUT;
+
+	if (ret == 0x02 || ret == 0x04) {
+		/* NOTE: these errors seem to be related to clock stretching */
+		if (i2c_debug)
+			em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
+				    addr, ret);
+		return -ETIMEDOUT;
+	}
+
+	em28xx_warn("write to i2c device at 0x%x failed with unknown error (status=%i)\n",
+		    addr, ret);
+	return -EIO;
 }
 
 /*
@@ -274,13 +282,22 @@ static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
 	}
 	if (ret == 0x10) {
 		if (i2c_debug == 1)
-			em28xx_warn("I2C transfer timeout on writing to addr 0x%02x",
+			em28xx_warn("I2C ACK error on writing to addr 0x%02x\n",
 				    addr);
 		return -ENXIO;
 	}
 
-	em28xx_warn("unknown i2c error (status=%i)\n", ret);
-	return -ETIMEDOUT;
+	if (ret == 0x02 || ret == 0x04) {
+		/* NOTE: these errors seem to be related to clock stretching */
+		if (i2c_debug)
+			em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n",
+				    addr, ret);
+		return -ETIMEDOUT;
+	}
+
+	em28xx_warn("write to i2c device at 0x%x failed with unknown error (status=%i)\n",
+		    addr, ret);
+	return -EIO;
 }
 
 /*
@@ -337,7 +354,7 @@ static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 		return len;
 	else if (ret > 0) {
 		if (i2c_debug == 1)
-			em28xx_warn("Bus B R08 returned 0x%02x: I2C timeout",
+			em28xx_warn("Bus B R08 returned 0x%02x: I2C ACK error\n",
 				    ret);
 		return -ENXIO;
 	}
@@ -392,7 +409,7 @@ static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 		return len;
 	else if (ret > 0) {
 		if (i2c_debug == 1)
-			em28xx_warn("Bus B R08 returned 0x%02x: I2C timeout",
+			em28xx_warn("Bus B R08 returned 0x%02x: I2C ACK error\n",
 				    ret);
 		return -ENXIO;
 	}