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SubjectRe: [PATCH v2, 5/9] media: mtk-jpegenc: Generalize jpeg encode irq interfaces
On Wed, Jun 30, 2021 at 3:28 PM kyrie.wu <kyrie.wu@mediatek.com> wrote:
> Generalizes jpeg encode irq interfaces to support different hardware.
There are some missing pieces for using the code. I guess the patch
needs to be submitted with other patches or needs to further be
divided.

> + * mtk_jpeg_enc_param: General jpeg encoding parameters
> + * @enc_w: image width
> + * @enc_h: image height
> + * @enable_exif: EXIF enable for jpeg encode mode
> + * @enc_quality: destination image quality in encode mode
> + * @enc_format: input image format
> + * @restart_interval: JPEG restart interval for JPEG encoding
> + * @img_stride: jpeg encoder image stride
> + * @mem_stride: jpeg encoder memory stride
> + * @total_encdu: total 8x8 block number
They are not well-aligned.

> +struct mtk_jpeg_enc_param {
> + u32 enc_w;
> + u32 enc_h;
> + u32 enable_exif;
> + u32 enc_quality;
> + u32 enc_format;
> + u32 restart_interval;
> + u32 img_stride;
> + u32 mem_stride;
> + u32 total_encdu;
> +};
They are not used.

> + u32 bs_size;
> + int flags;
They are not used.

> + struct mtk_jpeg_enc_param enc_param;
> + struct mtk_jpeg_ctx *curr_ctx;
They are not used.

> +void mtk_jpeg_put_buf(struct mtk_jpeg_dev *jpeg)
> +{
> + struct mtk_jpeg_ctx *ctx;
> + struct vb2_v4l2_buffer *dst_buffer;
> + struct list_head *temp_entry;
> + struct list_head *pos;
> + struct mtk_jpeg_src_buf *dst_done_buf, *tmp_dst_done_buf;
> + unsigned long flags;
> +
> + ctx = jpeg->hw_param.curr_ctx;
> + if (!ctx) {
> + dev_err(jpeg->dev, "comp_jpeg ctx fail !!!\n");
> + return;
> + }
> +
> + dst_buffer = jpeg->hw_param.dst_buffer;
> + if (!dst_buffer) {
> + dev_err(jpeg->dev, "comp_jpeg dst_buffer fail !!!\n");
> + return;
> + }
The caller "mtk_jpegenc_hw_irq_handler()" doesn't even check ctx and
dst_buffer. Does mtk_jpeg_put_buf() need to validate them?

> + spin_lock_irqsave(&ctx->done_queue_lock, flags);
> + list_add_tail(&dst_done_buf->list, &ctx->dst_done_queue);
> + while (!list_empty(&ctx->dst_done_queue) &&
> + (pos != &ctx->dst_done_queue)) {
Why does it need to compare `pos != &ctx->dst_done_queue`? On a
related note, at the first time, pos will be some garbage data from
stack.

> +irqreturn_t mtk_jpegenc_hw_irq_handler(int irq, void *priv)
No code is using mtk_jpegenc_hw_irq_handler. Have no enough context
to review the code.

> + src_buf = jpeg->hw_param.src_buffer;
> + dst_buf = jpeg->hw_param.dst_buffer;
> + ctx = jpeg->hw_param.curr_ctx;
> + master_jpeg = ctx->jpeg;
Could they be inlined to above where the variables are declared?

> +enum mtk_jpeg_hw_state {
> + MTK_JPEG_HW_IDLE = 0,
> + MTK_JPEG_HW_BUSY = 1,
MTK_JPEG_HW_BUSY is not used.

> @@ -124,13 +135,18 @@ struct mtk_jpeg_dev {
> struct v4l2_m2m_dev *m2m_dev;
> void *alloc_ctx;
> struct video_device *vdev;
> - void __iomem *reg_base;
> struct device *larb;
> struct delayed_work job_timeout_work;
> const struct mtk_jpeg_variant *variant;
>
> + void __iomem *reg_base[MTK_JPEGENC_HW_MAX];
> + int jpegenc_irq;
jpegenc_irq is not used.

> @@ -189,6 +205,12 @@ struct mtk_jpeg_ctx {
> u8 enc_quality;
> u8 restart_interval;
> struct v4l2_ctrl_handler ctrl_hdl;
> +
> + struct list_head dst_done_queue;
> + spinlock_t done_queue_lock; /* spinlock protecting done queue */
> + u32 total_frame_num;
total_frame_num is not used.


Need to double confirm: why sometimes the code uses
jpeg->reg_base[MTK_JPEGENC_HW0] but sometimes jpeg->reg_base[0]?

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