drivers/media/platform/verisilicon/hantro_g2.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/verisilicon/hantro_g2.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/verisilicon/hantro_g2.c
Extension
.c
Size
3838 bytes
Lines
138
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Hantro VPU codec driver
 *
 * Copyright (C) 2021 Collabora Ltd, Andrzej Pietrasiewicz <andrzej.p@collabora.com>
 */

#include <linux/delay.h>
#include "hantro_hw.h"
#include "hantro_g2_regs.h"

#define G2_ALIGN	16

static bool hantro_g2_active(struct hantro_ctx *ctx)
{
	struct hantro_dev *vpu = ctx->dev;
	u32 status;

	status = vdpu_read(vpu, G2_REG_INTERRUPT);

	return (status & G2_REG_INTERRUPT_DEC_E);
}

/**
 * hantro_g2_reset:
 * @ctx: the hantro context
 *
 * Emulates a reset using Hantro abort function. Failing this procedure would
 * results in programming a running IP which leads to CPU hang.
 *
 * Using a hard reset procedure instead is prefferred.
 */
void hantro_g2_reset(struct hantro_ctx *ctx)
{
	struct hantro_dev *vpu = ctx->dev;
	u32 status;

	status = vdpu_read(vpu, G2_REG_INTERRUPT);
	if (status & G2_REG_INTERRUPT_DEC_E) {
		dev_warn_ratelimited(vpu->dev, "device still running, aborting");
		status |= G2_REG_INTERRUPT_DEC_ABORT_E | G2_REG_INTERRUPT_DEC_IRQ_DIS;
		vdpu_write(vpu, status, G2_REG_INTERRUPT);

		do {
			mdelay(1);
		} while (hantro_g2_active(ctx));
	}
}

irqreturn_t hantro_g2_irq(int irq, void *dev_id)
{
	struct hantro_dev *vpu = dev_id;
	u32 status;

	status = vdpu_read(vpu, G2_REG_INTERRUPT);

	if (!(status & G2_REG_INTERRUPT_DEC_IRQ))
		return IRQ_NONE;

	hantro_reg_write(vpu, &g2_dec_irq, 0);
	hantro_reg_write(vpu, &g2_dec_int_stat, 0);
	hantro_reg_write(vpu, &g2_clk_gate_e, 1);

	if (status & G2_REG_INTERRUPT_DEC_RDY_INT) {
		hantro_irq_done(vpu, VB2_BUF_STATE_DONE);
		return IRQ_HANDLED;
	}

	if (status & G2_REG_INTERRUPT_DEC_ABORT_INT) {
		/* disabled on abort, though lets be safe and handle it */
		dev_warn_ratelimited(vpu->dev, "decode operation aborted.");
		return IRQ_HANDLED;
	}

	if (status & G2_REG_INTERRUPT_DEC_LAST_SLICE_INT)
		dev_warn_ratelimited(vpu->dev, "not all macroblocks were decoded.");

	if (status & G2_REG_INTERRUPT_DEC_BUS_INT)
		dev_warn_ratelimited(vpu->dev, "bus error detected.");

	if (status & G2_REG_INTERRUPT_DEC_ERROR_INT)
		dev_warn_ratelimited(vpu->dev, "decode error detected.");

	if (status & G2_REG_INTERRUPT_DEC_TIMEOUT)
		dev_warn_ratelimited(vpu->dev, "frame decode timed out.");

	/**
	 * If the decoding haven't stopped, let it continue. The hardware timeout
	 * will trigger if it is trully stuck.
	 */

Annotation

Implementation Notes