[PW_SID:994327] [v13,1/4] drm/imagination: Use pwrseq for TH1520 GPU power management

Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml

@@ -21,6 +21,11 @@ properties:
           # work with newer dts.
           - const: img,img-axe
           - const: img,img-rogue
+      - items:
+          - enum:
+              - thead,th1520-gpu
+          - const: img,img-bxm-4-64
+          - const: img,img-rogue
       - items:
           - enum:
               - ti,j721s2-gpu
@@ -77,14 +82,18 @@ required:
 additionalProperties: false
 
 allOf:
-  # Constraints added alongside the new compatible strings that would otherwise
-  # create an ABI break.
   - if:
       properties:
         compatible:
           contains:
-            const: img,img-rogue
+            const: img,img-axe-1-16m
     then:
+      properties:
+        power-domains:
+          items:
+            - description: Power domain A
+        power-domain-names:
+          maxItems: 1
       required:
         - power-domains
         - power-domain-names
@@ -93,13 +102,20 @@ allOf:
       properties:
         compatible:
           contains:
-            const: img,img-axe-1-16m
+            const: thead,th1520-gpu
     then:
       properties:
+        clocks:
+          minItems: 3
+        clock-names:
+          minItems: 3
         power-domains:
-          maxItems: 1
-        power-domain-names:
-          maxItems: 1
+          items:
+            - description: The single, unified power domain for the GPU on the
+                TH1520 SoC, integrating all internal IP power domains.
+        power-domain-names: false
+      required:
+        - power-domains
 
   - if:
       properties:
@@ -109,9 +125,14 @@ allOf:
     then:
       properties:
         power-domains:
-          minItems: 2
+          items:
+            - description: Power domain A
+            - description: Power domain B
         power-domain-names:
           minItems: 2
+      required:
+        - power-domains
+        - power-domain-names
 
   - if:
       properties:

arch/riscv/boot/dts/thead/th1520.dtsi

@@ -225,6 +225,13 @@
 		#clock-cells = <0>;
 	};
 
+	gpu_mem_clk: mem-clk {
+		compatible = "fixed-clock";
+		clock-frequency = <0>;
+		clock-output-names = "gpu_mem_clk";
+		#clock-cells = <0>;
+	};
+
 	stmmac_axi_config: stmmac-axi-config {
 		snps,wr_osr_lmt = <15>;
 		snps,rd_osr_lmt = <15>;
@@ -500,6 +507,20 @@
 			#clock-cells = <1>;
 		};
 
+		gpu: gpu@ffef400000 {
+			compatible = "thead,th1520-gpu", "img,img-bxm-4-64",
+				     "img,img-rogue";
+			reg = <0xff 0xef400000 0x0 0x100000>;
+			interrupt-parent = <&plic>;
+			interrupts = <102 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk_vo CLK_GPU_CORE>,
+				 <&gpu_mem_clk>,
+				 <&clk_vo CLK_GPU_CFG_ACLK>;
+			clock-names = "core", "mem", "sys";
+			power-domains = <&aon TH1520_GPU_PD>;
+			resets = <&rst TH1520_RESET_ID_GPU>;
+		};
+
 		rst: reset-controller@ffef528000 {
 			compatible = "thead,th1520-reset";
 			reg = <0xff 0xef528000 0x0 0x4f>;

drivers/gpu/drm/imagination/Kconfig

@@ -3,8 +3,9 @@
 
 config DRM_POWERVR
 	tristate "Imagination Technologies PowerVR (Series 6 and later) & IMG Graphics"
-	depends on ARM64
+	depends on (ARM64 || RISCV && 64BIT)
 	depends on DRM
+	depends on MMU
 	depends on PM
 	select DRM_EXEC
 	select DRM_GEM_SHMEM_HELPER

drivers/gpu/drm/imagination/pvr_device.c

@@ -23,6 +23,7 @@
 #include <linux/firmware.h>
 #include <linux/gfp.h>
 #include <linux/interrupt.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
@@ -121,21 +122,6 @@ static int pvr_device_clk_init(struct pvr_device *pvr_dev)
 	return 0;
 }
 
