diff options
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dsb.c | 54 |
1 files changed, 32 insertions, 22 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c index c39bae1be89e..1a574c9300b1 100644 --- a/drivers/gpu/drm/i915/display/intel_dsb.c +++ b/drivers/gpu/drm/i915/display/intel_dsb.c @@ -37,9 +37,16 @@ struct intel_dsb { unsigned int free_pos; /* - * ins_start_offset will help to store start dword of the dsb - * instuction and help in identifying the batch of auto-increment - * register. + * Previously emitted DSB instruction. Used to + * identify/adjust the instruction for indexed + * register writes. + */ + u32 ins[2]; + + /* + * Start of the previously emitted DSB instruction. + * Used to adjust the instruction for indexed + * register writes. */ unsigned int ins_start_offset; @@ -215,9 +222,11 @@ static void intel_dsb_emit(struct intel_dsb *dsb, u32 ldw, u32 udw) dsb->free_pos = ALIGN(dsb->free_pos, 2); dsb->ins_start_offset = dsb->free_pos; + dsb->ins[0] = ldw; + dsb->ins[1] = udw; - intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, ldw); - intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, udw); + intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, dsb->ins[0]); + intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, dsb->ins[1]); } static bool intel_dsb_prev_ins_is_write(struct intel_dsb *dsb, @@ -233,10 +242,8 @@ static bool intel_dsb_prev_ins_is_write(struct intel_dsb *dsb, if (dsb->free_pos == 0) return false; - prev_opcode = intel_dsb_buffer_read(&dsb->dsb_buf, - dsb->ins_start_offset + 1) & ~DSB_REG_VALUE_MASK; - prev_reg = intel_dsb_buffer_read(&dsb->dsb_buf, - dsb->ins_start_offset + 1) & DSB_REG_VALUE_MASK; + prev_opcode = dsb->ins[1] & ~DSB_REG_VALUE_MASK; + prev_reg = dsb->ins[1] & DSB_REG_VALUE_MASK; return prev_opcode == opcode && prev_reg == i915_mmio_reg_offset(reg); } @@ -269,8 +276,6 @@ static bool intel_dsb_prev_ins_is_indexed_write(struct intel_dsb *dsb, i915_reg_ void intel_dsb_reg_write(struct intel_dsb *dsb, i915_reg_t reg, u32 val) { - u32 old_val; - /* * For example the buffer will look like below for 3 dwords for auto * increment register: @@ -299,23 +304,27 @@ void intel_dsb_reg_write(struct intel_dsb *dsb, /* convert to indexed write? */ if (intel_dsb_prev_ins_is_mmio_write(dsb, reg)) { - u32 prev_val = intel_dsb_buffer_read(&dsb->dsb_buf, - dsb->ins_start_offset + 0); + u32 prev_val = dsb->ins[0]; - intel_dsb_buffer_write(&dsb->dsb_buf, - dsb->ins_start_offset + 0, 1); /* count */ + dsb->ins[0] = 1; /* count */ + dsb->ins[1] = (DSB_OPCODE_INDEXED_WRITE << DSB_OPCODE_SHIFT) | + i915_mmio_reg_offset(reg); + + intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset + 0, + dsb->ins[0]); intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset + 1, - (DSB_OPCODE_INDEXED_WRITE << DSB_OPCODE_SHIFT) | - i915_mmio_reg_offset(reg)); - intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset + 2, prev_val); + dsb->ins[1]); + intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset + 2, + prev_val); dsb->free_pos++; } intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, val); /* Update the count */ - old_val = intel_dsb_buffer_read(&dsb->dsb_buf, dsb->ins_start_offset); - intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset, old_val + 1); + dsb->ins[0]++; + intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset + 0, + dsb->ins[0]); /* if number of data words is odd, then the last dword should be 0.*/ if (dsb->free_pos & 0x1) @@ -671,6 +680,9 @@ void intel_dsb_wait(struct intel_dsb *dsb) /* Attempt to reset it */ dsb->free_pos = 0; dsb->ins_start_offset = 0; + dsb->ins[0] = 0; + dsb->ins[1] = 0; + intel_de_write_fw(display, DSB_CTRL(pipe, dsb->id), 0); intel_de_write_fw(display, DSB_INTERRUPT(pipe, dsb->id), @@ -727,8 +739,6 @@ struct intel_dsb *intel_dsb_prepare(struct intel_atomic_state *state, dsb->id = dsb_id; dsb->crtc = crtc; dsb->size = size / 4; /* in dwords */ - dsb->free_pos = 0; - dsb->ins_start_offset = 0; dsb->chicken = dsb_chicken(state, crtc); dsb->hw_dewake_scanline = |