Hi,
On 05-04-18 15:17, Patrice CHOTARD wrote:
Hi Thierry
On 04/05/2018 11:54 AM, Thierry Reding wrote:
On Fri, Mar 23, 2018 at 10:30:53AM +0900, Kunihiko Hayashi wrote:
Add support to get and control a list of resets for the device
as optional and shared. These resets must be kept de-asserted until
the device is enabled.
This is specified as shared because some SoCs like UniPhier series
have common reset controls with all ahci controller instances.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
---
.../devicetree/bindings/ata/ahci-platform.txt | 1 +
drivers/ata/ahci.h | 1 +
drivers/ata/libahci_platform.c | 24 +++++++++++++++++++---
3 files changed, 23 insertions(+), 3 deletions(-)
This causes a regression on Tegra because we explicitly request the
resets after the call to ahci_platform_get_resources().
I confirm, we got exactly the same behavior on STi platform.
From a quick look, ahci_mtk and ahci_st are in the same boat, adding the
corresponding maintainers to Cc.
Patrice, Matthias: does SATA still work for you after this patch? This
has been in linux-next since next-20180327.
SATA is still working after this patch, but a kernel warning is
triggered due to the fact that resets are both requested by
libahci_platform and by ahci_st driver.
So in your case you might be able to remove the reset handling
from the ahci_st driver and rely on the new libahci_platform
handling instead? If that works that seems like a win to me.
As said elsewhere in this thread I think it makes sense to keep (or re-add
after a revert) the libahci_platform reset code, but make it conditional
on a flag passed to ahci_platform_get_resources(). This way we get
the shared code for most cases and platforms which need special handling
can opt-out.
Regards,
Hans
Patrice
Given how this is one of the more hardware-specific bits, perhaps a
better way to do this is to move reset handling into a Uniphier driver
much like Tegra, Mediatek and ST?
That said, I don't see SATA support for any of the Socionext hardware
either in the DT bindings or drivers/ata, so perhaps it'd be best to
back this out again until we have something that's more well tested?
Thierry
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