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drm/i915/dsb: Load LUTs using the DSB during vblank

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Loading LUTs with the DSB outside of vblank doesn't really
work due to the palette anti-collision logic. Apparently the
DSB register writes don't get stalled like CPU mmio writes
do and instead we end up corrupting the LUT entries. Disabling
the anti-collision logic would allow us to successfully load
the LUT outside of vblank, but presumably that risks the LUT
reads from the scanout (temporarily) getting corrupted data
from the LUT instead.

The anti-collision logic isn't active during vblank so that
is when we can successfully load the LUT with the DSB. That is
what we want to do anyway to avoid tearing.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606191504.18099-13-ville.syrjala@linux.intel.com
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
This commit is contained in:
Ville Syrjälä 2023-06-06 22:14:57 +03:00
parent dd1c3eae58
commit 5ae0da3fc7
4 changed files with 32 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/gpu/drm/i915/display/intel_color.c
View File

@ -1741,12 +1741,6 @@ static void icl_load_luts(const struct intel_crtc_state *crtc_state)
MISSING_CASE(crtc_state->gamma_mode);
break;
}
if (crtc_state->dsb) {
intel_dsb_finish(crtc_state->dsb);
intel_dsb_commit(crtc_state->dsb, false);
intel_dsb_wait(crtc_state->dsb);
}
}
static void vlv_load_luts(const struct intel_crtc_state *crtc_state)
@ -1853,6 +1847,9 @@ void intel_color_load_luts(const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
if (crtc_state->dsb)
return;
i915->display.funcs.color->load_luts(crtc_state);
}
@ -1869,6 +1866,9 @@ void intel_color_commit_arm(const struct intel_crtc_state *crtc_state)
struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
i915->display.funcs.color->color_commit_arm(crtc_state);
if (crtc_state->dsb)
intel_dsb_commit(crtc_state->dsb, true);
}
void intel_color_post_update(const struct intel_crtc_state *crtc_state)
@ -1882,6 +1882,7 @@ void intel_color_post_update(const struct intel_crtc_state *crtc_state)
void intel_color_prepare_commit(struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *i915 = to_i915(crtc->base.dev);
/* FIXME DSB has issues loading LUTs, disable it for now */
return;
@ -1894,6 +1895,12 @@ void intel_color_prepare_commit(struct intel_crtc_state *crtc_state)
return;
crtc_state->dsb = intel_dsb_prepare(crtc, 1024);
if (!crtc_state->dsb)
return;
i915->display.funcs.color->load_luts(crtc_state);
intel_dsb_finish(crtc_state->dsb);
}
void intel_color_cleanup_commit(struct intel_crtc_state *crtc_state)
@ -1905,6 +1912,17 @@ void intel_color_cleanup_commit(struct intel_crtc_state *crtc_state)
crtc_state->dsb = NULL;
}
void intel_color_wait_commit(const struct intel_crtc_state *crtc_state)
{
if (crtc_state->dsb)
intel_dsb_wait(crtc_state->dsb);
}
bool intel_color_uses_dsb(const struct intel_crtc_state *crtc_state)
{
return crtc_state->dsb;
}
static bool intel_can_preload_luts(const struct intel_crtc_state *new_crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);

2
drivers/gpu/drm/i915/display/intel_color.h
View File

@ -19,6 +19,8 @@ void intel_color_crtc_init(struct intel_crtc *crtc);
int intel_color_check(struct intel_crtc_state *crtc_state);
void intel_color_prepare_commit(struct intel_crtc_state *crtc_state);
void intel_color_cleanup_commit(struct intel_crtc_state *crtc_state);
bool intel_color_uses_dsb(const struct intel_crtc_state *crtc_state);
void intel_color_wait_commit(const struct intel_crtc_state *crtc_state);
void intel_color_commit_noarm(const struct intel_crtc_state *crtc_state);
void intel_color_commit_arm(const struct intel_crtc_state *crtc_state);
void intel_color_post_update(const struct intel_crtc_state *crtc_state);

4
drivers/gpu/drm/i915/display/intel_crtc.c
View File

@ -24,6 +24,7 @@
#include "intel_display_trace.h"
#include "intel_display_types.h"
#include "intel_drrs.h"
#include "intel_dsb.h"
#include "intel_dsi.h"
#include "intel_fifo_underrun.h"
#include "intel_pipe_crc.h"
@ -394,7 +395,8 @@ static bool intel_crtc_needs_vblank_work(const struct intel_crtc_state *crtc_sta
return crtc_state->hw.active &&
!intel_crtc_needs_modeset(crtc_state) &&
!crtc_state->preload_luts &&
intel_crtc_needs_color_update(crtc_state);
intel_crtc_needs_color_update(crtc_state) &&
!intel_color_uses_dsb(crtc_state);
}
static void intel_crtc_vblank_work(struct kthread_work *base)

3
drivers/gpu/drm/i915/display/intel_display.c
View File

@ -77,6 +77,7 @@
#include "intel_dpll_mgr.h"
#include "intel_dpt.h"
#include "intel_drrs.h"
#include "intel_dsb.h"
#include "intel_dsi.h"
#include "intel_dvo.h"
#include "intel_fb.h"
@ -7144,6 +7145,8 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
if (new_crtc_state->do_async_flip)
intel_crtc_disable_flip_done(state, crtc);
intel_color_wait_commit(new_crtc_state);
}
/*