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Date: Thu, 21 Jun 2018 17:35:03 +0200
From: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To: Maxime Ripard <maxime.ripard@...tlin.com>, hans.verkuil@...co.com,
acourbot@...omium.org, sakari.ailus@...ux.intel.com,
Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: 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
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>
> 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);
>
> diff --git a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_mpeg2.c b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_mpeg2.c
> index e25075bb5779..51fa0c0f9bf2 100644
> --- a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_mpeg2.c
> +++ b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_mpeg2.c
> @@ -52,6 +52,36 @@ static const u8 mpeg_default_non_intra_quant[64] = {
>
> #define m_niq(i) ((i << 8) | mpeg_default_non_intra_quant[i])
>
> +static enum sunxi_cedrus_irq_status
> +sunxi_cedrus_mpeg2_irq_status(struct sunxi_cedrus_ctx *ctx)
> +{
> + struct sunxi_cedrus_dev *dev = ctx->dev;
> + u32 reg = sunxi_cedrus_read(dev, VE_MPEG_STATUS) & 0x7;
> +
> + if (!reg)
> + return SUNXI_CEDRUS_IRQ_NONE;
> +
> + if (reg & (BIT(1) | BIT(2)))
> + return SUNXI_CEDRUS_IRQ_ERROR;
> +
> + return SUNXI_CEDRUS_IRQ_OK;
> +}
> +
> +static void sunxi_cedrus_mpeg2_irq_clear(struct sunxi_cedrus_ctx *ctx)
> +{
> + struct sunxi_cedrus_dev *dev = ctx->dev;
> +
> + sunxi_cedrus_write(dev, GENMASK(2, 0), VE_MPEG_STATUS);
> +}
> +
> +static void sunxi_cedrus_mpeg2_irq_disable(struct sunxi_cedrus_ctx *ctx)
> +{
> + struct sunxi_cedrus_dev *dev = ctx->dev;
> + u32 reg = sunxi_cedrus_read(dev, VE_MPEG_CTRL) & ~BIT(3);
> +
> + sunxi_cedrus_write(dev, reg, VE_MPEG_CTRL);
> +}
> +
> static void sunxi_cedrus_mpeg2_setup(struct sunxi_cedrus_ctx *ctx,
> struct sunxi_cedrus_run *run)
> {
> @@ -156,6 +186,9 @@ static void sunxi_cedrus_mpeg2_trigger(struct sunxi_cedrus_ctx *ctx)
> }
>
> struct sunxi_cedrus_dec_ops sunxi_cedrus_dec_ops_mpeg2 = {
> + .irq_clear = sunxi_cedrus_mpeg2_irq_clear,
> + .irq_disable = sunxi_cedrus_mpeg2_irq_disable,
> + .irq_status = sunxi_cedrus_mpeg2_irq_status,
> .setup = sunxi_cedrus_mpeg2_setup,
> .trigger = sunxi_cedrus_mpeg2_trigger,
> };
--
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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