Hi Hans,
On Mon, 2016-02-15 at 11:07 +0100, Hans Verkuil wrote:
> Hi Tiffany,
>
> A small review comment below:
>
> On 02/04/2016 12:34 PM, Tiffany Lin wrote:
> > The VPU driver for hw video codec embedded in Mediatek's MT8173 SOCs.
> > It is able to handle video decoding/encoding of in a range of formats.
> > The driver provides with VPU firmware download, memory management and
> > the communication interface between CPU and VPU.
> > For VPU initialization, it will create virtual memory for CPU access and
> > IOMMU address for vcodec hw device access. When a decode/encode instance
> > opens a device node, vpu driver will download vpu firmware to the device.
> > A decode/encode instant will decode/encode a frame using VPU
> > interface to interrupt vpu to handle decoding/encoding jobs.
> >
> > Signed-off-by: Andrew-CT Chen <andrew-ct.chen@xxxxxxxxxxxx>
> > Signed-off-by: Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
> > ---
> > drivers/media/platform/Kconfig | 9 +
> > drivers/media/platform/Makefile | 2 +
> > drivers/media/platform/mtk-vpu/Makefile | 1 +
> > drivers/media/platform/mtk-vpu/mtk_vpu.c | 994 ++++++++++++++++++++++++++++++
> > drivers/media/platform/mtk-vpu/mtk_vpu.h | 167 +++++
> > 5 files changed, 1173 insertions(+)
> > create mode 100644 drivers/media/platform/mtk-vpu/Makefile
> > create mode 100644 drivers/media/platform/mtk-vpu/mtk_vpu.c
> > create mode 100644 drivers/media/platform/mtk-vpu/mtk_vpu.h
> >
>
> <snip>
>
> > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> > new file mode 100644
> > index 0000000..f54fd89
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> > @@ -0,0 +1,994 @@
>
> <snip>
>
> > +static ssize_t vpu_debug_read(struct file *file, char __user *user_buf,
> > + size_t count, loff_t *ppos)
> > +{
> > + char buf[256];
> > + unsigned int len;
> > + unsigned int running, pc, vpu_to_host, host_to_vpu, wdt;
> > + int ret;
> > + struct device *dev = file->private_data;
> > + struct mtk_vpu *vpu = dev_get_drvdata(dev);
> > +
> > + ret = vpu_clock_enable(vpu);
> > + if (ret) {
> > + dev_err(vpu->dev, "[VPU] enable clock failed %d\n", ret);
> > + return 0;
> > + }
> > +
> > + /* vpu register status */
> > + running = vpu_running(vpu);
> > + pc = vpu_cfg_readl(vpu, VPU_PC_REG);
> > + wdt = vpu_cfg_readl(vpu, VPU_WDT_REG);
> > + host_to_vpu = vpu_cfg_readl(vpu, HOST_TO_VPU);
> > + vpu_to_host = vpu_cfg_readl(vpu, VPU_TO_HOST);
> > + vpu_clock_disable(vpu);
> > +
> > + if (running) {
> > + len = sprintf(buf, "VPU is running\n\n"
>
> Please use snprintf.
>
Got it, we will fix this in next version.
> > + "FW Version: %s\n"
> > + "PC: 0x%x\n"
> > + "WDT: 0x%x\n"
> > + "Host to VPU: 0x%x\n"
> > + "VPU to Host: 0x%x\n",
> > + vpu->run.fw_ver, pc, wdt,
> > + host_to_vpu, vpu_to_host);
> > + } else {
> > + len = sprintf(buf, "VPU not running\n");
>
> Ditto.
>
> sprintf always makes me feel uncomfortable :-)
>
Sorry about that, we will check patch series and remove all sprintf in
next version.
> > + }
> > +
> > + return simple_read_from_buffer(user_buf, count, ppos, buf, len);
> > +}
>
> Regards,
>
> Hans
>
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