media: atomisp: return errors from ia_css_dma_configure_from_info()

Now that the pipeline config functions can return errors, change
ia_css_dma_configure_from_info() and callers in order for them
to return errors at pipelines instead of using assert().

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: add return codes for pipeline config functions

Those functions can internally break, but, as they don't return
errors, internally there are some assert() calls, which is bad,
as it hangs the driver.

So, add return codes there, in preparation for removing such
assert() calls.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: propagate errors at ia_css_*_configure()

Propagate the lower lever ia_css config errors to the next
level.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: print a warning if error while setting downscaler

As warned by gcc:

drivers/staging/media/atomisp//pci/isp/kernels/dvs/dvs_1.0/ia_css_dvs.host.c:237:31: warning: variable ‘isp_data_ptr’ set but not used [-Wunused-but-set-variable]

ia_css_vf_configure() logic has an error var that detects troubles
when setting the kernel for downscaling. The driver just ignores
it, without producing any warning. Add at least a warning message
on such cases.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: fix "dubious: !x | !y" sparse warning

Upon running Sparse, "warning: dubious: !x | !y" is brought to notice
for this file. Logical and bitwise OR are basically the same in this
context, so it doesn't cause a runtime bug. But let's change it to
logical OR to make it a little bit cleaner and silence the Sparse
warning.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: add SPDX headers

This driver is licensed under GPL 2.0, as stated inside their
headers.

Add the proper tag there. We should probably latter cleanup
the reduntant licensing text, but this could be done later,
after we get rid of other abstraction layers.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: get rid of non-Linux error codes

The atomisp driver has its own error codes under the
ia_css_err.h file. On several places, those got already
replaced by standard error codes, but there are still a
lot more to be fixed.

Let's get rid of all of those, mapping them into
the already-existing set of Linux error codes.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: atomisp: cleanup directory hierarchy

This driver has very long directories without a good
reason (IMHO). Let's drop two directories from such hierarchy,
in order to simplify things a little bit and make the dir
output a bit more readable.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>