lkml.org 
[lkml]   [2017]   [May]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 1/8] drm: Add crtc/encoder/bridge->mode_valid() callbacks
From
Date
Hi Daniel,


On 10-05-2017 09:03, Daniel Vetter wrote:
> On Tue, May 09, 2017 at 06:00:08PM +0100, Jose Abreu wrote:
>> This adds a new callback to crtc, encoder and bridge helper functions
>> called mode_valid(). This callback shall be implemented if the
>> corresponding component has some sort of restriction in the modes
>> that can be displayed. A NULL callback implicates that the component
>> can display all the modes.
>>
>> We also change the description of connector->mode_valid() callback
>> so that it matches the existing behaviour: It is never called in
>> atomic check phase.
>>
>> Only the callbacks were implemented to simplify review process,
>> following patches will make use of them.
>>
>> Signed-off-by: Jose Abreu <joabreu@synopsys.com>
>> Cc: Carlos Palminha <palminha@synopsys.com>
>> Cc: Alexey Brodkin <abrodkin@synopsys.com>
>> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Cc: Dave Airlie <airlied@linux.ie>
>> Cc: Andrzej Hajda <a.hajda@samsung.com>
>> Cc: Archit Taneja <architt@codeaurora.org>
>> ---
>>
>> Changes v1->v2:
>> - Change description of connector->mode_valid() (Daniel)
>>
>> include/drm/drm_bridge.h | 20 ++++++++++++++
>> include/drm/drm_modeset_helper_vtables.h | 45 ++++++++++++++++++++++++++++++++
>> 2 files changed, 65 insertions(+)
>>
>> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
>> index fdd82fc..00c6c36 100644
>> --- a/include/drm/drm_bridge.h
>> +++ b/include/drm/drm_bridge.h
>> @@ -59,6 +59,26 @@ struct drm_bridge_funcs {
>> void (*detach)(struct drm_bridge *bridge);
>>
>> /**
>> + * @mode_valid:
>> + *
>> + * This callback is used to check if a specific mode is valid in this
>> + * bridge. This should be implemented if the bridge has some sort of
>> + * restriction in the modes it can display. For example, a given bridge
>> + * may be responsible to set a clock value. If the clock can not
>> + * produce all the values for the available modes then this callback
>> + * can be used to restrict the number of modes to only the ones that
>> + * can be displayed.
>> + *
>> + * This is called at mode probe and at atomic check phase.
>> + *
>> + * RETURNS:
>> + *
>> + * drm_mode_status Enum
>> + */
>> + enum drm_mode_status (*mode_valid)(struct drm_bridge *crtc,
>> + const struct drm_display_mode *mode);
>> +
>> + /**
>> * @mode_fixup:
>> *
>> * This callback is used to validate and adjust a mode. The paramater
>> diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
>> index c01c328..eec2c70 100644
>> --- a/include/drm/drm_modeset_helper_vtables.h
>> +++ b/include/drm/drm_modeset_helper_vtables.h
>> @@ -106,6 +106,26 @@ struct drm_crtc_helper_funcs {
>> void (*commit)(struct drm_crtc *crtc);
>>
>> /**
>> + * @mode_valid:
>> + *
>> + * This callback is used to check if a specific mode is valid in this
>> + * crtc. This should be implemented if the crtc has some sort of
>> + * restriction in the modes it can display. For example, a given crtc
>> + * may be responsible to set a clock value. If the clock can not
>> + * produce all the values for the available modes then this callback
>> + * can be used to restrict the number of modes to only the ones that
>> + * can be displayed.
>> + *
>> + * This is called at mode probe and at atomic check phase.
>> + *
>> + * RETURNS:
>> + *
>> + * drm_mode_status Enum
>> + */
>> + enum drm_mode_status (*mode_valid)(struct drm_crtc *crtc,
>> + const struct drm_display_mode *mode);
>> +
>> + /**
>> * @mode_fixup:
>> *
>> * This callback is used to validate a mode. The parameter mode is the
>> @@ -457,6 +477,26 @@ struct drm_encoder_helper_funcs {
>> void (*dpms)(struct drm_encoder *encoder, int mode);
>>
>> /**
>> + * @mode_valid:
>> + *
>> + * This callback is used to check if a specific mode is valid in this
>> + * encoder. This should be implemented if the encoder has some sort
>> + * of restriction in the modes it can display. For example, a given
>> + * encoder may be responsible to set a clock value. If the clock can
>> + * not produce all the values for the available modes then this callback
>> + * can be used to restrict the number of modes to only the ones that
>> + * can be displayed.
>> + *
>> + * This is called at mode probe and at atomic check phase.
>> + *
>> + * RETURNS:
>> + *
>> + * drm_mode_status Enum
>> + */
>> + enum drm_mode_status (*mode_valid)(struct drm_encoder *crtc,
>> + const struct drm_display_mode *mode);
>> +
>> + /**
>> * @mode_fixup:
>> *
>> * This callback is used to validate and adjust a mode. The parameter
>> @@ -795,6 +835,11 @@ struct drm_connector_helper_funcs {
>> * (which is usually derived from the EDID data block from the sink).
>> * See e.g. drm_helper_probe_single_connector_modes().
>> *
>> + * This callback is never called in atomic check phase so that userspace
>> + * can override kernel sink checks in case of broken EDID with wrong
>> + * limits from the sink. You can use the remaining mode_valid()
>> + * callbacks to validate the mode against your video path.
>> + *
>> * NOTE:
>> *
>> * This only filters the mode list supplied to userspace in the
> Kerneldoc review seems to still be missing. One case that needs to be
> updated is this note here. But there's a pile of other places where we
> reference one of the mode_valid or mode_fixup functions, and they should
> all be updated.
>
> Also, it'd be good to explain what to put into mode_valid and what to put
> into mode_fixup, for objects which have both. I can help with this, but I
> think it'd be good if you make a first round, since that might catch some
> interactions we've missed.
>
> Thanks, Daniel

Ok, I will need some time to review and update this. I think
until the end of this week I will have another version to send.
Thanks!

Best regards,
Jose Miguel Abreu

\
 
 \ /
  Last update: 2017-05-10 21:21    [W:0.071 / U:8.544 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site