Commit cdef5389 authored by Ville Syrjälä's avatar Ville Syrjälä
Browse files

drm/i915/dsb: Introduce intel_dsb_poll() 



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: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250207223159.14132-6-ville.syrjala@linux.intel.com
parent c9178dfb

drivers/gpu/drm/i915/display/intel_dsb.c

+19 −0
Original line number Diff line number Diff line
@@ -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;

drivers/gpu/drm/i915/display/intel_dsb.h

+3 −0
Original line number Diff line number Diff line
@@ -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,