media: cx25840: don't open-code cx25840_reset() inside cx25840_load_fw()

cx25840_load_fw() does the same thing as cx25840_reset(), only keeps
"is_initialized" flag so any further invocation of this function besides
the first one is a NOP.
Let's just call cx25840_reset() directly from cx25840_load_fw() instead of
open coding it there.

While we are at it, let's also improve comments about cx25840_load_fw()
so they are current and in the proper style (one of them even referred to a
non-existing cx25840 init operation).
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/cx25840/cx25840-core.c

@@ -1649,32 +1649,46 @@ static void log_audio_status(struct i2c_client *client)
 
 /* ----------------------------------------------------------------------- */
 
-/* This load_fw operation must be called to load the driver's firmware.
-   Without this the audio standard detection will fail and you will
-   only get mono.
-
-   Since loading the firmware is often problematic when the driver is
-   compiled into the kernel I recommend postponing calling this function
-   until the first open of the video device. Another reason for
-   postponing it is that loading this firmware takes a long time (seconds)
-   due to the slow i2c bus speed. So it will speed up the boot process if
-   you can avoid loading the fw as long as the video device isn't used.  */
-static int cx25840_load_fw(struct v4l2_subdev *sd)
+static int cx25840_reset(struct v4l2_subdev *sd, u32 val)
 {
 	struct cx25840_state *state = to_state(sd);
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 
+	if (is_cx2583x(state))
+		cx25836_initialize(client);
+	else if (is_cx2388x(state))
+		cx23885_initialize(client);
+	else if (is_cx231xx(state))
+		cx231xx_initialize(client);
+	else
+		cx25840_initialize(client);
+
+	state->is_initialized = 1;
+
+	return 0;
+}
+
+/*
+ * This load_fw operation must be called to load the driver's firmware.
+ * This will load the firmware on the first invocation (further ones are NOP).
+ * Without this the audio standard detection will fail and you will
+ * only get mono.
+ * Alternatively, you can call the reset operation instead of this one.
+ *
+ * Since loading the firmware is often problematic when the driver is
+ * compiled into the kernel I recommend postponing calling this function
+ * until the first open of the video device. Another reason for
+ * postponing it is that loading this firmware takes a long time (seconds)
+ * due to the slow i2c bus speed. So it will speed up the boot process if
+ * you can avoid loading the fw as long as the video device isn't used.
+ */
+static int cx25840_load_fw(struct v4l2_subdev *sd)
+{
+	struct cx25840_state *state = to_state(sd);
+
 	if (!state->is_initialized) {
 		/* initialize and load firmware */
-		state->is_initialized = 1;
-		if (is_cx2583x(state))
-			cx25836_initialize(client);
-		else if (is_cx2388x(state))
-			cx23885_initialize(client);
-		else if (is_cx231xx(state))
-			cx231xx_initialize(client);
-		else
-			cx25840_initialize(client);
+		cx25840_reset(sd, 0);
 	}
 	return 0;
 }
@@ -1937,22 +1951,6 @@ static int cx25840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
 	return 0;
 }
 
-static int cx25840_reset(struct v4l2_subdev *sd, u32 val)
-{
-	struct cx25840_state *state = to_state(sd);
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-
-	if (is_cx2583x(state))
-		cx25836_initialize(client);
-	else if (is_cx2388x(state))
-		cx23885_initialize(client);
-	else if (is_cx231xx(state))
-		cx231xx_initialize(client);
-	else
-		cx25840_initialize(client);
-	return 0;
-}
-
 static int cx25840_log_status(struct v4l2_subdev *sd)
 {
 	struct cx25840_state *state = to_state(sd);

include/media/drv-intf/cx25840.h

@@ -9,17 +9,23 @@
 #ifndef _CX25840_H_
 #define _CX25840_H_
 
-/* Note that the cx25840 driver requires that the bridge driver calls the
-   v4l2_subdev's init operation in order to load the driver's firmware.
-   Without this the audio standard detection will fail and you will
-   only get mono.
-
-   Since loading the firmware is often problematic when the driver is
-   compiled into the kernel I recommend postponing calling this function
-   until the first open of the video device. Another reason for
-   postponing it is that loading this firmware takes a long time (seconds)
-   due to the slow i2c bus speed. So it will speed up the boot process if
-   you can avoid loading the fw as long as the video device isn't used. */
+/*
+ * Note that the cx25840 driver requires that the bridge driver calls the
+ * v4l2_subdev's load_fw operation in order to load the driver's firmware.
+ * This will load the firmware on the first invocation (further ones are NOP).
+ * Without this the audio standard detection will fail and you will
+ * only get mono.
+ * Alternatively, you can call the reset operation (this can be done
+ * multiple times if needed, each invocation will fully reinitialize
+ * the device).
+ *
+ * Since loading the firmware is often problematic when the driver is
+ * compiled into the kernel I recommend postponing calling this function
+ * until the first open of the video device. Another reason for
+ * postponing it is that loading this firmware takes a long time (seconds)
+ * due to the slow i2c bus speed. So it will speed up the boot process if
+ * you can avoid loading the fw as long as the video device isn't used.
+ */
 
 enum cx25840_video_input {
 	/* Composite video inputs In1-In8 */