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From:   Hsiao Chien Sung <shawn.sung@mediatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        CK Hu <ck.hu@mediatek.com>
CC:     Philipp Zabel <p.zabel@pengutronix.de>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Chen-Yu Tsai <wenst@chromium.org>, Sean Paul <sean@poorly.run>,
        Fei Shao <fshao@chromium.org>,
        Bibby Hsieh <bibby.hsieh@mediatek.com>,
        <dri-devel@lists.freedesktop.org>,
        <linux-mediatek@lists.infradead.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        "Hsiao Chien Sung" <shawn.sung@mediatek.com>
Subject: [PATCH v4 12/17] drm/mediatek: Support CRC in display driver
Date:   Tue, 12 Dec 2023 20:19:52 +0800
Message-ID: <20231212121957.19231-13-shawn.sung@mediatek.com>
In-Reply-To: <20231212121957.19231-1-shawn.sung@mediatek.com>
References: <20231212121957.19231-1-shawn.sung@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Register CRC related function pointers to support
CRC retrieval.

Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c     | 239 ++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_crtc.h     |  39 ++++
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |   3 +
 3 files changed, 281 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index bc4cc75cca18..fad728690db7 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -71,6 +71,9 @@ struct mtk_drm_crtc {
 	/* lock for display hardware access */
 	struct mutex			hw_lock;
 	bool				config_updating;
+
+	struct mtk_ddp_comp		*crc_provider;
+	unsigned int			frames;
 };
 
 struct mtk_crtc_state {
@@ -625,6 +628,14 @@ static void mtk_crtc_ddp_irq(void *data)
 	struct drm_crtc *crtc = data;
 	struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
 	struct mtk_drm_private *priv = crtc->dev->dev_private;
+	struct mtk_ddp_comp *comp = mtk_crtc->crc_provider;
+
+	/*
+	 * crc providers should make sure the crc is always correct
+	 * by resetting it in .crc_read()
+	 */
+	if (crtc->crc.opened)
+		comp->funcs->crc_read(comp->dev);
 
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (!priv->data->shadow_register && !mtk_crtc->cmdq_client.chan)
@@ -636,6 +647,24 @@ static void mtk_crtc_ddp_irq(void *data)
 	if (!priv->data->shadow_register)
 		mtk_crtc_ddp_config(crtc, NULL);
 #endif
+
+	/*
+	 * drm_crtc_add_crc_entry() could take more than 50ms to finish
+	 * put it at the end of the isr
+	 */
+	if (crtc->crc.opened) {
+		/*
+		 * skip the first crc because the first frame is configured by
+		 * mtk_crtc_ddp_hw_init() when atomic enable
+		 */
+		if (++mtk_crtc->frames > 1) {
+			drm_crtc_add_crc_entry(crtc, true,
+					       drm_crtc_vblank_count(crtc),
+					       comp->funcs->crc_entry(comp->dev));
+		}
+	} else {
+		mtk_crtc->frames = 0;
+	}
 	mtk_drm_finish_page_flip(mtk_crtc);
 }
 
@@ -736,6 +765,40 @@ static int mtk_drm_crtc_update_output(struct drm_crtc *crtc,
 	return 0;
 }
 
+static int mtk_drm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src)
+{
+	if (src && strcmp(src, "auto") != 0) {
+		DRM_ERROR("%s(crtc-%d): unknown source '%s'\n",
+			  __func__, drm_crtc_index(crtc), src);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int mtk_drm_crtc_verify_crc_source(struct drm_crtc *crtc,
+					  const char *src,
+					  size_t *cnt)
+{
+	struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
+	struct mtk_ddp_comp *comp = mtk_crtc->crc_provider;
+
+	if (!comp) {
+		DRM_ERROR("%s(crtc-%d): no crc provider\n",
+			  __func__, drm_crtc_index(crtc));
+		return -ENOENT;
+	}
+
+	if (src && strcmp(src, "auto") != 0) {
+		DRM_ERROR("%s(crtc-%d): unknown source '%s'\n",
+			  __func__, drm_crtc_index(crtc), src);
+		return -EINVAL;
+	}
+
+	*cnt = comp->funcs->crc_cnt(comp->dev);
+
+	return 0;
+}
+
 int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plane,
 			     struct mtk_plane_state *state)
 {
@@ -872,6 +935,8 @@ static const struct drm_crtc_funcs mtk_crtc_funcs = {
 	.atomic_destroy_state	= mtk_drm_crtc_destroy_state,
 	.enable_vblank		= mtk_drm_crtc_enable_vblank,
 	.disable_vblank		= mtk_drm_crtc_disable_vblank,
+	.set_crc_source		= mtk_drm_crtc_set_crc_source,
+	.verify_crc_source	= mtk_drm_crtc_verify_crc_source,
 };
 
