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authorMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-05-20 12:00:22 +0200
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-05-20 12:32:23 +0200
commit113d2bac408b8f7168532afaed88097df1d260ce (patch)
tree815e1ca048fa8a2c6e74e51e5277fdfd97234d60
parent7451385ef565ae05f27b667b89f2b8fde9c11e05 (diff)
media: atomisp: update TODO with the current data
The TODO list doesn't reflect the current status of the driver. Update it. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
-rw-r--r--drivers/staging/media/atomisp/TODO53
1 files changed, 34 insertions, 19 deletions
diff --git a/drivers/staging/media/atomisp/TODO b/drivers/staging/media/atomisp/TODO
index e2fba1ca0a12..52683a704223 100644
--- a/drivers/staging/media/atomisp/TODO
+++ b/drivers/staging/media/atomisp/TODO
@@ -1,9 +1,9 @@
-1. A single AtomISP driver needs to be implemented to support both BYT and
- CHT platforms. The current driver is a mechanical and hand combined merge
- of the two using an ifdef ISP2401 to select the CHT version, which at the
- moment is not enabled. Eventually this should become a runtime if check,
- but there are some quite tricky things that need sorting out before that
- will be possible.
+1. A single AtomISP driver needs to be implemented to support both
+ Baytrail (BYT and Cherrytail (CHT) platforms at the same time.
+ The current driver is a mechanical and hand combined merge of the
+ two using several runtime macros, plus some ifdef ISP2401 to select the
+ CHT version. Yet, there are some ISP-specific headers that change the
+ driver's behavior during compile time.
2. The file structure needs to get tidied up to resemble a normal Linux
driver.
@@ -12,25 +12,29 @@
3. The sensor drivers read MIPI settings from EFI variables or default to the
settings hard-coded in the platform data file for different platforms.
- This isn't ideal but may be hard to improve as this is how existing
- platforms work.
+ It should be possible to improve it, by adding support for _DSM tables.
-4. The sensor drivers use the regulator framework API. In the ideal world it
- would be using ACPI but that's not how the existing devices work.
+4. The sensor drivers use PMIC and the regulator framework API. In the ideal
+ world it would be using ACPI but that's not how the existing devices work.
5. The AtomISP driver includes some special IOCTLS (ATOMISP_IOC_XXXX_XXXX)
- that may need some cleaning up.
+ and controls that require some cleanup.
6. Correct Coding Style. Please don't send coding style patches for this
driver until the other work is done.
-7. The ISP code depends on the exact FW version. The version defined in
- BYT:
- drivers/staging/media/atomisp/pci/atomisp2/pci/sh_css_firmware.c
- static const char *release_version = STR(irci_stable_candrpv_0415_20150521_0458);
+7. The ISP code has some dependencies of the exact FW version.
+ The version defined in pci/sh_css_firmware.c:
+ BYT:
+ static const char *isp2400_release_version = STR(irci_stable_candrpv_0415_20150521_0458);
+
CHT:
- drivers/staging/media/atomisp/pci/atomisp2/css/sh_css_firmware.c
- static const char *release_version = STR(irci_ecr-master_20150911_0724);
+ static const char *isp2401_release_version = STR(irci_ecr - master_20150911_0724);
+
+ Those versions don't seem to be available anymore. On the tests we've
+ done so far, this version also seems to work for isp2401:
+
+ irci_stable_candrpv_0415_20150521_0458
At some point we may need to round up a few driver versions and see if
there are any specific things that can be done to fold in support for
@@ -50,12 +54,23 @@
11. Switch from videobuf1 to videobuf2. Videobuf1 is being removed!
+12. There are some memory management code that seems to be
+ forked from Kernel 3.10 inside hmm/ directory. Get rid of it,
+ making the driver to use a more standard memory management module.
+
+13. While the driver probes the hardware and reports itself as a
+ V4L2 driver, there are still some issues preventing it to
+ stream (at least it doesn't with the standard V4L2 applications.
+ Didn't test yet with some custom-made app for this driver).
+ Solving the related bugs and issues preventing it to work is
+ needed.
+
Limitations:
1. To test the patches, you also need the ISP firmware
- for BYT:/lib/firmware/shisp_2400b0_v21.bin
- for CHT:/lib/firmware/shisp_2401a0_v21.bin
+ for BYT: /lib/firmware/shisp_2400b0_v21.bin
+ for CHT: /lib/firmware/shisp_2401a0_v21.bin
The firmware files will usually be found in /etc/firmware on an Android
device but can also be extracted from the upgrade kit if you've managed

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