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drm/i915/display: update to the BW buddy configuration

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Bspec has been updated for xe2_lpd+ platforms on how to handle
the bw buddy programming in case no matching memory configuration
is found w.r.t the current page mask table. The recommendation
is to keep the default settings for the related registers as it
is without explicitly disabling the bw buddy.

v2: removed extra explanation

v3: fixed typo in commit message

Bspec: 68871
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/20260616184131.295013-1-vinod.govindapillai@intel.com
This commit is contained in:
Vinod Govindapillai 2026-06-16 21:41:31 +03:00
parent 4a68c7516c
commit de28bb67e2
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/i915/display/intel_display_power.c
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@ -1802,9 +1802,12 @@ static void tgl_bw_buddy_init(struct intel_display *display)
if (table[config].page_mask == 0) {
drm_dbg_kms(display->drm,
"Unknown memory configuration; disabling address buddy logic.\n");
for_each_set_bit(i, &abox_mask, BITS_PER_TYPE(abox_mask))
intel_de_write(display, BW_BUDDY_CTL(i),
BW_BUDDY_DISABLE);
if (DISPLAY_VER(display) < 20) {
for_each_set_bit(i, &abox_mask, BITS_PER_TYPE(abox_mask))
intel_de_write(display, BW_BUDDY_CTL(i),
BW_BUDDY_DISABLE);
}
} else {
for_each_set_bit(i, &abox_mask, BITS_PER_TYPE(abox_mask)) {
intel_de_write(display, BW_BUDDY_PAGE_MASK(i),