 static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs = {
@@ -1073,6 +1138,11 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 
 			if (comp->funcs->ctm_set)
 				has_ctm = true;
+
+			if (comp->funcs->crc_cnt &&
+			    comp->funcs->crc_entry &&
+			    comp->funcs->crc_read)
+				mtk_crtc->crc_provider = comp;
 		}
 
 		mtk_ddp_comp_register_vblank_cb(comp, mtk_crtc_ddp_irq,
@@ -1152,3 +1222,172 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 #endif
 	return 0;
 }
+
+void mtk_drm_crc_init(struct mtk_drm_crc *crc,
+		      const u32 *crc_offset_table, size_t crc_count,
+		      u32 reset_offset, u32 reset_mask)
+{
+	crc->ofs = crc_offset_table;
+	crc->cnt = crc_count;
+	crc->rst_ofs = reset_offset;
+	crc->rst_msk = reset_mask;
+	crc->va = kcalloc(crc->cnt, sizeof(*crc->va), GFP_KERNEL);
+	if (!crc->va) {
+		DRM_ERROR("failed to allocate memory for crc\n");
+		crc->cnt = 0;
+	}
+}
+
+void mtk_drm_crc_read(struct mtk_drm_crc *crc, void __iomem *reg)
+{
+	if (!crc->cnt || !crc->ofs || !crc->va)
+		return;
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+	/* sync to see the most up-to-date copy of the DMA buffer */
+	dma_sync_single_for_cpu(crc->cmdq_client.chan->mbox->dev,
+				crc->pa, crc->cnt * sizeof(*crc->va),
+				DMA_FROM_DEVICE);
+#else
+	/* read crc with cpu for the platforms without cmdq */
+	{
+		u32 n;
+
+		for (n = 0; n < crc->cnt; n++)
+			crc->va[n] = readl(reg + crc->ofs[n]);
+
+		n = readl(reg + crc->rst_ofs);
+
+		/* pull reset bit */
+		n |= crc->rst_msk;
+		writel(n, reg + crc->rst_ofs);
+
+		/* release reset bit */
+		n &= ~crc->rst_msk;
+		writel(n, reg + crc->rst_ofs);
+	}
+#endif
+}
+
+void mtk_drm_crc_destroy(struct mtk_drm_crc *crc)
+{
+	if (!crc->cnt)
+		return;
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+	if (crc->pa) {
+		dma_unmap_single(crc->cmdq_client.chan->mbox->dev,
+				 crc->pa, crc->cnt * sizeof(*crc->va),
+				 DMA_TO_DEVICE);
+		crc->pa = 0;
+	}
+	if (crc->cmdq_client.chan) {
+		mtk_drm_cmdq_pkt_destroy(&crc->cmdq_handle);
+		mbox_free_channel(crc->cmdq_client.chan);
+		crc->cmdq_client.chan = NULL;
+	}
+#endif
+	kfree(crc->va);
+	crc->va = NULL;
+	crc->cnt = 0;
+}
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+void mtk_drm_crc_cmdq_create(struct device *dev, struct mtk_drm_crc *crc)
+{
+	int i;
+
+	if (!crc->cnt) {
+		dev_warn(dev, "%s: not support\n", __func__);
+		goto cleanup;
+	}
+
+	if (!crc->ofs) {
+		dev_warn(dev, "%s: not defined\n", __func__);
+		goto cleanup;
+	}
+
+	crc->cmdq_client.client.dev = dev;
+	crc->cmdq_client.client.tx_block = false;
+	crc->cmdq_client.client.knows_txdone = true;
+	crc->cmdq_client.client.rx_callback = NULL;
+	crc->cmdq_client.chan = mbox_request_channel(&crc->cmdq_client.client, 0);
+	if (IS_ERR(crc->cmdq_client.chan)) {
+		dev_warn(dev, "%s: failed to create mailbox client\n", __func__);
+		crc->cmdq_client.chan = NULL;
+		goto cleanup;
+	}
+
+	if (mtk_drm_cmdq_pkt_create(&crc->cmdq_client, &crc->cmdq_handle, PAGE_SIZE)) {
+		dev_warn(dev, "%s: failed to create cmdq packet\n", __func__);
+		goto cleanup;
+	}
+
+	if (!crc->va) {
+		dev_warn(dev, "%s: no memory\n", __func__);
+		goto cleanup;
+	}
+
+	/* map the entry to get a dma address for cmdq to store the crc */
+	crc->pa = dma_map_single(crc->cmdq_client.chan->mbox->dev,
+				 crc->va, crc->cnt * sizeof(*crc->va),
+				 DMA_FROM_DEVICE);
+
+	if (dma_mapping_error(crc->cmdq_client.chan->mbox->dev, crc->pa)) {
+		dev_err(dev, "%s: failed to map dma\n", __func__);
+		goto cleanup;
+	}
+
+	if (crc->cmdq_event)
+		cmdq_pkt_wfe(&crc->cmdq_handle, crc->cmdq_event, true);
+
+	for (i = 0; i < crc->cnt; i++) {
+		/* put crc to spr1 register */
+		cmdq_pkt_read_s(&crc->cmdq_handle, crc->cmdq_reg->subsys,
+				crc->cmdq_reg->offset + crc->ofs[i],
+				CMDQ_THR_SPR_IDX1);
+
+		/* copy spr1 register to physical address of the crc */
+		cmdq_pkt_assign(&crc->cmdq_handle, CMDQ_THR_SPR_IDX0,
+				CMDQ_ADDR_HIGH(crc->pa + i * sizeof(*crc->va)));
+		cmdq_pkt_write_s(&crc->cmdq_handle, CMDQ_THR_SPR_IDX0,
+				 CMDQ_ADDR_LOW(crc->pa + i * sizeof(*crc->va)),
+				 CMDQ_THR_SPR_IDX1);
+	}
+	/* reset crc */
+	mtk_ddp_write_mask(&crc->cmdq_handle, ~0, crc->cmdq_reg, 0,
+			   crc->rst_ofs, crc->rst_msk);
+
+	/* clear reset bit */
+	mtk_ddp_write_mask(&crc->cmdq_handle, 0, crc->cmdq_reg, 0,
+			   crc->rst_ofs, crc->rst_msk);
+
+	/* jump to head of the cmdq packet */
+	cmdq_pkt_jump(&crc->cmdq_handle, crc->cmdq_handle.pa_base);
+
+	return;
+cleanup:
+	mtk_drm_crc_destroy(crc);
+}
+
+void mtk_drm_crc_cmdq_start(struct mtk_drm_crc *crc)
+{
+	if (!crc->cmdq_client.chan)
+		return;
+
+	dma_sync_single_for_device(crc->cmdq_client.chan->mbox->dev,
+				   crc->cmdq_handle.pa_base,
+				   crc->cmdq_handle.cmd_buf_size,
+				   DMA_TO_DEVICE);
+	mbox_send_message(crc->cmdq_client.chan, &crc->cmdq_handle);
+	mbox_client_txdone(crc->cmdq_client.chan, 0);
+}
+
+void mtk_drm_crc_cmdq_stop(struct mtk_drm_crc *crc)
+{
+	if (!crc->cmdq_client.chan)
+		return;
+
+	mbox_flush(crc->cmdq_client.chan, 2000);
+}
+#endif
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
index 96790f8f7a94..3440c154ad1e 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
@@ -15,6 +15,45 @@
 #define MTK_MAX_BPC	10
 #define MTK_MIN_BPC	3
 
