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.
> + "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 :-)
> + }
> +
> + return simple_read_from_buffer(user_buf, count, ppos, buf, len);
> +}
Regards,
Hans
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