Merge tag 'drm-intel-next-2023-09-29' of git://anongit.freedesktop.org/drm/drm-intel into drm-next

drm/i915 feature pull for v6.7:

Features and functionality:
- Early Xe2 LPD / Lunarlake (LNL) display enabling (Lucas, Matt, Gustavo,
  Stanislav, Luca, Clint, Juha-Pekka, Balasubramani, Ravi)
- Plenty of various DSC improvements and fixes (Ankit)
- Add DSC PPS state readout and verification (Suraj)
- Improve fastsets for VRR, LRR and M/N updates (Ville)
- Use connector->ddc to create (non-DP MST) connector sysfs ddc symlinks (Ville)
- Various DSB improvements, load LUTs using DSB (Ville)
- Improve shared link bandwidth management, starting with FDI (Imre)
- Optimize get param ioctl for PXP status (Alan)
- Remove DG2 pre-production hardware workarounds (Matt)
- Add more RPL P/U PCI IDs (Dnyaneshwar)
- Add new DG2-G12 stepping (Swati)
- Add PSR sink error status to debugfs (Jouni)
- Add DP enhanced framing to crtc state checker (Ville)

Refactoring and cleanups:
- Simplify TileY/Tile4 tiling selftest enumeration (Matt)
- Remove some unused power domain code (Gustavo)
- Check stepping of display IP version rather than MTL platform (Matt)
- DP audio compute config cleanups (Vinod)
- SDVO cleanups and refactoring, more robust failure handling (Ville)
- Color register definition and readout cleanups (Jani)
- Reduce header interdependencies for frontbuffer tracking (Jani)
- Continue replacing struct edid with struct drm_edid (Jani)
- Use source physical address instead of EDID for CEC (Jani)
- Clean up Type-C port lane count functions (Luca)
- Clean up DSC PPS register definitions and readout (Jani)
- Stop using GEM_BUG_ON()/GEM_WARN_ON() in display code (Jani)
- Move more of the display probe to display code (Jani)
- Remove redundant runtime suspended state flag (Jouni)
- Move display info printing to display code (Balasubramani)
- Frontbuffer tracking improvements (Jouni)
- Add trailing newlines to debug logging (Jim Cromie)
- Separate display workarounds from clock gating init (Matt)
- Reduce dmesg log spamming for combo PHY, PLL state, FEC, DP MST (Ville, Imre)

Fixes:
- Fix hotplug poll detect loops via suspend/resume (Imre)
- Fix hotplug detect for forced connectors (Imre)
- Fix DSC first_line_bpg_offset calculation (Suraj)
- Fix debug prints for SDP CRC16 (Arun)
- Fix PXP runtime resume (Alan)
- Fix cx0 PHY lane handling (Gustavo)
- Fix frontbuffer tracking locking in debugfs (Juha-Pekka)
- Fix SDVO detect on some models (Ville)
- Fix SDP split configuration for DP MST (Vinod)
- Fix AUX usage and reads for HDCP on DP MST (Suraj)
- Fix PSR workaround (Jouni)
- Fix redundant AUX power get/put in DP force (Imre)
- Fix ICL DSI TCLK POST by letting hardware handle it (William)
- Fix IRQ reset for XE LP+ (Gustavo)
- Fix h/vsync_end instead of h/vtotal in VBT (Ville)
- Fix C20 PHY msgbus timeout issues (Gustavo)
- Fix pre-TGL FEC pipe A vs. DDI A mixup (Ville)
- Fix FEC state readout for DP MST (Ville)

DRM subsystem core changes:
- Assume sink supports 8 bpc when DSC is supported (Ankit)
- Add drm_edid_is_digital() helper (Jani)
- Parse source physical address from EDID (Jani)
- Add function to attach CEC without EDID (Jani)
- Reorder connector sysfs/debugfs remove (Ville)
- Register connector sysfs ddc symlink later (Ville)

Media subsystem changes:
- Add comments about CEC source physical address usage (Jani)

Merges:
- Backmerge drm-next to get v6.6-rc1 (Jani)

Signed-off-by: Dave Airlie <airlied@redhat.com>

# Conflicts:
#	drivers/gpu/drm/i915/i915_drv.h
From: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/87r0mhi7a6.fsf@intel.com

