[media] pwc: Avoid sending mode info to the camera when it is not needed

Since we always do a set_video_mode on stream start, there is no need
to actually send the mode info to the device on a s_fmt / s_parm ioctl.
Not doing this saves us doing (slow) usb io.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 22 insertions, 19 deletions

diff --git a/drivers/media/video/pwc/pwc-ctrl.c b/drivers/media/video/pwc/pwc-ctrl.c
index 51ab4c570d0b..9c1fb3f07dee 100644
--- a/drivers/media/video/pwc/pwc-ctrl.c
+++ b/drivers/media/video/pwc/pwc-ctrl.c
@@ -169,10 +169,10 @@ int send_control_msg(struct pwc_device *pdev,
 }
 
 static int set_video_mode_Nala(struct pwc_device *pdev, int size, int pixfmt,
-                               int frames, int *compression)
+                               int frames, int *compression, int send_to_cam)
 {
         unsigned char buf[3];
-        int ret, fps;
+        int fps, ret = 0;
         struct Nala_table_entry *pEntry;
         int frames2frames[31] =
         { /* closest match of framerate */
@@ -207,7 +207,8 @@ static int set_video_mode_Nala(struct pwc_device *pdev, int size, int pixfmt,
                 return -EINVAL;
 
         memcpy(buf, pEntry->mode, 3);
-        ret = send_video_command(pdev, pdev->vendpoint, buf, 3);
+        if (send_to_cam)
+                ret = send_video_command(pdev, pdev->vendpoint, buf, 3);
         if (ret < 0) {
                 PWC_DEBUG_MODULE("Failed to send video command... %d\n", ret);
                 return ret;
@@ -246,11 +247,11 @@ static int set_video_mode_Nala(struct pwc_device *pdev, int size, int pixfmt,
 
 
 static int set_video_mode_Timon(struct pwc_device *pdev, int size, int pixfmt,
-                                int frames, int *compression)
+                                int frames, int *compression, int send_to_cam)
 {
         unsigned char buf[13];
         const struct Timon_table_entry *pChoose;
-        int ret, fps;
+        int fps, ret = 0;
 
         if (size >= PSZ_MAX || *compression < 0 || *compression > 3)
                 return -EINVAL;
@@ -274,7 +275,8 @@ static int set_video_mode_Timon(struct pwc_device *pdev, int size, int pixfmt,
                 return -ENOENT; /* Not supported. */
 
         memcpy(buf, pChoose->mode, 13);
-        ret = send_video_command(pdev, pdev->vendpoint, buf, 13);
+        if (send_to_cam)
+                ret = send_video_command(pdev, pdev->vendpoint, buf, 13);
         if (ret < 0)
                 return ret;
 
@@ -300,10 +302,10 @@ static int set_video_mode_Timon(struct pwc_device *pdev, int size, int pixfmt,
 
 
 static int set_video_mode_Kiara(struct pwc_device *pdev, int size, int pixfmt,
-                                int frames, int *compression)
+                                int frames, int *compression, int send_to_cam)
 {
         const struct Kiara_table_entry *pChoose = NULL;
-        int fps, ret;
+        int fps, ret = 0;
         unsigned char buf[12];
 
         if (size >= PSZ_MAX || *compression < 0 || *compression > 3)
@@ -332,7 +334,8 @@ static int set_video_mode_Kiara(struct pwc_device *pdev, int size, int pixfmt,
         memcpy(buf, pChoose->mode, 12);
 
         /* Firmware bug: video endpoint is 5, but commands are sent to endpoint 4 */
-        ret = send_video_command(pdev, 4 /* pdev->vendpoint */, buf, 12);
+        if (send_to_cam)
+                ret = send_video_command(pdev, 4, buf, 12);
         if (ret < 0)
                 return ret;
 
@@ -358,7 +361,7 @@ static int set_video_mode_Kiara(struct pwc_device *pdev, int size, int pixfmt,
 }
 
 int pwc_set_video_mode(struct pwc_device *pdev, int width, int height,
-        int pixfmt, int frames, int *compression)
+        int pixfmt, int frames, int *compression, int send_to_cam)
 {
         int ret, size;
 
