On 4/14/2023 12:35 AM, Marijn Suijten wrote:
On 2023-04-12 10:33:15, Abhinav Kumar wrote:
[..]
What happens if a device boots without DSC panel connected? Will
CTL_DSC_FLUSH be zero and not (unnecessarily, I assume) flush any of the
DSC blocks? Or could this flush uninitialized state to the block?
If we bootup without DSC panel connected, the kernel's cfg->dsc will be
0 and default register value of CTL_DSC_FLUSH will be 0 so it wont flush
any DSC blocks.
Ack, that makes sense. However, if I connect a DSC panel, then
disconnect it (now the register should be non-zero, but cfg->dsc will be
zero), and then replug a non-DSC panel multiple times, it'll get flushed
every time because we never clear CTL_DSC_FLUSH after that?
If we remove it after kernel starts, that issue is there even today
without that change because DSI is not a hot-pluggable display so a
teardown wont happen when you plug out the panel. How will cfg->dsc be 0
then? In that case, its not a valid test as there was no indication to
DRM that display was disconnected so we cannot tear it down.
Sure, as I wrote in the other response, we can move this
to reset_intf_cfg later when the other pieces are fixed. And leave a
FIXME here.
Kuogee forgot to CC me on this patchs so I did not read/receive that
side of the email thread. Will catch up before reviewing v2.
- Marijn