1 files changed, 212 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_link_bw.c b/drivers/gpu/drm/i915/display/intel_link_bw.c
new file mode 100644
index 000000000000..c5eb5f242536
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_link_bw.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include "i915_drv.h"
+
+#include "intel_atomic.h"
+#include "intel_display_types.h"
+#include "intel_fdi.h"
+#include "intel_link_bw.h"
+
+/**
+ * intel_link_bw_init_limits - initialize BW limits
+ * @i915: device instance
+ * @limits: link BW limits
+ *
+ * Initialize @limits.
+ */
+void intel_link_bw_init_limits(struct drm_i915_private *i915, struct intel_link_bw_limits *limits)
+{
+	enum pipe pipe;
+
+	limits->bpp_limit_reached_pipes = 0;
+	for_each_pipe(i915, pipe)
+		limits->max_bpp_x16[pipe] = INT_MAX;
+}
+
+/**
+ * intel_link_bw_reduce_bpp - reduce maximum link bpp for a selected pipe
+ * @state: atomic state
+ * @limits: link BW limits
+ * @pipe_mask: mask of pipes to select from
+ * @reason: explanation of why bpp reduction is needed
+ *
+ * Select the pipe from @pipe_mask with the biggest link bpp value and set the
+ * maximum of link bpp in @limits below this value. Modeset the selected pipe,
+ * so that its state will get recomputed.
+ *
+ * This function can be called to resolve a link's BW overallocation by reducing
+ * the link bpp of one pipe on the link and hence reducing the total link BW.
+ *
+ * Returns
+ *   - 0 in case of success
+ *   - %-ENOSPC if no pipe can further reduce its link bpp
+ *   - Other negative error, if modesetting the selected pipe failed
+ */
+int intel_link_bw_reduce_bpp(struct intel_atomic_state *state,
+			     struct intel_link_bw_limits *limits,
+			     u8 pipe_mask,
+			     const char *reason)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	enum pipe max_bpp_pipe = INVALID_PIPE;
+	struct intel_crtc *crtc;
+	int max_bpp = 0;
+
+	for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, pipe_mask) {
+		struct intel_crtc_state *crtc_state;
+		int link_bpp;
+
+		if (limits->bpp_limit_reached_pipes & BIT(crtc->pipe))
+			continue;
+
+		crtc_state = intel_atomic_get_crtc_state(&state->base,
+							 crtc);
+		if (IS_ERR(crtc_state))
+			return PTR_ERR(crtc_state);
+
+		if (crtc_state->dsc.compression_enable)
+			link_bpp = crtc_state->dsc.compressed_bpp;
+		else
+			/*
+			 * TODO: for YUV420 the actual link bpp is only half
+			 * of the pipe bpp value. The MST encoder's BW allocation
+			 * is based on the pipe bpp value, set the actual link bpp
+			 * limit here once the MST BW allocation is fixed.
+			 */
+			link_bpp = crtc_state->pipe_bpp;
+
+		if (link_bpp > max_bpp) {
+			max_bpp = link_bpp;
+			max_bpp_pipe = crtc->pipe;
+		}
+	}
+
+	if (max_bpp_pipe == INVALID_PIPE)
+		return -ENOSPC;
+
+	limits->max_bpp_x16[max_bpp_pipe] = to_bpp_x16(max_bpp) - 1;
+
+	return intel_modeset_pipes_in_mask_early(state, reason,
+						 BIT(max_bpp_pipe));
+}
+
+/**
+ * intel_link_bw_set_bpp_limit_for_pipe - set link bpp limit for a pipe to its minimum
+ * @state: atomic state
+ * @old_limits: link BW limits
+ * @new_limits: link BW limits
+ * @pipe: pipe
+ *
+ * Set the link bpp limit for @pipe in @new_limits to its value in
+ * @old_limits and mark this limit as the minimum. This function must be
+ * called after a pipe's compute config function failed, @old_limits
+ * containing the bpp limit with which compute config previously passed.
+ *
+ * The function will fail if setting a minimum is not possible, either
+ * because the old and new limits match (and so would lead to a pipe compute
+ * config failure) or the limit is already at the minimum.
+ *
+ * Returns %true in case of success.
+ */
+bool
+intel_link_bw_set_bpp_limit_for_pipe(struct intel_atomic_state *state,
+				     const struct intel_link_bw_limits *old_limits,
+				     struct intel_link_bw_limits *new_limits,
+				     enum pipe pipe)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+
+	if (pipe == INVALID_PIPE)
+		return false;
+
+	if (new_limits->max_bpp_x16[pipe] ==
+	    old_limits->max_bpp_x16[pipe])
+		return false;
+
+	if (drm_WARN_ON(&i915->drm,
+			new_limits->bpp_limit_reached_pipes & BIT(pipe)))
+		return false;
+
+	new_limits->max_bpp_x16[pipe] =
+		old_limits->max_bpp_x16[pipe];
+	new_limits->bpp_limit_reached_pipes |= BIT(pipe);
+
+	return true;
+}
+
+static int check_all_link_config(struct intel_atomic_state *state,
+				 struct intel_link_bw_limits *limits)
+{
+	/* TODO: Check additional shared display link configurations like MST */
+	int ret;
+
+	ret = intel_fdi_atomic_check_link(state, limits);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static bool
+assert_link_limit_change_valid(struct drm_i915_private *i915,
+			       const struct intel_link_bw_limits *old_limits,
+			       const struct intel_link_bw_limits *new_limits)
+{
+	bool bpps_changed = false;
+	enum pipe pipe;
+
+	for_each_pipe(i915, pipe) {
+		/* The bpp limit can only decrease. */
+		if (drm_WARN_ON(&i915->drm,
+				new_limits->max_bpp_x16[pipe] >
+				old_limits->max_bpp_x16[pipe]))
+			return false;
+
+		if (new_limits->max_bpp_x16[pipe] <
+		    old_limits->max_bpp_x16[pipe])
+			bpps_changed = true;
+	}
+
+	/* At least one limit must change. */
+	if (drm_WARN_ON(&i915->drm,
+			!bpps_changed))
+		return false;
+
+	return true;
+}
+
+/**
+ * intel_link_bw_atomic_check - check display link states and set a fallback config if needed
+ * @state: atomic state
+ * @new_limits: link BW limits
+ *
+ * Check the configuration of all shared display links in @state and set new BW
+ * limits in @new_limits if there is a BW limitation.
+ *
+ * Returns:
+ *   - 0 if the confugration is valid
+ *   - %-EAGAIN, if the configuration is invalid and @new_limits got updated
+ *     with fallback values with which the configuration of all CRTCs
+ *     in @state must be recomputed
+ *   - Other negative error, if the configuration is invalid without a
+ *     fallback possibility, or the check failed for another reason
+ */
+int intel_link_bw_atomic_check(struct intel_atomic_state *state,
+			       struct intel_link_bw_limits *new_limits)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_link_bw_limits old_limits = *new_limits;
+	int ret;
+
+	ret = check_all_link_config(state, new_limits);
+	if (ret != -EAGAIN)
+		return ret;
+
+	if (!assert_link_limit_change_valid(i915, &old_limits, new_limits))
+		return -EINVAL;
+
+	return -EAGAIN;
+}