Merge tag 'drm-intel-next-2025-06-18' of https://gitlab.freedesktop.org/drm/i915/kernel into drm-next

drm/i915 feature pull for v6.17:

Features and functionality:
- Add support for DSC fractional link bpp on DP MST (Imre)
- Add support for simultaneous Panel Replay and Adaptive Sync (Jouni)
- Add support for PTL+ double buffered LUT registers (Chaitanya, Ville)
- Add PIPEDMC event handling in preparation for flip queue (Ville)

Refactoring and cleanups:
- Rename lots of DPLL interfaces to unify them (Suraj)
- Allocate struct intel_display dynamically (Jani)
- Abstract VLV IOSF sideband better (Jani)
- Use str_true_false() helper (Yumeng Fang)
- Refactor DSB code in preparation for flip queue (Ville)
- Use drm_modeset_lock_assert_held() instead of open coding (Luca)
- Remove unused arg from skl_scaler_get_filter_select() (Luca)
- Split out a separate display register header (Jani)
- Abstract DRAM detection better (Jani)
- Convert LPT/WPT SBI sideband to struct intel_display (Jani)

Fixes:
- Fix DSI HS command dispatch with forced pipeline flush (Gareth Yu)
- Fix BMG and LNL+ DP adaptive sync SDP programming (Ankit)
- Fix error path for xe display workqueue allocation (Haoxiang Li)
- Disable DP AUX access probe where not required (Imre)
- Fix DKL PHY access if the port is invalid (Luca)
- Fix PSR2_SU_STATUS access on ADL+ (Jouni)
- Add sanity checks for porch and sync on BXT/GLK DSI (Ville)

DRM core changes:
- Change AUX DPCD access probe address (Imre)
- Refactor EDID quirks, amd make them available to drivers (Imre)
- Add quirk for DPCD access probe (Imre)
- Add DPCD definitions for Panel Replay capabilities (Jouni)

Merges:
- Backmerges to sync with v6.15-rcs and v6.16-rc1 (Jani)

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/fff9f231850ed410bd81b53de43eff0b98240d31@intel.com

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/vlv_sideband.c b/drivers/gpu/drm/i915/display/vlv_sideband.c
new file mode 100644
index 000000000000..e18045f2b89d
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/vlv_sideband.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: MIT
+/* Copyright © 2025 Intel Corporation */
+
+#include <drm/drm_print.h>
+
+#include "intel_display_core.h"
+#include "intel_display_types.h"
+#include "intel_dpio_phy.h"
+#include "vlv_sideband.h"
+
+static enum vlv_iosf_sb_unit vlv_dpio_phy_to_unit(struct intel_display *display,
+						  enum dpio_phy phy)
+{
+	/*
+	 * IOSF_PORT_DPIO: VLV x2 PHY (DP/HDMI B and C), CHV x1 PHY (DP/HDMI D)
+	 * IOSF_PORT_DPIO_2: CHV x2 PHY (DP/HDMI B and C)
+	 */
+	if (display->platform.cherryview)
+		return phy == DPIO_PHY0 ? VLV_IOSF_SB_DPIO_2 : VLV_IOSF_SB_DPIO;
+	else
+		return VLV_IOSF_SB_DPIO;
+}
+
+u32 vlv_dpio_read(struct drm_device *drm, enum dpio_phy phy, int reg)
+{
+	struct intel_display *display = to_intel_display(drm);
+	enum vlv_iosf_sb_unit unit = vlv_dpio_phy_to_unit(display, phy);
+	u32 val;
+
+	val = vlv_iosf_sb_read(drm, unit, reg);
+
+	/*
+	 * FIXME: There might be some registers where all 1's is a valid value,
+	 * so ideally we should check the register offset instead...
+	 */
+	drm_WARN(display->drm, val == 0xffffffff,
+		 "DPIO PHY%d read reg 0x%x == 0x%x\n",
+		 phy, reg, val);
+
+	return val;
+}
+
+void vlv_dpio_write(struct drm_device *drm,
+		    enum dpio_phy phy, int reg, u32 val)
+{
+	struct intel_display *display = to_intel_display(drm);
+	enum vlv_iosf_sb_unit unit = vlv_dpio_phy_to_unit(display, phy);
+
+	vlv_iosf_sb_write(drm, unit, reg, val);
+}