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Message-ID: <s7xhbinc4m3le57f3y5je2ejmpxkgwrvukb7u3cjkg3zy4i63r@6fdctkuv5wrz>
Date: Fri, 14 Feb 2025 11:44:57 +0530
From: Jai Luthra <jai.luthra@...ux.dev>
To: Yemike Abhilash Chandra <y-abhilashchandra@...com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, mripard@...nel.org, mchehab@...nel.org, robh@...nel.org,
krzk+dt@...nel.org, conor+dt@...nel.org, devarsht@...com, vaishnav.a@...com,
r-donadkar@...com, u-kumar1@...com
Subject: Re: [RFC PATCH 2/3] media: cadence: csi2rx: Enable csi2rx_err_irq
interrupt and add support for VIDIOC_LOG_STATUS
Hi Abhilash,
On Wed, Feb 12, 2025 at 06:42:43PM +0530, Yemike Abhilash Chandra wrote:
> Enable the csi2rx_err_irq interrupt to record any errors during streaming
> and also add support for VIDIOC_LOG_STATUS ioctl. The VIDIOC_LOG_STATUS
> ioctl can be invoked from user space to retrieve the device status,
> including details about any errors.
>
> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@...com>
> ---
> drivers/media/platform/cadence/cdns-csi2rx.c | 104 ++++++++++++++++++-
> 1 file changed, 103 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> index 4d64df829e75..b3d76f0678fa 100644
> --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> @@ -57,6 +57,28 @@
> #define CSI2RX_LANES_MAX 4
> #define CSI2RX_STREAMS_MAX 4
>
> +#define CSI2RX_ERROR_IRQS_REG 0x28
> +#define CSI2RX_ERROR_IRQS_MASK_REG 0x2C
> +
> +#define CSI2RX_STREAM3_FIFO_OVERFLOW_IRQ BIT(19)
> +#define CSI2RX_STREAM2_FIFO_OVERFLOW_IRQ BIT(18)
> +#define CSI2RX_STREAM1_FIFO_OVERFLOW_IRQ BIT(17)
> +#define CSI2RX_STREAM0_FIFO_OVERFLOW_IRQ BIT(16)
> +#define CSI2RX_FRONT_TRUNC_HDR_IRQ BIT(12)
> +#define CSI2RX_PROT_TRUNCATED_PACKET_IRQ BIT(11)
> +#define CSI2RX_FRONT_LP_NO_PAYLOAD_IRQ BIT(10)
> +#define CSI2RX_SP_INVALID_RCVD_IRQ BIT(9)
> +#define CSI2RX_DATA_ID_IRQ BIT(7)
> +#define CSI2RX_HEADER_CORRECTED_ECC_IRQ BIT(6)
> +#define CSI2RX_HEADER_ECC_IRQ BIT(5)
> +#define CSI2RX_PAYLOAD_CRC_IRQ BIT(4)
> +
> +#define CSI2RX_ECC_ERRORS GENMASK(7, 4)
> +#define CSI2RX_PACKET_ERRORS GENMASK(12, 9)
> +#define CSI2RX_STREAM_ERRORS GENMASK(19, 16)
> +#define CSI2RX_ERRORS (CSI2RX_ECC_ERRORS | CSI2RX_PACKET_ERRORS | \
> + CSI2RX_STREAM_ERRORS)
> +
> enum csi2rx_pads {
> CSI2RX_PAD_SINK,
> CSI2RX_PAD_SOURCE_STREAM0,
> @@ -71,6 +93,28 @@ struct csi2rx_fmt {
> u8 bpp;
> };
>
> +struct csi2rx_event {
> + u32 mask;
> + const char *name;
> +};
> +
> +static const struct csi2rx_event csi2rx_events[] = {
> + { CSI2RX_STREAM3_FIFO_OVERFLOW_IRQ, "Overflow of the Stream 3 FIFO detected" },
> + { CSI2RX_STREAM2_FIFO_OVERFLOW_IRQ, "Overflow of the Stream 2 FIFO detected" },
> + { CSI2RX_STREAM1_FIFO_OVERFLOW_IRQ, "Overflow of the Stream 1 FIFO detected" },
> + { CSI2RX_STREAM0_FIFO_OVERFLOW_IRQ, "Overflow of the Stream 0 FIFO detected" },
> + { CSI2RX_FRONT_TRUNC_HDR_IRQ, "A truncated header [short or long] has been received" },
> + { CSI2RX_PROT_TRUNCATED_PACKET_IRQ, "A truncated long packet has been received" },
> + { CSI2RX_FRONT_LP_NO_PAYLOAD_IRQ, "A truncated long packet has been received. No payload" },
> + { CSI2RX_SP_INVALID_RCVD_IRQ, "A reserved or invalid short packet has been received" },
> + { CSI2RX_DATA_ID_IRQ, "Data ID error in the header packet" },
> + { CSI2RX_HEADER_CORRECTED_ECC_IRQ, "ECC error detected and corrected" },
