[0/2] media: qcom: camss: V4L2_CID_PIXEL_RATE/LINK_FREQ fixes

Message

Andrey Konovalov Feb. 14, 2021, 9:34 p.m. UTC

The first patch is the start of the work discussed in the "[RFC] Repurpose
V4L2_CID_PIXEL_RATE for the sampling rate in the pixel array" thread [1].
I plan to send a few other similar patches for other CSI receiver drivers,
and if the current patchset needs to wait for those before it can be merged,
that's fine for me.

The reason I decided to post the camss patch first is the patch [2] by
Vladimir Lypak. The second patch in this series is the Vladimir's patch
rebased onto the changes done by the first patch. By replacing getting
the pixel clock with v4l2_get_link_freq() my first patch also fixes the
integer overflow which Vladimir's patch addresses. So the second patch
only needs to fix drivers/media/platform/qcom/camss/camss-vfe.c which
the first patch doesn't touch.

The resulting patchset is free from the "undefined reference to `__udivdi3'"
issue [3] as the u64 value is only divided by a power of 2, which doesn't
need do_div().

Vladimir, please confirm if this patchset fixes the integer overflow
for you, and if you are OK with your patch going on top of mine like is
done in this patchset.

[1] https://www.spinics.net/lists/linux-media/msg183183.html
[2] https://www.spinics.net/lists/linux-media/msg186875.html
[3] https://www.spinics.net/lists/linux-media/msg186918.html

Comments

Vladimir Lypak Feb. 16, 2021, 8:56 p.m. UTC | #1

Hello, Andrey!

Thank you for including my patch, i'm glad you did it. This patchset works
fine for me.