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authorJemma Denson <jdenson@gmail.com>2017-08-19 14:38:26 +0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-08-20 17:20:30 +0300
commit214824156cc18038beffd7ae592d2613042109a2 (patch)
tree04192822fa3cb9275e20ace2aa02ee984b9b7f2b /drivers/media/pci
parent7112b490af28a979af82e4ba9a4be4b81182b7cd (diff)
downloadlinux-214824156cc18038beffd7ae592d2613042109a2.tar.xz
media: isl6421: add checks for current overflow
This Kaffeine's BZ: https://bugs.kde.org/show_bug.cgi?id=374693 affects SkyStar S2 PCI DVB-S/S2 rev 3.3 device. It could be due to a Kernel bug. While checking the Isil 6421, comparing with its manual, available at: http://www.intersil.com/content/dam/Intersil/documents/isl6/isl6421a.pdf It was noticed that, if the output load is highly capacitive, a different approach is recomended when energizing the LNBf. Also, it is possible to detect if a current overload is happening, by checking an special flag. Add support for it. Tested on Skystar S2. Changes respect override_or option so should still work fine on cx88 based cards which disable dynamic current limit. Changes since v1: v2 - fixed incorrect checking of i2c return values v3 - fix if logic to check if dcl needs re-enabling - respect override_or values which aim to disable dcl - only do long sleep on overload if dcl enabled - add short sleep before re-enabling dcl - only check overload and potentially return EINVAL if device is on v4 - revert v3 sleep logic changes to remove tuning delays Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jemma Denson <jdenson@gmail.com>
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