+/**
+ * struct mtk_drm_crc - crc related information
+ * @ofs: register offset of crc
+ * @rst_ofs: register offset of crc reset
+ * @rst_msk: register mask of crc reset
+ * @cnt: count of crc
+ * @va: pointer to the start of crc array
+ * @pa: physical address of the crc for gce to access
+ * @cmdq_event: the event to trigger the cmdq
+ * @cmdq_reg: address of the register that cmdq is going to access
+ * @cmdq_client: handler to control cmdq (mbox channel, thread ...etc.)
+ * @cmdq_handle: cmdq packet to store the commands
+ */
+struct mtk_drm_crc {
+	const u32 *ofs;
+	u32 rst_ofs;
+	u32 rst_msk;
+	size_t cnt;
+	u32 *va;
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+	dma_addr_t pa;
+	u32 cmdq_event;
+	struct cmdq_client_reg *cmdq_reg;
+	struct cmdq_client cmdq_client;
+	struct cmdq_pkt cmdq_handle;
+#endif
+};
+
+void mtk_drm_crc_init(struct mtk_drm_crc *crc,
+		      const u32 *crc_offset_table, size_t crc_count,
+		      u32 reset_offset, u32 reset_mask);
+void mtk_drm_crc_read(struct mtk_drm_crc *crc, void __iomem *reg);
+void mtk_drm_crc_destroy(struct mtk_drm_crc *crc);
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+void mtk_drm_crc_cmdq_create(struct device *dev, struct mtk_drm_crc *crc);
+void mtk_drm_crc_cmdq_start(struct mtk_drm_crc *crc);
+void mtk_drm_crc_cmdq_stop(struct mtk_drm_crc *crc);
+#endif
+
 void mtk_drm_crtc_commit(struct drm_crtc *crtc);
 int mtk_drm_crtc_create(struct drm_device *drm_dev,
 			const unsigned int *path,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index 2597dd7ac0d2..38d08796fae4 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -84,6 +84,9 @@ struct mtk_ddp_comp_funcs {
 	void (*add)(struct device *dev, struct mtk_mutex *mutex);
 	void (*remove)(struct device *dev, struct mtk_mutex *mutex);
 	int (*encoder_index)(struct device *dev);
+	size_t (*crc_cnt)(struct device *dev);
+	u32 *(*crc_entry)(struct device *dev);
+	void (*crc_read)(struct device *dev);
 };
 
 struct mtk_ddp_comp {
-- 
2.18.0