From de28bb67e245dbd7f8ea1c5621e1a30e19001283 Mon Sep 17 00:00:00 2001 From: Vinod Govindapillai Date: Tue, 16 Jun 2026 21:41:31 +0300 Subject: [PATCH] drm/i915/display: update to the BW buddy configuration MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Vinod Govindapillai Reviewed-by: Michał Grzelak Link: https://patch.msgid.link/20260616184131.295013-1-vinod.govindapillai@intel.com --- drivers/gpu/drm/i915/display/intel_display_power.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c index dc3b31200353..8e312f5b9f6d 100644 --- a/drivers/gpu/drm/i915/display/intel_display_power.c +++ b/drivers/gpu/drm/i915/display/intel_display_power.c @@ -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),