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drm/panthor: Simplify FW fast reset path

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Stop checking the FW halt_status as MCU_STATUS should be sufficient.
This should make the check for successful FW halt and subsequently
setting fast_reset to true more robust.

We should also clear GLB_REQ.GLB_HALT bit only on post-reset prior
to starting the FW and only if we're doing a fast reset, because
the slow reset will re-initialize all FW sections, including the
global interface.

Signed-off-by: Karunika Choo <karunika.choo@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/r/20241119135030.3352939-1-karunika.choo@arm.com
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
This commit is contained in:
Karunika Choo 2024-11-19 13:50:29 +00:00 • committed by Liviu Dudau
parent dd7db8d911
commit 498893bd59
1 changed files with 8 additions and 7 deletions
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15
drivers/gpu/drm/panthor/panthor_fw.c
View file

@ -1098,17 +1098,11 @@ void panthor_fw_pre_reset(struct panthor_device *ptdev, bool on_hang)
panthor_fw_update_reqs(glb_iface, req, GLB_HALT, GLB_HALT);
gpu_write(ptdev, CSF_DOORBELL(CSF_GLB_DOORBELL_ID), 1);
if (!readl_poll_timeout(ptdev->iomem + MCU_STATUS, status,
status == MCU_STATUS_HALT, 10, 100000) &&
glb_iface->output->halt_status == PANTHOR_FW_HALT_OK) {
status == MCU_STATUS_HALT, 10, 100000)) {
ptdev->fw->fast_reset = true;
} else {
drm_warn(&ptdev->base, "Failed to cleanly suspend MCU");
}
/* The FW detects 0 -> 1 transitions. Make sure we reset
* the HALT bit before the FW is rebooted.
*/
panthor_fw_update_reqs(glb_iface, req, 0, GLB_HALT);
}
panthor_job_irq_suspend(&ptdev->fw->irq);
@ -1134,6 +1128,13 @@ int panthor_fw_post_reset(struct panthor_device *ptdev)
* the FW sections. If it fails, go for a full reset.
*/
if (ptdev->fw->fast_reset) {
/* The FW detects 0 -> 1 transitions. Make sure we reset
* the HALT bit before the FW is rebooted.
* This is not needed on a slow reset because FW sections are
* re-initialized.
*/
panthor_fw_update_reqs(glb_iface, req, 0, GLB_HALT);
ret = panthor_fw_start(ptdev);
if (!ret)
goto out;