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V4L/DVB (6345): ivtvfb: YUV handling of an image which is not visible in the display area

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When the ivtvfb module is loaded, the YUV output is relative to the
framebuffer output. When a virtual screen size is used, the output area for
the YUV may actually be off screen. To prevent the hardware from crashing,
the current driver will ignore an off-screen position and leave the output
visible at the last on-screen position. This may not be desirable, so this
patch will switch off the YUV output should the image move off-screen, and
re-enable it should the image move on-screen again.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Ian Armstrong 2007-10-14 13:08:02 -03:00 committed by Mauro Carvalho Chehab
parent d343d7f979
commit 0bfeb04a9f
2 changed files with 13 additions and 10 deletions
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22
drivers/media/video/ivtv/ivtv-yuv.c
View File

@ -710,7 +710,7 @@ static u32 ivtv_yuv_window_setup (struct ivtv *itv, struct yuv_frame_info *windo
/* If there's nothing to safe to display, we may as well stop now */
if ((int)window->dst_w <= 2 || (int)window->dst_h <= 2 || (int)window->src_w <= 2 || (int)window->src_h <= 2) {
return 0;
return IVTV_YUV_UPDATE_INVALID;
}
/* Ensure video remains inside OSD area */
@ -791,7 +791,7 @@ static u32 ivtv_yuv_window_setup (struct ivtv *itv, struct yuv_frame_info *windo
/* Check again. If there's nothing to safe to display, stop now */
if ((int)window->dst_w <= 2 || (int)window->dst_h <= 2 || (int)window->src_w <= 2 || (int)window->src_h <= 2) {
return 0;
return IVTV_YUV_UPDATE_INVALID;
}
/* Both x offset & width are linked, so they have to be done together */
@ -840,12 +840,17 @@ void ivtv_yuv_work_handler (struct ivtv *itv)
if (!(yuv_update = ivtv_yuv_window_setup (itv, &window)))
return;
/* Update horizontal settings */
if (yuv_update & IVTV_YUV_UPDATE_HORIZONTAL)
ivtv_yuv_handle_horizontal(itv, &window);
if (yuv_update & IVTV_YUV_UPDATE_INVALID) {
write_reg(0x01008080, 0x2898);
} else if (yuv_update) {
write_reg(0x00108080, 0x2898);
if (yuv_update & IVTV_YUV_UPDATE_VERTICAL)
ivtv_yuv_handle_vertical(itv, &window);
if (yuv_update & IVTV_YUV_UPDATE_HORIZONTAL)
ivtv_yuv_handle_horizontal(itv, &window);
if (yuv_update & IVTV_YUV_UPDATE_VERTICAL)
ivtv_yuv_handle_vertical(itv, &window);
}
memcpy(&itv->yuv_info.old_frame_info, &window, sizeof (itv->yuv_info.old_frame_info));
}
@ -936,9 +941,6 @@ static void ivtv_yuv_init (struct ivtv *itv)
IVTV_DEBUG_WARN ("Failed to allocate yuv blanking buffer\n");
}
IVTV_DEBUG_WARN("Enable video output\n");
write_reg_sync(0x00108080, 0x2898);
/* Enable YUV decoder output */
write_reg_sync(0x01, IVTV_REG_VDM);

1
drivers/media/video/ivtv/ivtv-yuv.h
View File

@ -34,6 +34,7 @@
#define IVTV_YUV_UPDATE_HORIZONTAL 0x01
#define IVTV_YUV_UPDATE_VERTICAL 0x02
#define IVTV_YUV_UPDATE_INVALID 0x04
extern const u32 yuv_offset[4];