media: mediatek: vcodec: Read HW active status from syscon

Remove the requirement of a VDEC_SYS reg iospace for both MT8173 and
MT8183. To achieve that, rely on a vdecsys syscon to be passed through
the DT, and use it to directly read the VDEC_HW_ACTIVE bit during IRQ
handling to check whether the HW is active. Also update the VP8 stateful
decoder to use the syscon, if present, for writes to VDEC_SYS.

The old behavior is still present when reg-names aren't supplied, as
to keep backward compatibility.
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil: added vdecsys_regmap kerneldoc line provided by Nicolas]

drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c

@@ -5,14 +5,17 @@
  *         Tiffany Lin <tiffany.lin@mediatek.com>
  */
 
+#include <linux/bitfield.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/regmap.h>
 #include <media/v4l2-event.h>
 #include <media/v4l2-mem2mem.h>
 #include <media/videobuf2-dma-contig.h>
@@ -39,22 +42,30 @@ static int mtk_vcodec_get_hw_count(struct mtk_vcodec_dev *dev)
 	}
 }
 
+static bool mtk_vcodec_is_hw_active(struct mtk_vcodec_dev *dev)
+{
+	u32 cg_status;
+
+	if (dev->vdecsys_regmap)
+		return !regmap_test_bits(dev->vdecsys_regmap, VDEC_HW_ACTIVE_ADDR,
+					 VDEC_HW_ACTIVE_MASK);
+
+	cg_status = readl(dev->reg_base[VDEC_SYS] + VDEC_HW_ACTIVE_ADDR);
+	return !FIELD_GET(VDEC_HW_ACTIVE_MASK, cg_status);
+}
+
 static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
 {
 	struct mtk_vcodec_dev *dev = priv;
 	struct mtk_vcodec_ctx *ctx;
-	u32 cg_status = 0;
 	unsigned int dec_done_status = 0;
 	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_MISC] +
 					VDEC_IRQ_CFG_REG;
 
 	ctx = mtk_vcodec_get_curr_ctx(dev, MTK_VDEC_CORE);
 
-	/* check if HW active or not */
-	cg_status = readl(dev->reg_base[0] + VDEC_HW_ACTIVE_ADDR);
-	if ((cg_status & VDEC_HW_ACTIVE_MASK) != 0) {
-		mtk_v4l2_err("DEC ISR, VDEC active is not 0x0 (0x%08x)",
-			     cg_status);
+	if (!mtk_vcodec_is_hw_active(dev)) {
+		mtk_v4l2_err("DEC ISR, VDEC active is not 0x0");
 		return IRQ_HANDLED;
 	}
 
@@ -83,6 +94,33 @@ static int mtk_vcodec_get_reg_bases(struct mtk_vcodec_dev *dev)
 {
 	struct platform_device *pdev = dev->plat_dev;
 	int reg_num, i;
+	struct resource *res;
+	bool has_vdecsys_reg;
+	static const char * const mtk_dec_reg_names[] = {
+		"misc",
+		"ld",
+		"top",
+		"cm",
+		"ad",
+		"av",
+		"pp",
+		"hwd",
+		"hwq",
+		"hwb",
+		"hwg"
+	};
+
+	/*
+	 * If we have reg-names in devicetree, this means that we're on a new
+	 * register organization, which implies that the VDEC_SYS iospace gets
+	 * R/W through a syscon (regmap).
+	 * Here we try to get the "misc" iostart only to check if we have reg-names
+	 */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "misc");
+	if (res)
+		has_vdecsys_reg = false;
+	else
+		has_vdecsys_reg = true;
 
 	/* Sizeof(u32) * 4 bytes for each register base. */
 	reg_num = of_property_count_elems_of_size(pdev->dev.of_node, "reg",
@@ -92,12 +130,29 @@ static int mtk_vcodec_get_reg_bases(struct mtk_vcodec_dev *dev)
 		return -EINVAL;
 	}
 
-	for (i = 0; i < reg_num; i++) {
-		dev->reg_base[i] = devm_platform_ioremap_resource(pdev, i);
-		if (IS_ERR(dev->reg_base[i]))
-			return PTR_ERR(dev->reg_base[i]);
+	if (has_vdecsys_reg) {
+		for (i = 0; i < reg_num; i++) {
+			dev->reg_base[i] = devm_platform_ioremap_resource(pdev, i);
+			if (IS_ERR(dev->reg_base[i]))
+				return PTR_ERR(dev->reg_base[i]);
+
+			mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
+		}
+	} else {
+		for (i = 0; i < reg_num; i++) {
+			dev->reg_base[i+1] = devm_platform_ioremap_resource_byname(pdev, mtk_dec_reg_names[i]);
+			if (IS_ERR(dev->reg_base[i+1]))
+				return PTR_ERR(dev->reg_base[i+1]);
 
