[Intel-xe] [PATCH 2/2] drm/xe: Implement xe DPT slightly differently.

[Jani Nikula]

On Tue, 15 Aug 2023, Maarten Lankhorst <dev at lankhorst.se> wrote:
> Even for 1 line changes like this? (Adding an if that is always true on 
> i915.)

Yes. At the moment the dependencies are pretty complex, because the xe
changes here depend on a lot of xe commits that in turn depend on a
bunch of i915 commits that need to be refactored.

If we can isolate the i915 patches such that they don't depend on
anything and can be queued upstream first thing, it makes our lives
easier.

And obviously it's *much* easier to squash and juggle patches later on
than to split them up.

BR,
Jani.


>
> On 2023-08-15 11:23, Jani Nikula wrote:
>> On Mon, 14 Aug 2023, Rodrigo Vivi <rodrigo.vivi at intel.com> wrote:
>>> On Mon, Aug 14, 2023 at 10:37:44AM +0200, Maarten Lankhorst wrote:
>>>> From: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>>>>
>>>> Just create a dummy to make DPT work.
>>>>
>>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>>>> ---
>>>>   .../drm/i915/display/skl_universal_plane.c    |  3 +-
>>>>   drivers/gpu/drm/xe/Makefile                   |  1 +
>>>>   drivers/gpu/drm/xe/display/xe_dpt.c           | 46 +++++++++++++++++++
>>>>   3 files changed, 49 insertions(+), 1 deletion(-)
>>>>   create mode 100644 drivers/gpu/drm/xe/display/xe_dpt.c
>>>>
>>>> diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
>>>> index c28f4198aa15..9469ec5a0417 100644
>>>> --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
>>>> +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
>>>
>>> We need to make i915 and xe changes in separated patches.
>>> Ideally we make all i915 changes in a way that it could even
>>> go directly to drm-intel-next already...
>> 
>> Yes, please!
>> 
>> BR,
>> Jani.
>> 
>>>
>>> Cc: Jani Nikula <jani.nikula at intel.com>
>>>
>>>> @@ -1010,7 +1010,8 @@ static u32 skl_surf_address(const struct intel_plane_state *plane_state,
>>>>   		 * The DPT object contains only one vma, so the VMA's offset
>>>>   		 * within the DPT is always 0.
>>>>   		 */
>>>> -		drm_WARN_ON(&i915->drm, plane_state->dpt_vma->node.start);
>>>> +		if (plane_state->dpt_vma)
>>>> +			drm_WARN_ON(&i915->drm, plane_state->dpt_vma->node.start);
>>>>   		drm_WARN_ON(&i915->drm, offset & 0x1fffff);
>>>>   		return offset >> 9;
>>>>   	} else {
>>>> diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
>>>> index 6d9196ab275c..33bfe33632db 100644
>>>> --- a/drivers/gpu/drm/xe/Makefile
>>>> +++ b/drivers/gpu/drm/xe/Makefile
>>>> @@ -141,6 +141,7 @@ $(obj)/i915-display/%.o: $(srctree)/drivers/gpu/drm/i915/display/%.c FORCE
>>>>   # Display code specific to xe
>>>>   xe-$(CONFIG_DRM_XE_DISPLAY) += \
>>>>   	xe_display.o \
>>>> +	display/xe_dpt.o \
>>>>   	display/xe_fb_pin.o \
>>>>   	display/xe_hdcp_gsc.o \
>>>>   	display/xe_plane_initial.o \
>>>> diff --git a/drivers/gpu/drm/xe/display/xe_dpt.c b/drivers/gpu/drm/xe/display/xe_dpt.c
>>>> new file mode 100644
>>>> index 000000000000..0695886045e3
>>>> --- /dev/null
>>>> +++ b/drivers/gpu/drm/xe/display/xe_dpt.c
>>>> @@ -0,0 +1,46 @@
>>>> +// SPDX-License-Identifier: MIT
>>>> +/*
>>>> + * Copyright © 2023 Intel Corporation
>>>> + */
>>>> +
>>>> +#include "intel_dpt.h"
>>>> +
>>>> +#include "i915_reg.h"
>>>> +
>>>> +#include "intel_de.h"
>>>> +#include "intel_display.h"
>>>> +#include "intel_display_types.h"
>>>> +
>>>> +void intel_dpt_destroy(struct i915_address_space *vm)
>>>> +{
>>>> +}
>>>> +
>>>> +struct i915_address_space *
>>>> +intel_dpt_create(struct intel_framebuffer *fb)
>>>> +{
>>>> +	return NULL;
>>>> +}
>>>> +
>>>> +void intel_dpt_configure(struct intel_crtc *crtc)
>>>> +{
>>>> +	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
>>>> +
>>>> +	if (DISPLAY_VER(i915) == 14) {
>>>> +		enum pipe pipe = crtc->pipe;
>>>> +		enum plane_id plane_id;
>>>> +
>>>> +		for_each_plane_id_on_crtc(crtc, plane_id) {
>>>> +			if (plane_id == PLANE_CURSOR)
>>>> +				continue;
>>>> +
>>>> +			intel_de_rmw(i915, PLANE_CHICKEN(pipe, plane_id),
>>>> +				     PLANE_CHICKEN_DISABLE_DPT,
>>>> +				     i915->params.enable_dpt ? 0 : PLANE_CHICKEN_DISABLE_DPT);
>>>> +		}
>>>> +	} else if (DISPLAY_VER(i915) == 13) {
>>>> +		intel_de_rmw(i915, CHICKEN_MISC_2,
>>>> +			     CHICKEN_MISC_DISABLE_DPT,
>>>> +			     i915->params.enable_dpt ? 0 : CHICKEN_MISC_DISABLE_DPT);
>>>> +	}
>>>> +}
>>>> +
>>>> -- 
>>>> 2.39.2
>>>>
>> 

-- 
Jani Nikula, Intel Open Source Graphics Center