Contributors: 4
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jani Nikula |
190 |
96.45% |
7 |
70.00% |
| Michal Wajdeczko |
3 |
1.52% |
1 |
10.00% |
| Lucas De Marchi |
2 |
1.02% |
1 |
10.00% |
| Tvrtko A. Ursulin |
2 |
1.02% |
1 |
10.00% |
| Total |
197 |
|
10 |
|
// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */
#include <drm/drm_print.h>
#include "i915_drv.h"
#include "i915_edram.h"
#include "i915_reg.h"
static u32 gen9_edram_size_mb(struct drm_i915_private *i915, u32 cap)
{
static const u8 ways[8] = { 4, 8, 12, 16, 16, 16, 16, 16 };
static const u8 sets[4] = { 1, 1, 2, 2 };
return EDRAM_NUM_BANKS(cap) *
ways[EDRAM_WAYS_IDX(cap)] *
sets[EDRAM_SETS_IDX(cap)];
}
void i915_edram_detect(struct drm_i915_private *i915)
{
u32 edram_cap = 0;
if (!(IS_HASWELL(i915) || IS_BROADWELL(i915) || GRAPHICS_VER(i915) >= 9))
return;
edram_cap = intel_uncore_read_fw(&i915->uncore, HSW_EDRAM_CAP);
/* NB: We can't write IDICR yet because we don't have gt funcs set up */
if (!(edram_cap & EDRAM_ENABLED))
return;
/*
* The needed capability bits for size calculation are not there with
* pre gen9 so return 128MB always.
*/
if (GRAPHICS_VER(i915) < 9)
i915->edram_size_mb = 128;
else
i915->edram_size_mb = gen9_edram_size_mb(i915, edram_cap);
drm_info(&i915->drm, "Found %uMB of eDRAM\n", i915->edram_size_mb);
}