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Message-ID: <20180625161522.mwl3bhiuly4bkdsh@flea>
Date: Mon, 25 Jun 2018 18:15:22 +0200
From: Maxime Ripard <maxime.ripard@...tlin.com>
To: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc: hans.verkuil@...co.com, acourbot@...omium.org,
sakari.ailus@...ux.intel.com,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
tfiga@...omium.org, posciak@...omium.org,
Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
nicolas.dufresne@...labora.com, jenskuske@...il.com,
linux-sunxi@...glegroups.com,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 7/9] media: cedrus: Move IRQ maintainance to
cedrus_dec_ops
On Mon, Jun 25, 2018 at 04:18:51PM +0200, Paul Kocialkowski wrote:
> 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:
> > > 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 <paul.kocialkowski@...tlin.com>
>
> Scratch that for now, I just thought of something here (see below).
>
> > > Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
> > > ---
> > > .../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.
Yeah, I noticed this already and this was fixed for the v2 :)
Maxime
--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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