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V4L/DVB (5441): Saa7146: Fix allocation of clipping memory

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Olaf Hering pointed out that SAA7146_CLIPPING_MEM would become
very large for PAGE_SIZE > 4K.
In fact, the number of clipping windows is limited to 16,
and calculate_clipping_registers_rect() does not use more
than 256 bytes. SAA7146_CLIPPING_MEM adjusted accordingly.

Thanks-to: Olaf Hering <olaf@aepfle.de>
Acked-by: Michael Hunold <hunold@linuxtv.org>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Oliver Endriss 2007-03-13 23:44:57 -03:00 committed by Mauro Carvalho Chehab
parent 21b48a70f7
commit 7a7cd19209
1 changed files with 2 additions and 1 deletions
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include/media/saa7146_vv.h
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@ -239,7 +239,8 @@ void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits);
#define SAA7146_HPS_SYNC_PORT_B 0x01
/* some memory sizes */
#define SAA7146_CLIPPING_MEM (14*PAGE_SIZE)
/* max. 16 clipping rectangles */
#define SAA7146_CLIPPING_MEM (16 * 4 * sizeof(u32))
/* some defines for the various clipping-modes */
#define SAA7146_CLIPPING_RECT 0x4