-static int pvr_device_reset_init(struct pvr_device *pvr_dev)
-{
-	struct drm_device *drm_dev = from_pvr_device(pvr_dev);
-	struct reset_control *reset;
-
-	reset = devm_reset_control_get_optional_exclusive(drm_dev->dev, NULL);
-	if (IS_ERR(reset))
-		return dev_err_probe(drm_dev->dev, PTR_ERR(reset),
-				     "failed to get gpu reset line\n");
-
-	pvr_dev->reset = reset;
-
-	return 0;
-}
-
 /**
  * pvr_device_process_active_queues() - Process all queue related events.
  * @pvr_dev: PowerVR device to check
@@ -618,6 +604,9 @@ pvr_device_init(struct pvr_device *pvr_dev)
 	struct device *dev = drm_dev->dev;
 	int err;
 
+	/* Get the platform-specific data based on the compatible string. */
+	pvr_dev->device_data = of_device_get_match_data(dev);
+
 	/*
 	 * Setup device parameters. We do this first in case other steps
 	 * depend on them.
@@ -631,8 +620,7 @@ pvr_device_init(struct pvr_device *pvr_dev)
 	if (err)
 		return err;
 
-	/* Get the reset line for the GPU */
-	err = pvr_device_reset_init(pvr_dev);
+	err = pvr_dev->device_data->pwr_ops->init(pvr_dev);
 	if (err)
 		return err;
 

drivers/gpu/drm/imagination/pvr_device.h

@@ -37,6 +37,9 @@ struct clk;
 /* Forward declaration from <linux/firmware.h>. */
 struct firmware;
 
+/* Forward declaration from <linux/pwrseq/consumer.h> */
+struct pwrseq_desc;
+
 /**
  * struct pvr_gpu_id - Hardware GPU ID information for a PowerVR device
  * @b: Branch ID.
@@ -57,6 +60,14 @@ struct pvr_fw_version {
 	u16 major, minor;
 };
 
+/**
+ * struct pvr_device_data - Platform specific data associated with a compatible string.
+ * @pwr_ops: Pointer to a structure with platform-specific power functions.
+ */
+struct pvr_device_data {
+	const struct pvr_power_sequence_ops *pwr_ops;
+};
+
 /**
  * struct pvr_device - powervr-specific wrapper for &struct drm_device
  */
@@ -98,6 +109,9 @@ struct pvr_device {
 	/** @fw_version: Firmware version detected at runtime. */
 	struct pvr_fw_version fw_version;
 
+	/** @device_data: Pointer to platform-specific data. */
+	const struct pvr_device_data *device_data;
+
 	/** @regs_resource: Resource representing device control registers. */
 	struct resource *regs_resource;
 
@@ -148,6 +162,9 @@ struct pvr_device {
 	 */
 	struct reset_control *reset;
 
+	/** @pwrseq: Pointer to a power sequencer, if one is used. */
+	struct pwrseq_desc *pwrseq;
+
 	/** @irq: IRQ number. */
 	int irq;
 

drivers/gpu/drm/imagination/pvr_drv.c

@@ -1480,15 +1480,33 @@ static void pvr_remove(struct platform_device *plat_dev)
 	pvr_power_domains_fini(pvr_dev);
 }
 
+static const struct pvr_device_data pvr_device_data_manual = {
+	.pwr_ops = &pvr_power_sequence_ops_manual,
+};
+
+static const struct pvr_device_data pvr_device_data_pwrseq = {
+	.pwr_ops = &pvr_power_sequence_ops_pwrseq,
+};
+
 static const struct of_device_id dt_match[] = {
-	{ .compatible = "img,img-rogue", .data = NULL },
+	{
+		.compatible = "thead,th1520-gpu",
+		.data = &pvr_device_data_pwrseq,
+	},
+	{
+		.compatible = "img,img-rogue",
+		.data = &pvr_device_data_manual,
+	},
 
 	/*
 	 * This legacy compatible string was introduced early on before the more generic
 	 * "img,img-rogue" was added. Keep it around here for compatibility, but never use
 	 * "img,img-axe" in new devicetrees.
 	 */
-	{ .compatible = "img,img-axe", .data = NULL },
+	{
+		.compatible = "img,img-axe",
+		.data = &pvr_device_data_manual,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, dt_match);
@@ -1513,4 +1531,5 @@ MODULE_DESCRIPTION(PVR_DRIVER_DESC);
 MODULE_LICENSE("Dual MIT/GPL");
 MODULE_IMPORT_NS("DMA_BUF");
 MODULE_FIRMWARE("powervr/rogue_33.15.11.3_v1.fw");
+MODULE_FIRMWARE("powervr/rogue_36.52.104.182_v1.fw");
 MODULE_FIRMWARE("powervr/rogue_36.53.104.796_v1.fw");