From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Tue, 13 Feb 2018 22:46:58 -0800
Subject: drm/msm: Trigger fence completion from GPU
Git-commit: 79d57bf6fa3bcc0ec5fc3b8140c4df1d696f593b
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Interrupt commands causes the CP to trigger an interrupt as the command
is processed, regardless of the GPU being done processing previous
commands. This is seen by the interrupt being delivered before the
fence is written on 8974 and is likely the cause of the additional
CP_WAIT_FOR_IDLE workaround found for a306, which would cause the CP to
wait for the GPU to go idle before triggering the interrupt.
Instead we can set the (undocumented) BIT(31) of the CACHE_FLUSH_TS
which will cause a special CACHE_FLUSH_TS interrupt to be triggered from
the GPU as the write event is processed.
Add CACHE_FLUSH_TS to the IRQ masks of A3xx and A4xx and remove the
workaround for A306.
Suggested-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 1 +
drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 1 +
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 18 ++----------------
3 files changed, 4 insertions(+), 16 deletions(-)
--- a/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a3xx_gpu.c
@@ -35,6 +35,7 @@
A3XX_INT0_CP_RB_INT | \
A3XX_INT0_CP_REG_PROTECT_FAULT | \
A3XX_INT0_CP_AHB_ERROR_HALT | \
+ A3XX_INT0_CACHE_FLUSH_TS | \
A3XX_INT0_UCHE_OOB_ACCESS)
extern bool hang_debug;
--- a/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a4xx_gpu.c
@@ -27,6 +27,7 @@
A4XX_INT0_CP_RB_INT | \
A4XX_INT0_CP_REG_PROTECT_FAULT | \
A4XX_INT0_CP_AHB_ERROR_HALT | \
+ A4XX_INT0_CACHE_FLUSH_TS | \
A4XX_INT0_UCHE_OOB_ACCESS)
extern bool hang_debug;
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -313,26 +313,12 @@ void adreno_submit(struct msm_gpu *gpu,
OUT_RING(ring, 0x00000000);
}
+ /* BIT(31) of CACHE_FLUSH_TS triggers CACHE_FLUSH_TS IRQ from GPU */
OUT_PKT3(ring, CP_EVENT_WRITE, 3);
- OUT_RING(ring, CACHE_FLUSH_TS);
+ OUT_RING(ring, CACHE_FLUSH_TS | BIT(31));
OUT_RING(ring, rbmemptr(ring, fence));
OUT_RING(ring, submit->seqno);
- /* we could maybe be clever and only CP_COND_EXEC the interrupt: */
- OUT_PKT3(ring, CP_INTERRUPT, 1);
- OUT_RING(ring, 0x80000000);
-
- /* Workaround for missing irq issue on 8x16/a306. Unsure if the
- * root cause is a platform issue or some a306 quirk, but this
- * keeps things humming along:
- */
- if (adreno_is_a306(adreno_gpu)) {
- OUT_PKT3(ring, CP_WAIT_FOR_IDLE, 1);
- OUT_RING(ring, 0x00000000);
- OUT_PKT3(ring, CP_INTERRUPT, 1);
- OUT_RING(ring, 0x80000000);
- }
-
#if 0
if (adreno_is_a3xx(adreno_gpu)) {
/* Dummy set-constant to trigger context rollover */