> + { CSI2RX_HEADER_ECC_IRQ, "Unrecoverable ECC error" },
> + { CSI2RX_PAYLOAD_CRC_IRQ, "CRC error" },
> +};
> +
> +#define CSI2RX_NUM_EVENTS ARRAY_SIZE(csi2rx_events)
> +
> struct csi2rx_priv {
> struct device *dev;
> unsigned int count;
> @@ -95,6 +139,7 @@ struct csi2rx_priv {
> u8 max_lanes;
> u8 max_streams;
> bool has_internal_dphy;
> + u32 events[CSI2RX_NUM_EVENTS];
>
> struct v4l2_subdev subdev;
> struct v4l2_async_notifier notifier;
> @@ -124,6 +169,29 @@ static const struct csi2rx_fmt formats[] = {
> { .code = MEDIA_BUS_FMT_BGR888_1X24, .bpp = 24, },
> };
>
> +static void csi2rx_configure_err_irq_mask(void __iomem *base)
> +{
> + writel(CSI2RX_ERRORS, base + CSI2RX_ERROR_IRQS_MASK_REG);
> +}
> +
> +static irqreturn_t csi2rx_irq_handler(int irq, void *dev_id)
> +{
> + struct csi2rx_priv *csi2rx = dev_id;
> + int i;
> + u32 error_status;
> +
> + error_status = readl(csi2rx->base + CSI2RX_ERROR_IRQS_REG);
> +
> + for (i = 0; i < CSI2RX_NUM_EVENTS; i++)
> + if (error_status & csi2rx_events[i].mask)
> + csi2rx->events[i]++;
> +
> + writel(CSI2RX_ERRORS & error_status,
> + csi2rx->base + CSI2RX_ERROR_IRQS_REG);
> +
> + return IRQ_HANDLED;
> +}
> +
> static const struct csi2rx_fmt *csi2rx_get_fmt_by_code(u32 code)
> {
> unsigned int i;
> @@ -209,12 +277,26 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
> unsigned int i;
> unsigned long lanes_used = 0;
> u32 reg;
> - int ret;
> + int irq, ret;
>
> ret = clk_prepare_enable(csi2rx->p_clk);
> if (ret)
> return ret;
>
> + irq = platform_get_irq_byname_optional(to_platform_device(csi2rx->dev), "error");
Why is this interrupt acquired everytime somebody starts the stream, as
opposed to once at probe-time?
> +
> + if (irq < 0) {
> + dev_warn(csi2rx->dev, "Optional interrupt not defined, proceeding without it\n");
Given this is an optional interrupt, and different SoC vendors may or may not
integerate it, I don't think bothering the end-user with a warning everytime
is best. This could be dev_dbg.
> + } else {
> + csi2rx_configure_err_irq_mask(csi2rx->base);
> + ret = devm_request_irq(csi2rx->dev, irq, csi2rx_irq_handler, 0,
> + "csi2rx-irq", csi2rx);
> + if (ret) {
> + dev_err(csi2rx->dev, "Unable to request interrupt: %d\n", ret);
> + return ret;
> + }
> + }
> +
> reset_control_deassert(csi2rx->p_rst);
> csi2rx_reset(csi2rx);
>
> @@ -361,6 +443,21 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx)
> }
> }
>
> +static int csi2rx_log_status(struct v4l2_subdev *sd)
> +{
> + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(sd);
> + unsigned int i;
> +
> + for (i = 0; i < CSI2RX_NUM_EVENTS; i++) {
> + if (csi2rx->events[i])
> + dev_info(csi2rx->dev, "%s events: %d\n",
> + csi2rx_events[i].name,
> + csi2rx->events[i]);
> + }
> +
> + return 0;
> +}
> +
> static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable)
> {
> struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> @@ -466,7 +563,12 @@ static const struct v4l2_subdev_video_ops csi2rx_video_ops = {
> .s_stream = csi2rx_s_stream,
> };
>
> +static const struct v4l2_subdev_core_ops csi2rx_core_ops = {
> + .log_status = csi2rx_log_status,
> +};
> +
> static const struct v4l2_subdev_ops csi2rx_subdev_ops = {
> + .core = &csi2rx_core_ops,
> .video = &csi2rx_video_ops,
> .pad = &csi2rx_pad_ops,
> };
> --
> 2.34.1
>
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