-		mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
+			mtk_v4l2_debug(2, "reg[%d] base=%p", i+1, dev->reg_base[i+1]);
+		}
+
+		dev->vdecsys_regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+								      "mediatek,vdecsys");
+		if (IS_ERR(dev->vdecsys_regmap)) {
+			dev_err(&pdev->dev, "Missing mediatek,vdecsys property");
+			return PTR_ERR(dev->vdecsys_regmap);
+		}
 	}
 
 	return 0;

drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h

@@ -441,6 +441,7 @@ struct mtk_vcodec_enc_pdata {
  * @reg_base: Mapped address of MTK Vcodec registers.
  * @vdec_pdata: decoder IC-specific data
  * @venc_pdata: encoder IC-specific data
+ * @vdecsys_regmap: VDEC_SYS register space passed through syscon
  *
  * @fw_handler: used to communicate with the firmware.
  * @id_counter: used to identify current opened instance
@@ -489,6 +490,7 @@ struct mtk_vcodec_dev {
 	void __iomem *reg_base[NUM_MAX_VCODEC_REG_BASE];
 	const struct mtk_vcodec_dec_pdata *vdec_pdata;
 	const struct mtk_vcodec_enc_pdata *venc_pdata;
+	struct regmap *vdecsys_regmap;
 
 	struct mtk_vcodec_fw *fw_handler;
 

drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c

@@ -7,6 +7,7 @@
 
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/regmap.h>
 
 #include "mtk_vcodec_dec_hw.h"
 #include "mtk_vcodec_drv.h"
@@ -33,6 +34,20 @@ void __iomem *mtk_vcodec_get_reg_addr(struct mtk_vcodec_ctx *data,
 }
 EXPORT_SYMBOL(mtk_vcodec_get_reg_addr);
 
+int mtk_vcodec_write_vdecsys(struct mtk_vcodec_ctx *ctx, unsigned int reg,
+			     unsigned int val)
+{
+	struct mtk_vcodec_dev *dev = ctx->dev;
+
+	if (dev->vdecsys_regmap)
+		return regmap_write(dev->vdecsys_regmap, reg, val);
+
+	writel(val, dev->reg_base[VDEC_SYS] + reg);
+
+	return 0;
+}
+EXPORT_SYMBOL(mtk_vcodec_write_vdecsys);
+
 int mtk_vcodec_mem_alloc(struct mtk_vcodec_ctx *data,
 			struct mtk_vcodec_mem *mem)
 {

drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h

@@ -70,6 +70,8 @@ extern int mtk_vcodec_dbg;
 
 void __iomem *mtk_vcodec_get_reg_addr(struct mtk_vcodec_ctx *data,
 				unsigned int reg_idx);
+int mtk_vcodec_write_vdecsys(struct mtk_vcodec_ctx *ctx, unsigned int reg,
+			     unsigned int val);
 int mtk_vcodec_mem_alloc(struct mtk_vcodec_ctx *data,
 				struct mtk_vcodec_mem *mem);
 void mtk_vcodec_mem_free(struct mtk_vcodec_ctx *data,

drivers/media/platform/mediatek/vcodec/vdec/vdec_vp8_if.c

@@ -91,7 +91,6 @@ struct vdec_vp8_vsi {
 
 /**
  * struct vdec_vp8_hw_reg_base - HW register base
- * @sys		: base address for sys
  * @misc	: base address for misc
  * @ld		: base address for ld
  * @top		: base address for top
@@ -100,7 +99,6 @@ struct vdec_vp8_vsi {
  * @hwb		: base address for hwb
  */
 struct vdec_vp8_hw_reg_base {
-	void __iomem *sys;
 	void __iomem *misc;
 	void __iomem *ld;
 	void __iomem *top;
@@ -170,7 +168,6 @@ static void get_hw_reg_base(struct vdec_vp8_inst *inst)
 	inst->reg_base.top = mtk_vcodec_get_reg_addr(inst->ctx, VDEC_TOP);
 	inst->reg_base.cm = mtk_vcodec_get_reg_addr(inst->ctx, VDEC_CM);
 	inst->reg_base.hwd = mtk_vcodec_get_reg_addr(inst->ctx, VDEC_HWD);
-	inst->reg_base.sys = mtk_vcodec_get_reg_addr(inst->ctx, VDEC_SYS);
 	inst->reg_base.misc = mtk_vcodec_get_reg_addr(inst->ctx, VDEC_MISC);
 	inst->reg_base.ld = mtk_vcodec_get_reg_addr(inst->ctx, VDEC_LD);
 	inst->reg_base.hwb = mtk_vcodec_get_reg_addr(inst->ctx, VDEC_HWB);
@@ -222,17 +219,16 @@ static void read_hw_segmentation_data(struct vdec_vp8_inst *inst)
 static void enable_hw_rw_function(struct vdec_vp8_inst *inst)
 {
 	u32 val = 0;
-	void __iomem *sys = inst->reg_base.sys;
 	void __iomem *misc = inst->reg_base.misc;
 	void __iomem *ld = inst->reg_base.ld;
 	void __iomem *hwb = inst->reg_base.hwb;
 	void __iomem *hwd = inst->reg_base.hwd;
 
-	writel(0x1, sys + VP8_RW_CKEN_SET);
+	mtk_vcodec_write_vdecsys(inst->ctx, VP8_RW_CKEN_SET, 0x1);
 	writel(0x101, ld + VP8_WO_VLD_SRST);
 	writel(0x101, hwb + VP8_WO_VLD_SRST);
 
-	writel(1, sys);
+	mtk_vcodec_write_vdecsys(inst->ctx, 0, 0x1);
 	val = readl(misc + VP8_RW_MISC_SRST);
 	writel((val & 0xFFFFFFFE), misc + VP8_RW_MISC_SRST);
 
@@ -241,7 +237,7 @@ static void enable_hw_rw_function(struct vdec_vp8_inst *inst)
 	writel(0x71201100, misc + VP8_RW_MISC_FUNC_CON);
 	writel(0x0, ld + VP8_WO_VLD_SRST);
 	writel(0x0, hwb + VP8_WO_VLD_SRST);
-	writel(0x1, sys + VP8_RW_DCM_CON);
+	mtk_vcodec_write_vdecsys(inst->ctx, VP8_RW_DCM_CON, 0x1);
 	writel(0x1, misc + VP8_RW_MISC_DCM_CON);
 	writel(0x1, hwd + VP8_RW_VP8_CTRL);
 }