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drm/i915/dsb: Introduce intel_dsb_chain()

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In order to handle the DEwake tricks without involving
the CPU we need a mechanism by which one DSB can start
another one. Add a basic function to do so. We'll extend
it later with additional code to actually deal with
DEwake.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240624191032.27333-11-ville.syrjala@linux.intel.com
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
This commit is contained in:
Ville Syrjälä 2024-06-24 22:10:28 +03:00
parent 2039809783
commit 06358ccecd
2 changed files with 45 additions and 0 deletions
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42
drivers/gpu/drm/i915/display/intel_dsb.c
View File

@ -500,6 +500,48 @@ static u32 dsb_error_int_en(struct intel_display *display)
return errors;
}
static void _intel_dsb_chain(struct intel_atomic_state *state,
struct intel_dsb *dsb,
struct intel_dsb *chained_dsb,
u32 ctrl)
{
struct intel_display *display = to_intel_display(state->base.dev);
struct intel_crtc *crtc = dsb->crtc;
enum pipe pipe = crtc->pipe;
u32 tail;
if (drm_WARN_ON(display->drm, dsb->id == chained_dsb->id))
return;
tail = chained_dsb->free_pos * 4;
if (drm_WARN_ON(display->drm, !IS_ALIGNED(tail, CACHELINE_BYTES)))
return;
intel_dsb_reg_write(dsb, DSB_CTRL(pipe, chained_dsb->id),
ctrl | DSB_ENABLE);
intel_dsb_reg_write(dsb, DSB_CHICKEN(pipe, chained_dsb->id),
dsb_chicken(state, crtc));
intel_dsb_reg_write(dsb, DSB_INTERRUPT(pipe, chained_dsb->id),
dsb_error_int_status(display) | DSB_PROG_INT_STATUS |
dsb_error_int_en(display));
intel_dsb_reg_write(dsb, DSB_HEAD(pipe, chained_dsb->id),
intel_dsb_buffer_ggtt_offset(&chained_dsb->dsb_buf));
intel_dsb_reg_write(dsb, DSB_TAIL(pipe, chained_dsb->id),
intel_dsb_buffer_ggtt_offset(&chained_dsb->dsb_buf) + tail);
}
void intel_dsb_chain(struct intel_atomic_state *state,
struct intel_dsb *dsb,
struct intel_dsb *chained_dsb)
{
_intel_dsb_chain(state, dsb, chained_dsb,
0);
}
static void _intel_dsb_commit(struct intel_dsb *dsb, u32 ctrl,
int hw_dewake_scanline)
{

3
drivers/gpu/drm/i915/display/intel_dsb.h
View File

@ -45,6 +45,9 @@ void intel_dsb_wait_scanline_in(struct intel_atomic_state *state,
void intel_dsb_wait_scanline_out(struct intel_atomic_state *state,
struct intel_dsb *dsb,
int lower, int upper);
void intel_dsb_chain(struct intel_atomic_state *state,
struct intel_dsb *dsb,
struct intel_dsb *chained_dsb);
void intel_dsb_commit(struct intel_dsb *dsb,
bool wait_for_vblank);