This is a note to let you know that I've just added the patch titled
drm/i915/dmc: Don't enable any pipe DMC events
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-dmc-don-t-enable-any-pipe-dmc-events.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 49e0a85ec3441edc6c77aa40206d6e5ee4597efc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Mon, 11 Dec 2023 23:37:47 +0200
Subject: drm/i915/dmc: Don't enable any pipe DMC events
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit 49e0a85ec3441edc6c77aa40206d6e5ee4597efc upstream.
The pipe DMC seems to be making a mess of things in ADL. Various weird
symptoms have been observed such as missing vblank irqs, typicalle
happening when using multiple displays.
Keep all pipe DMC event handlers disabled until needed (which is never
atm). This is also what Windows does on ADL+.
We can also drop DG2 from disable_all_flip_queue_events() since
on DG2 the pipe DMC is the one that handles the flip queue events.
Cc: stable@xxxxxxxxxxxxxxx
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8685
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231211213750.27109-2-ville.syrjala@xxxxxxxxxxxxxxx
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
(cherry picked from commit 648d7be8ecf47b0556e32550145c70db153b16fb)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dmc.c | 43 +++++++++++++++++++++++++++++--
1 file changed, 41 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -389,7 +389,7 @@ disable_all_flip_queue_events(struct drm
enum intel_dmc_id dmc_id;
/* TODO: check if the following applies to all D13+ platforms. */
- if (!IS_DG2(i915) && !IS_TIGERLAKE(i915))
+ if (!IS_TIGERLAKE(i915))
return;
for_each_dmc_id(dmc_id) {
@@ -493,6 +493,45 @@ void intel_dmc_disable_pipe(struct drm_i
intel_de_rmw(i915, PIPEDMC_CONTROL(pipe), PIPEDMC_ENABLE, 0);
}
+static bool is_dmc_evt_ctl_reg(struct drm_i915_private *i915,
+ enum intel_dmc_id dmc_id, i915_reg_t reg)
+{
+ u32 offset = i915_mmio_reg_offset(reg);
+ u32 start = i915_mmio_reg_offset(DMC_EVT_CTL(i915, dmc_id, 0));
+ u32 end = i915_mmio_reg_offset(DMC_EVT_CTL(i915, dmc_id, DMC_EVENT_HANDLER_COUNT_GEN12));
+
+ return offset >= start && offset < end;
+}
+
+static bool disable_dmc_evt(struct drm_i915_private *i915,
+ enum intel_dmc_id dmc_id,
+ i915_reg_t reg, u32 data)
+{
+ if (!is_dmc_evt_ctl_reg(i915, dmc_id, reg))
+ return false;
+
+ /* keep all pipe DMC events disabled by default */
+ if (dmc_id != DMC_FW_MAIN)
+ return true;
+
+ return false;
+}
+
+static u32 dmc_mmiodata(struct drm_i915_private *i915,
+ struct intel_dmc *dmc,
+ enum intel_dmc_id dmc_id, int i)
+{
+ if (disable_dmc_evt(i915, dmc_id,
+ dmc->dmc_info[dmc_id].mmioaddr[i],
+ dmc->dmc_info[dmc_id].mmiodata[i]))
+ return REG_FIELD_PREP(DMC_EVT_CTL_TYPE_MASK,
+ DMC_EVT_CTL_TYPE_EDGE_0_1) |
+ REG_FIELD_PREP(DMC_EVT_CTL_EVENT_ID_MASK,
+ DMC_EVT_CTL_EVENT_ID_FALSE);
+ else
+ return dmc->dmc_info[dmc_id].mmiodata[i];
+}
+
/**
* intel_dmc_load_program() - write the firmware from memory to register.
* @i915: i915 drm device.
@@ -532,7 +571,7 @@ void intel_dmc_load_program(struct drm_i
for_each_dmc_id(dmc_id) {
for (i = 0; i < dmc->dmc_info[dmc_id].mmio_count; i++) {
intel_de_write(i915, dmc->dmc_info[dmc_id].mmioaddr[i],
- dmc->dmc_info[dmc_id].mmiodata[i]);
+ dmc_mmiodata(i915, dmc, dmc_id, i));
}
}
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-6.6/drm-i915-introduce-crtc_state-enhanced_framing.patch
queue-6.6/drm-i915-edp-don-t-write-to-dp_link_bw_set-when-usin.patch
queue-6.6/drm-i915-dmc-don-t-enable-any-pipe-dmc-events.patch
queue-6.6/drm-i915-fix-fec-state-dump.patch
queue-6.6/drm-i915-reject-async-flips-with-bigjoiner.patch
