Hi,

On Thu, 2018-06-21 at 17:35 +0200, Paul Kocialkowski wrote:

Hi,

On Wed, 2018-06-13 at 16:07 +0200, Maxime Ripard wrote:

quoted

The IRQ handler up until now was hardcoding the use of the MPEG engine to
read the interrupt status, clear it and disable the interrupts.

Obviously, that won't work really well with the introduction of new codecs
that use a separate engine with a separate register set.

In order to make this more future proof, introduce new decodec operations
to deal with the interrupt management. The only one missing is the one to
enable the interrupts in the first place, but that's taken care of by the
trigger hook for now.

Acked-by: Paul Kocialkowski <redacted>

Scratch that for now, I just thought of something here (see below).

quoted

Signed-off-by: Maxime Ripard <redacted>
---
 .../sunxi/cedrus/sunxi_cedrus_common.h        |  9 +++++
 .../platform/sunxi/cedrus/sunxi_cedrus_hw.c   | 21 ++++++------
 .../sunxi/cedrus/sunxi_cedrus_mpeg2.c         | 33 +++++++++++++++++++
 3 files changed, 53 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
index c2e2c92d103b..a2a507eb9fc9 100644
--- a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
+++ b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h

@@ -108,7 +108,16 @@ struct sunxi_cedrus_buffer *vb2_to_cedrus_buffer(const struct vb2_buffer *p)
 	return vb2_v4l2_to_cedrus_buffer(to_vb2_v4l2_buffer(p));
 }
 
+enum sunxi_cedrus_irq_status {
+	SUNXI_CEDRUS_IRQ_NONE,
+	SUNXI_CEDRUS_IRQ_ERROR,
+	SUNXI_CEDRUS_IRQ_OK,
+};
+
 struct sunxi_cedrus_dec_ops {
+	void (*irq_clear)(struct sunxi_cedrus_ctx *ctx);
+	void (*irq_disable)(struct sunxi_cedrus_ctx *ctx);
+	enum sunxi_cedrus_irq_status (*irq_status)(struct sunxi_cedrus_ctx *ctx);
 	void (*setup)(struct sunxi_cedrus_ctx *ctx,
 		      struct sunxi_cedrus_run *run);
 	void (*trigger)(struct sunxi_cedrus_ctx *ctx);

diff --git a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
index bb46a01214e0..6b97cbd2834e 100644
--- a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
+++ b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c

@@ -77,27 +77,28 @@ static irqreturn_t sunxi_cedrus_ve_irq(int irq, void *dev_id)
 	struct sunxi_cedrus_ctx *ctx;
 	struct sunxi_cedrus_buffer *src_buffer, *dst_buffer;
 	struct vb2_v4l2_buffer *src_vb, *dst_vb;
+	enum sunxi_cedrus_irq_status status;
 	unsigned long flags;
-	unsigned int value, status;
 
 	spin_lock_irqsave(&dev->irq_lock, flags);
 
-	/* Disable MPEG interrupts and stop the MPEG engine */
-	value = sunxi_cedrus_read(dev, VE_MPEG_CTRL);
-	sunxi_cedrus_write(dev, value & (~0xf), VE_MPEG_CTRL);
-
-	status = sunxi_cedrus_read(dev, VE_MPEG_STATUS);
-	sunxi_cedrus_write(dev, 0x0000c00f, VE_MPEG_STATUS);
-	sunxi_cedrus_engine_disable(dev);
-
 	ctx = v4l2_m2m_get_curr_priv(dev->m2m_dev);
 	if (!ctx) {
 		pr_err("Instance released before the end of transaction\n");
 		spin_unlock_irqrestore(&dev->irq_lock, flags);
 
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 	}
 
+	status = dev->dec_ops[ctx->current_codec]->irq_status(ctx);
+	if (status == SUNXI_CEDRUS_IRQ_NONE) {
+		spin_unlock_irqrestore(&dev->irq_lock, flags);
+		return IRQ_NONE;
+	}
+
+	dev->dec_ops[ctx->current_codec]->irq_disable(ctx);
+	dev->dec_ops[ctx->current_codec]->irq_clear(ctx);
+
 	src_vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
 	dst_vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);

Later in that file, there is still some checking that the first bit of
status is set:

	/* First bit of MPEG_STATUS indicates success. */
	if (ctx->job_abort || !(status & 0x01))

So !(status & 0x01) must be replaced with status != CEDRUS_IRQ_OK.

It seems that was working "by accident", with CEDRUS_IRQ_OK probably
being set by the compiler to 0x03.

Cheers,

Paul

-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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