diff options
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_buffer.c | 11 | ||||
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 8 | ||||
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_gpu.h | 1 |
3 files changed, 15 insertions, 5 deletions
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c index cf741c5c82d2..384df1659be6 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c @@ -53,11 +53,12 @@ static inline void CMD_END(struct etnaviv_cmdbuf *buffer) OUT(buffer, VIV_FE_END_HEADER_OP_END); } -static inline void CMD_WAIT(struct etnaviv_cmdbuf *buffer) +static inline void CMD_WAIT(struct etnaviv_cmdbuf *buffer, + unsigned int waitcycles) { buffer->user_size = ALIGN(buffer->user_size, 8); - OUT(buffer, VIV_FE_WAIT_HEADER_OP_WAIT | 200); + OUT(buffer, VIV_FE_WAIT_HEADER_OP_WAIT | waitcycles); } static inline void CMD_LINK(struct etnaviv_cmdbuf *buffer, @@ -168,7 +169,7 @@ u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu) /* initialize buffer */ buffer->user_size = 0; - CMD_WAIT(buffer); + CMD_WAIT(buffer, gpu->fe_waitcycles); CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer, &gpu->mmu_context->cmdbuf_mapping) + buffer->user_size - 4); @@ -320,7 +321,7 @@ void etnaviv_sync_point_queue(struct etnaviv_gpu *gpu, unsigned int event) CMD_END(buffer); /* Append waitlink */ - CMD_WAIT(buffer); + CMD_WAIT(buffer, gpu->fe_waitcycles); CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer, &gpu->mmu_context->cmdbuf_mapping) + buffer->user_size - 4); @@ -503,7 +504,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) | VIVS_GL_EVENT_FROM_PE); - CMD_WAIT(buffer); + CMD_WAIT(buffer, gpu->fe_waitcycles); CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer, &gpu->mmu_context->cmdbuf_mapping) + buffer->user_size - 4); diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c index de8c9894967c..63b929b1e5d1 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c @@ -493,6 +493,14 @@ static void etnaviv_gpu_update_clock(struct etnaviv_gpu *gpu) clock |= VIVS_HI_CLOCK_CONTROL_FSCALE_VAL(fscale); etnaviv_gpu_load_clock(gpu, clock); } + + /* + * Choose number of wait cycles to target a ~30us (1/32768) max latency + * until new work is picked up by the FE when it polls in the idle loop. + * If the GPU base frequency is unknown use 200 wait cycles. + */ + gpu->fe_waitcycles = clamp(gpu->base_rate_core >> (15 - gpu->freq_scale), + 200UL, 0xffffUL); } static int etnaviv_hw_reset(struct etnaviv_gpu *gpu) diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h index 98c6f9c320fc..e1e1de59c38d 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h @@ -150,6 +150,7 @@ struct etnaviv_gpu { struct clk *clk_shader; unsigned int freq_scale; + unsigned int fe_waitcycles; unsigned long base_rate_core; unsigned long base_rate_shader; }; |