Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
Reviewed-by: Christian Gmeiner <cgmei...@igalia.com>
---
drivers/gpu/drm/etnaviv/etnaviv_buffer.c | 11 ++++++-----
drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 7 +++++++
drivers/gpu/drm/etnaviv/etnaviv_gpu.h | 1 +
3 files changed, 14 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 41aab1aa330b..8c20dff32240 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -493,6 +493,13 @@ 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.
+ */
+ gpu->fe_waitcycles = min(gpu->base_rate_core >> (15 - gpu->freq_scale),
+ 0xffffUL);