media: staging/ipu7: avoid division by 64-bit value

media: staging/ipu7: avoid division by 64-bit value

On 32-bit targets, this causes a link failure:

x86_64-linux-ld: drivers/staging/media/ipu7/ipu7-isys-csi-phy.o: in function `ipu7_isys_phy_config':
ipu7-isys-csi-phy.c:(.text+0x1509): undefined reference to `__udivdi3'

Note that this does not divide a 64-bit number by a 32-bit one as usual,
but the other way round, which is something that the compiler should
really be able to figure out but does not (as of gcc-15).

A few lines higher, a similar division is done using the incorrect div_u64()
that truncates the 64-bit divisor to 32 bits.

Change both to use the safe but slow div64_u64() helper.

Fixes: a516d36bdc3d ("media: staging/ipu7: add IPU7 input system device driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>