@@ -369,13 +372,13 @@ int pwc_set_video_mode(struct pwc_device *pdev, int width, int height,
 
         if (DEVICE_USE_CODEC1(pdev->type)) {
                 ret = set_video_mode_Nala(pdev, size, pixfmt, frames,
-                                          compression);
+                                          compression, send_to_cam);
         } else if (DEVICE_USE_CODEC3(pdev->type)) {
                 ret = set_video_mode_Kiara(pdev, size, pixfmt, frames,
-                                           compression);
+                                           compression, send_to_cam);
         } else {
                 ret = set_video_mode_Timon(pdev, size, pixfmt, frames,
-                                           compression);
+                                           compression, send_to_cam);
         }
         if (ret < 0) {
                 PWC_ERROR("Failed to set video mode %s@%d fps; return code = %d\n", size2name[size], frames, ret);
diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c
index 1f3386da05fa..23eaceea4862 100644
--- a/drivers/media/video/pwc/pwc-if.c
+++ b/drivers/media/video/pwc/pwc-if.c
@@ -385,8 +385,8 @@ static int pwc_isoc_init(struct pwc_device *pdev)
 retry:
         /* We first try with low compression and then retry with a higher
            compression setting if there is not enough bandwidth. */
-        ret = pwc_set_video_mode(pdev, pdev->width, pdev->height,
-                                 pdev->pixfmt, pdev->vframes, &compression);
+        ret = pwc_set_video_mode(pdev, pdev->width, pdev->height, pdev->pixfmt,
+                                 pdev->vframes, &compression, 1);
 
         /* Get the current alternate interface, adjust packet size */
         intf = usb_ifnum_to_if(udev, 0);
@@ -1129,7 +1129,7 @@ static int usb_pwc_probe(struct usb_interface *intf, const struct usb_device_id
 
         /* Setup intial videomode */
         rc = pwc_set_video_mode(pdev, MAX_WIDTH, MAX_HEIGHT,
-                                V4L2_PIX_FMT_YUV420, 30, &compression);
+                                V4L2_PIX_FMT_YUV420, 30, &compression, 1);
         if (rc)
                 goto err_free_mem;
 
diff --git a/drivers/media/video/pwc/pwc-v4l.c b/drivers/media/video/pwc/pwc-v4l.c
index b275fad2927b..46feece38852 100644
--- a/drivers/media/video/pwc/pwc-v4l.c
+++ b/drivers/media/video/pwc/pwc-v4l.c
@@ -493,7 +493,7 @@ static int pwc_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
                         (pixelformat>>24)&255);
 
         ret = pwc_set_video_mode(pdev, f->fmt.pix.width, f->fmt.pix.height,
-                                 pixelformat, 30, &compression);
+                                 pixelformat, 30, &compression, 0);
 
         PWC_DEBUG_IOCTL("pwc_set_video_mode(), return=%d\n", ret);
 
@@ -1137,7 +1137,7 @@ static int pwc_s_parm(struct file *file, void *fh,
         }
 
         ret = pwc_set_video_mode(pdev, pdev->width, pdev->height, pdev->pixfmt,
-                                 fps, &compression);
+                                 fps, &compression, 0);
 
         pwc_g_parm(file, fh, parm);
 
diff --git a/drivers/media/video/pwc/pwc.h b/drivers/media/video/pwc/pwc.h
index 29b6d3dca83b..f441999e5bd1 100644
--- a/drivers/media/video/pwc/pwc.h
+++ b/drivers/media/video/pwc/pwc.h
@@ -369,7 +369,7 @@ void pwc_construct(struct pwc_device *pdev);
 /** Functions in pwc-ctrl.c */
 /* Request a certain video mode. Returns < 0 if not possible */
 extern int pwc_set_video_mode(struct pwc_device *pdev, int width, int height,
-                              int pixfmt, int frames, int *compression);
+        int pixfmt, int frames, int *compression, int send_to_cam);
 extern unsigned int pwc_get_fps(struct pwc_device *pdev, unsigned int index, unsigned int size);
 extern int pwc_set_leds(struct pwc_device *pdev, int on_value, int off_value);
 extern int pwc_get_cmos_sensor(struct pwc_device *pdev, int *sensor);