5.15-stable review patch. If anyone has any objections, please let me know.
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From: Ville Syrjälä ville.syrjala@linux.intel.com
commit 7b1f6b5aaec0f849e19c3e99d4eea75876853cdd upstream.
Currently we always reprogram CDCLK from the intel_set_cdclk_pre_plane_update() when using squash/crawl. The code only works correctly for the cd2x update or full modeset cases, and it was simply never updated to deal with squash/crawl.
If the CDCLK frequency is increasing we must reprogram it before we do anything else that might depend on the new higher frequency, and conversely we must not decrease the frequency until everything that might still depend on the old higher frequency has been dealt with.
Since cdclk_state->pipe is only relevant when doing a cd2x update we can't use it to determine the correct sequence during squash/crawl. To that end introduce cdclk_state->disable_pipes which simply indicates that we must perform the update while the pipes are disable (ie. during intel_set_cdclk_pre_plane_update()). Otherwise we use the same old vs. new CDCLK frequency comparsiong as for cd2x updates.
The only remaining problem case is when the voltage_level needs to increase due to a DDI port, but the CDCLK frequency is decreasing (and not all pipes are being disabled). The current approach will not bump the voltage level up until after the port has already been enabled, which is too late. But we'll take care of that case separately.
v2: Don't break the "must disable pipes case" v3: Keep the on stack 'pipe' for future use
Cc: stable@vger.kernel.org Fixes: d62686ba3b54 ("drm/i915/adl_p: CDCLK crawl support for ADL") Reviewed-by: Uma Shankar uma.shankar@intel.com Reviewed-by: Gustavo Sousa gustavo.sousa@intel.com Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20240402155016.13733-2-ville.s... (cherry picked from commit 3aecee90ac12a351905f12dda7643d5b0676d6ca) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_cdclk.c | 7 +++++-- drivers/gpu/drm/i915/display/intel_cdclk.h | 3 +++ 2 files changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c @@ -2000,7 +2000,7 @@ intel_set_cdclk_pre_plane_update(struct &new_cdclk_state->actual)) return;
- if (pipe == INVALID_PIPE || + if (new_cdclk_state->disable_pipes || old_cdclk_state->actual.cdclk <= new_cdclk_state->actual.cdclk) { drm_WARN_ON(&dev_priv->drm, !new_cdclk_state->base.changed);
@@ -2029,7 +2029,7 @@ intel_set_cdclk_post_plane_update(struct &new_cdclk_state->actual)) return;
- if (pipe != INVALID_PIPE && + if (!new_cdclk_state->disable_pipes && old_cdclk_state->actual.cdclk > new_cdclk_state->actual.cdclk) { drm_WARN_ON(&dev_priv->drm, !new_cdclk_state->base.changed);
@@ -2456,6 +2456,7 @@ static struct intel_global_state *intel_ return NULL;
cdclk_state->pipe = INVALID_PIPE; + cdclk_state->disable_pipes = false;
return &cdclk_state->base; } @@ -2575,6 +2576,8 @@ int intel_modeset_calc_cdclk(struct inte if (ret) return ret;
+ new_cdclk_state->disable_pipes = true; + drm_dbg_kms(&dev_priv->drm, "Modeset required for cdclk change\n"); } --- a/drivers/gpu/drm/i915/display/intel_cdclk.h +++ b/drivers/gpu/drm/i915/display/intel_cdclk.h @@ -52,6 +52,9 @@ struct intel_cdclk_state {
/* bitmask of active pipes */ u8 active_pipes; + + /* update cdclk with pipes disabled */ + bool disable_pipes; };
int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state);