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drm/i915/dsb: Introduce intel_dsb_poll()

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Add a function for emitting a DSB poll instruction. We'll allow
the caller to specify the poll parameters.

v2: s/wait/wait_us/ (Ankit)

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250207223159.14132-6-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä
2025-02-08 00:31:56 +02:00
parent c9178dfba5
commit cdef53897c
2 changed files with 22 additions and 0 deletions
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19
drivers/gpu/drm/i915/display/intel_dsb.c
View File

@@ -459,6 +459,25 @@ void intel_dsb_wait_scanline_out(struct intel_atomic_state *state,
start, end);
}
void intel_dsb_poll(struct intel_dsb *dsb,
i915_reg_t reg, u32 mask, u32 val,
int wait_us, int count)
{
struct intel_crtc *crtc = dsb->crtc;
enum pipe pipe = crtc->pipe;
intel_dsb_reg_write(dsb, DSB_POLLMASK(pipe, dsb->id), mask);
intel_dsb_reg_write(dsb, DSB_POLLFUNC(pipe, dsb->id),
DSB_POLL_ENABLE |
DSB_POLL_WAIT(wait_us) | DSB_POLL_COUNT(count));
intel_dsb_noop(dsb, 5);
intel_dsb_emit(dsb, val,
(DSB_OPCODE_POLL << DSB_OPCODE_SHIFT) |
i915_mmio_reg_offset(reg));
}
static void intel_dsb_align_tail(struct intel_dsb *dsb)
{
u32 aligned_tail, tail;

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

@@ -54,6 +54,9 @@ void intel_dsb_wait_scanline_out(struct intel_atomic_state *state,
int lower, int upper);
void intel_dsb_vblank_evade(struct intel_atomic_state *state,
struct intel_dsb *dsb);
void intel_dsb_poll(struct intel_dsb *dsb,
i915_reg_t reg, u32 mask, u32 val,
int wait_us, int count);
void intel_dsb_chain(struct intel_atomic_state *state,
struct intel_dsb *dsb,
struct intel_dsb *chained_dsb,