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drm/mediatek: Add pm_runtime support for GCE power control

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Call pm_runtime_resume_and_get() before accessing GCE hardware in
mbox_send_message(), and invoke pm_runtime_put_autosuspend() in the
cmdq callback to release the PM reference and start autosuspend for
GCE. This ensures correct power management for the GCE device.

Fixes: 8afe816b0c99 ("mailbox: mtk-cmdq-mailbox: Implement Runtime PM with autosuspend")
Signed-off-by: Jason-JH Lin <jason-jh.lin@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20250829091727.3745415-3-jason-jh.lin@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Jason-JH Lin 2025-08-29 17:15:59 +08:00 committed by Chun-Kuang Hu
parent 9882a40640
commit afcfb6c847
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/mediatek/mtk_crtc.c
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@ -283,6 +283,10 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
unsigned int i;
unsigned long flags;
/* release GCE HW usage and start autosuspend */
pm_runtime_mark_last_busy(cmdq_cl->chan->mbox->dev);
pm_runtime_put_autosuspend(cmdq_cl->chan->mbox->dev);
if (data->sta < 0)
return;
@ -618,6 +622,9 @@ static void mtk_crtc_update_config(struct mtk_crtc *mtk_crtc, bool needs_vblank)
mtk_crtc->config_updating = false;
spin_unlock_irqrestore(&mtk_crtc->config_lock, flags);
if (pm_runtime_resume_and_get(mtk_crtc->cmdq_client.chan->mbox->dev) < 0)
goto update_config_out;
mbox_send_message(mtk_crtc->cmdq_client.chan, cmdq_handle);
mbox_client_txdone(mtk_crtc->cmdq_client.chan, 0);
goto update_config_out;