ENGR00161948 mxc v4l2 output: fix case of input crop with xoffset

run test like:
/unit_tests//mxc_v4l2_output.out -iw 1280 -ih 720 -cr 1024 700 40 0 -ow 1024
-oh 700 /unit_tests/720p.yuv
Under IPU IC bypass mode, the output color is not correct.
And sometimes come out tearing issue.

Fix them by modify fb driver adding xpanstep support and set vb->state to DONE
after it finish show.

When previous videobuf finish show and next videobuf ready to show, set
VIDEOBUF_DONE state to avoid tearing issue, which make sure showing buffer will
not be dequeue to write new data. It also bring side-effect that the last buffer
can not be dequeue correctly, app need take care about it.

Signed-off-by: Jason Chen <b02280@freescale.com>

1 files changed, 10 insertions, 11 deletions

diff --git a/drivers/video/mxc/mxc_ipuv3_fb.c b/drivers/video/mxc/mxc_ipuv3_fb.c
index 74e4077600b7..e7ad13727de5 100644
--- a/drivers/video/mxc/mxc_ipuv3_fb.c
+++ b/drivers/video/mxc/mxc_ipuv3_fb.c
@@ -170,7 +170,7 @@ static int mxcfb_set_fix(struct fb_info *info)
 	fix->type = FB_TYPE_PACKED_PIXELS;
 	fix->accel = FB_ACCEL_NONE;
 	fix->visual = FB_VISUAL_TRUECOLOR;
-	fix->xpanstep = 0;
+	fix->xpanstep = 1;
 	fix->ywrapstep = 1;
 	fix->ypanstep = 1;
 
@@ -1234,16 +1234,15 @@ mxcfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 		}
 
 		/* update u/v offset */
-		if (info->var.xres_virtual > info->var.xres)
-			ipu_update_channel_offset(mxc_fbi->ipu, mxc_fbi->ipu_ch,
-					IPU_INPUT_BUFFER,
-					bpp_to_pixfmt(info),
-					info->var.xres_virtual,
-					info->var.yres_virtual,
-					info->var.xres_virtual,
-					0, 0,
-					var->yoffset,
-					var->xoffset);
+		ipu_update_channel_offset(mxc_fbi->ipu, mxc_fbi->ipu_ch,
+				IPU_INPUT_BUFFER,
+				bpp_to_pixfmt(info),
+				info->var.xres_virtual,
+				info->var.yres_virtual,
+				info->var.xres_virtual,
+				0, 0,
+				var->yoffset,
+				var->xoffset);
 
 		ipu_select_buffer(mxc_fbi->ipu, mxc_fbi->ipu_ch, IPU_INPUT_BUFFER,
 				  mxc_fbi->cur_ipu_buf);