[PATCH] pmdomain: qcom: rpmhpd: don't clamp gfx and gmxc before sync_state

[Oleg Keri]

Until rpmhpd's sync_state every vote is clamped to the highest corner,
so that hardware the bootloader left running keeps the rail level it
needs until its driver takes over.  Nothing the bootloader leaves behind
runs on the GPU rails, but the clamp hits them anyway: the GPU clock
controller's probe runtime-resumes and suspends its GFX and GMXC
domains, and from then on both rails are pinned at their highest corner
until sync_state.

On Glymur gfx.lvl has 14 levels and the clamp holds the rail at the top
one, 0x1d0, while the GMU's own performance table ends at level 11,
0x1c4.  With the GPU driver and firmware built in, the GMU boots long
before sync_state, and its CLX DCVS calibration does not survive a gfx
rail held that high: the firmware gives up with HFI_F2H_MSG_ERROR
0x007306c7 (ResMgrCalibrateDcvsLvl), the first HFI_H2F_MSG_GX_BW_PERF_VOTE
times out and the first GPU init fails.  On the Lenovo Yoga Slim 7x
Gen 11 this means the compositor cannot start at first login.  Pinning
gfx at level 11 or 12 instead fails the same way, level 10 and below
boot fine, and pinning gmxc alone has no effect.

Leave gfx and gmxc out of the clamp: they have no bootloader-configured
consumer to protect, and the GMU votes them through its own RSC.

Fixes: 93b6c8d10fad ("drm/msm/a8xx: Enable CLX feature on Adreno X2-85")
Link: https://lore.kernel.org/r/179248663855.32151.9955864156939592299@xxxxxxxxx
Acked-by: Akhil P Oommen <akhilpo@xxxxxxxxxxxxxxxx>
Signed-off-by: Oleg Keri <okerixx@xxxxxxxxx>
---
 drivers/pmdomain/qcom/rpmhpd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pmdomain/qcom/rpmhpd.c b/drivers/pmdomain/qcom/rpmhpd.c
index fa8fed5bd3e5..2c9d4beeffbe 100644
--- a/drivers/pmdomain/qcom/rpmhpd.c
+++ b/drivers/pmdomain/qcom/rpmhpd.c
@@ -1006,7 +1006,7 @@ static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
 	unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
 	unsigned int peer_enabled_corner;
 
-	if (pd->state_synced) {
+	if (pd->state_synced || pd == &gfx || pd == &gmxc) {
 		to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
 	} else {
 		/* Clamp to highest corner if sync_state hasn't happened */

base-commit: 2efb7a11f1aa4d2dc285fe2680cca22cb9f72f64
-- 
2.55.0