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drm/i915/display: Add APIs to be used by gvt to get the register offsets

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GVT code uses macros for register offsets that require display internal
structures. This makes clean separation of display code and
modularization difficult.

Introduce APIs to abstract offset calculations:
- intel_display_device_pipe_offset()
- intel_display_device_trans_offset()
- intel_display_device_cursor_offset()
- intel_display_device_mmio_base()

These APIs return absolute base offsets for the respective register
groups, allowing GVT to compute MMIO addresses without using internal
macros or struct fields. This prepares the path to separate
display-dependent code from i915/gvt/*.

v2:
- Build GVT APIs only when GVT is actually enabled. (Jani)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com> (#v1)
Link: https://patch.msgid.link/20251219060302.2365123-3-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal
2025-12-19 11:32:55 +05:30
parent 71813ecc84
commit f3255cf449
4 changed files with 57 additions and 0 deletions
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34
drivers/gpu/drm/i915/display/intel_gvt_api.c Normal file
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@@ -0,0 +1,34 @@
// SPDX-License-Identifier: MIT
/*
* Copyright © 2025 Intel Corporation
*/
#include <linux/types.h>
#include "intel_display_core.h"
#include "intel_display_regs.h"
#include "intel_gvt_api.h"
u32 intel_display_device_pipe_offset(struct intel_display *display, enum pipe pipe)
{
return INTEL_DISPLAY_DEVICE_PIPE_OFFSET(display, pipe);
}
EXPORT_SYMBOL_NS_GPL(intel_display_device_pipe_offset, "I915_GVT");
u32 intel_display_device_trans_offset(struct intel_display *display, enum transcoder trans)
{
return INTEL_DISPLAY_DEVICE_TRANS_OFFSET(display, trans);
}
EXPORT_SYMBOL_NS_GPL(intel_display_device_trans_offset, "I915_GVT");
u32 intel_display_device_cursor_offset(struct intel_display *display, enum pipe pipe)
{
return INTEL_DISPLAY_DEVICE_CURSOR_OFFSET(display, pipe);
}
EXPORT_SYMBOL_NS_GPL(intel_display_device_cursor_offset, "I915_GVT");
u32 intel_display_device_mmio_base(struct intel_display *display)
{
return DISPLAY_MMIO_BASE(display);
}
EXPORT_SYMBOL_NS_GPL(intel_display_device_mmio_base, "I915_GVT");