On 2023-09-14 13:53, Hamza Mahfooz wrote:
> On eDP we can receive invalid modes from dm_update_crtc_state() for
> entirely new streams for which drm_mode_set_crtcinfo() shouldn't be
> called on. So, instead of calling drm_mode_set_crtcinfo() from within
> create_stream_for_sink() we can instead call it from
> amdgpu_dm_connector_mode_valid(). Since, we are guaranteed to only call
> drm_mode_set_crtcinfo() for valid modes from that function (invalid
> modes are rejected by that callback) and that is the only user
> of create_validate_stream_for_sink() that we need to call
> drm_mode_set_crtcinfo() for (as before commit cb841d27b876
> ("drm/amd/display: Always pass connector_state to stream validation"),
> that is the only place where create_validate_stream_for_sink()'s
> dm_state was NULL).
>
I don't seem to see how a NULL dm_state in
create_validate_stream_for_sink() (or create_stream_for_sink() for that
matter) has an impact on the drm_mode_set_crtcinfo() call. That one depends
on !old_stream and &mode.
It does look like &mode is an empty mode if we can't find a preferred_mode,
though. Not sure if that can cause an issue.
Harry
> Cc: [email protected]
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2693
> Fixes: cb841d27b876 ("drm/amd/display: Always pass connector_state to stream validation")
> Signed-off-by: Hamza Mahfooz <[email protected]>
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 933c9b5d5252..beef4fef7338 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -6128,8 +6128,6 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
>
> if (recalculate_timing)
> drm_mode_set_crtcinfo(&saved_mode, 0);
> - else if (!old_stream)
> - drm_mode_set_crtcinfo(&mode, 0);
>
> /*
> * If scaling is enabled and refresh rate didn't change
> @@ -6691,6 +6689,8 @@ enum drm_mode_status amdgpu_dm_connector_mode_valid(struct drm_connector *connec
> goto fail;
> }
>
> + drm_mode_set_crtcinfo(mode, 0);
> +
> stream = create_validate_stream_for_sink(aconnector, mode,
> to_dm_connector_state(connector->state),
> NULL);
On 9/14/23 16:40, Harry Wentland wrote:
> On 2023-09-14 13:53, Hamza Mahfooz wrote:
>> On eDP we can receive invalid modes from dm_update_crtc_state() for
>> entirely new streams for which drm_mode_set_crtcinfo() shouldn't be
>> called on. So, instead of calling drm_mode_set_crtcinfo() from within
>> create_stream_for_sink() we can instead call it from
>> amdgpu_dm_connector_mode_valid(). Since, we are guaranteed to only call
>> drm_mode_set_crtcinfo() for valid modes from that function (invalid
>> modes are rejected by that callback) and that is the only user
>> of create_validate_stream_for_sink() that we need to call
>> drm_mode_set_crtcinfo() for (as before commit cb841d27b876
>> ("drm/amd/display: Always pass connector_state to stream validation"),
>> that is the only place where create_validate_stream_for_sink()'s
>> dm_state was NULL).
>>
>
> I don't seem to see how a NULL dm_state in
> create_validate_stream_for_sink() (or create_stream_for_sink() for that
> matter) has an impact on the drm_mode_set_crtcinfo() call. That one depends
> on !old_stream and &mode.
If we look back to commit 4a2df0d1f28e ("drm/amd/display: Fixed
non-native modes not lighting up") it seems like the intent was to only
have drm_mode_set_crtcinfo() called for
amdgpu_dm_connector_mode_valid(). Since, even if we go that far back
create_stream_for_sink()'s dm_state was only NULL when it was called
from amdgpu_dm_connector_mode_valid().
>
> It does look like &mode is an empty mode if we can't find a preferred_mode,
> though. Not sure if that can cause an issue.
I don't think it should be an issue, since before commit 4a2df0d1f28e
("drm/amd/display: Fixed non-native modes not lighting up") we always
called drm_mode_set_crtcinfo() in the aforementioned case (and only for
that case).
>
> Harry
>
>> Cc: [email protected]
>> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2693
>> Fixes: cb841d27b876 ("drm/amd/display: Always pass connector_state to stream validation")
>> Signed-off-by: Hamza Mahfooz <[email protected]>
>> ---
>> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> index 933c9b5d5252..beef4fef7338 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -6128,8 +6128,6 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
>>
>> if (recalculate_timing)
>> drm_mode_set_crtcinfo(&saved_mode, 0);
>> - else if (!old_stream)
>> - drm_mode_set_crtcinfo(&mode, 0);
>>
>> /*
>> * If scaling is enabled and refresh rate didn't change
>> @@ -6691,6 +6689,8 @@ enum drm_mode_status amdgpu_dm_connector_mode_valid(struct drm_connector *connec
>> goto fail;
>> }
>>
>> + drm_mode_set_crtcinfo(mode, 0);
>> +
>> stream = create_validate_stream_for_sink(aconnector, mode,
>> to_dm_connector_state(connector->state),
>> NULL);
>
--
Hamza