mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 14:53:58 -04:00
e2b1c3a127
While edram detection ostensibly belongs with the rest of the dram stuff in soc/intel_dram.c, it's only required by i915 core, not display. Extract it to a separate i915_edram.[ch] file. This allows us to drop the edram_size_mb member from struct xe_device. Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patch.msgid.link/612edb7b70755655fbf193ba8af1c539fb93b698.1763578288.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
// 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);
|
|
}
|