linux-kernel - [PATCH v6 7/7] drm/mediatek: Add cmdq_insert_backup

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Date: Sun, 26 May 2024 07:29:28 +0800
From: Jason-JH.Lin <jason-jh.lin@...iatek.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Maxime Ripard <mripard@...nel.org>
CC: David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Matthias Brugger <matthias.bgg@...il.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-media@...r.kernel.org>, <linaro-mm-sig@...ts.linaro.org>, "Jason-ch
 Chen" <jason-ch.chen@...iatek.com>, "Jason-JH . Lin"
	<jason-jh.lin@...iatek.com>, Singo Chang <singo.chang@...iatek.com>, "Nancy
 Lin" <nancy.lin@...iatek.com>, Shawn Sung <shawn.sung@...iatek.com>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>, Jeffrey Kardatzke
	<jkardatzke@...gle.com>
Subject: [PATCH v6 7/7] drm/mediatek: Add cmdq_insert_backup_cookie before secure pkt finalize

Add cmdq_insert_backup_cookie to append some commands before EOC:
1. Get GCE HW thread execute count from the GCE HW register.
2. Add 1 to the execute count and then store into a shared memory.
3. Set a software event siganl as secure irq to GCE HW.

Since the value of execute count + 1 is stored in a shared memory,
CMDQ driver in the normal world can use it to handle task done in irq
handler and CMDQ driver in the secure world will use it to schedule
the task slot for each secure thread.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_crtc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_crtc.c b/drivers/gpu/drm/mediatek/mtk_crtc.c
index 59f6263ae806..0df9bf695f65 100644
--- a/drivers/gpu/drm/mediatek/mtk_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_crtc.c
@@ -178,6 +178,7 @@ void mtk_crtc_disable_secure_state(struct drm_crtc *crtc)
 
 	cmdq_sec_pkt_set_data(&mtk_crtc->sec_cmdq_handle, sec_scn);
 
+	cmdq_sec_insert_backup_cookie(&mtk_crtc->sec_cmdq_handle);
 	cmdq_pkt_finalize(&mtk_crtc->sec_cmdq_handle);
 	dma_sync_single_for_device(mtk_crtc->sec_cmdq_client.chan->mbox->dev,
 				   mtk_crtc->sec_cmdq_handle.pa_base,
@@ -795,6 +796,8 @@ static void mtk_crtc_update_config(struct mtk_crtc *mtk_crtc, bool needs_vblank)
 		cmdq_pkt_clear_event(cmdq_handle, mtk_crtc->cmdq_event);
 		cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event, false);
 		mtk_crtc_ddp_config(crtc, cmdq_handle);
+		if (cmdq_handle->sec_data)
+			cmdq_sec_insert_backup_cookie(cmdq_handle);
 		cmdq_pkt_finalize(cmdq_handle);
 		dma_sync_single_for_device(cmdq_client.chan->mbox->dev,
 					   cmdq_handle->pa_base,
-- 
2.18.0