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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2019-08-30 15:48:27 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-10-10 12:15:57 +0200 |
| commit | 672c29b91670ab34de288bb7015e9a12c63d007e (patch) | |
| tree | cbe95125b7839584b35c62fa34caaf407ebf989f /drivers/media/i2c/max2175.c | |
| parent | media: media/pci/ivtv: Variable vbi.type could be uninitialized if macro v4l2... (diff) | |
| download | linux-672c29b91670ab34de288bb7015e9a12c63d007e.tar.xz linux-672c29b91670ab34de288bb7015e9a12c63d007e.zip | |
media: i2c: Use div64_ul() for u64-by-unsigned-long divide
div_u64() does a 64-by-32 division, while the divisor max2175.xtal_freq
is unsigned long, thus 64-bit on 64-bit platforms. Hence the proper
function to call is div64_ul().
Note that this change does not have any functional impact, as the
crystal frequency must be much lower than the 32-bit limit anyway.
On 32-bit platforms, the generated code is the same. But at least on
arm64, this saves an AND-instruction to truncate xtal_freq to 32-bit.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/i2c/max2175.c')
| -rw-r--r-- | drivers/media/i2c/max2175.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/media/i2c/max2175.c b/drivers/media/i2c/max2175.c index 19a3ceea3bc2..506a30e69ced 100644 --- a/drivers/media/i2c/max2175.c +++ b/drivers/media/i2c/max2175.c @@ -591,8 +591,8 @@ static int max2175_set_lo_freq(struct max2175 *ctx, u32 lo_freq) lo_freq *= lo_mult; int_desired = lo_freq / ctx->xtal_freq; - frac_desired = div_u64((u64)(lo_freq % ctx->xtal_freq) << 20, - ctx->xtal_freq); + frac_desired = div64_ul((u64)(lo_freq % ctx->xtal_freq) << 20, + ctx->xtal_freq); /* Check CSM is not busy */ ret = max2175_poll_csm_ready(ctx); |