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Message-ID: <20230312133921.GK2545@pendragon.ideasonboard.com>
Date: Sun, 12 Mar 2023 15:39:21 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Martin Kepplinger <martin.kepplinger@...i.sm>
Cc: slongerbeam@...il.com, p.zabel@...gutronix.de, mchehab@...nel.org,
gregkh@...uxfoundation.org, shawnguo@...nel.org,
kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
kernel@...i.sm
Subject: Re: [PATCH v2 1/2] media: imx: imx8mq-mipi-csi2: Use V4L2 subdev
active state
On Sun, Mar 12, 2023 at 03:31:23PM +0200, Laurent Pinchart wrote:
> Hi Martin,
>
> Thank you for the patch.
>
> On Tue, Mar 07, 2023 at 04:00:46PM +0100, Martin Kepplinger wrote:
> > Simplify the driver by using the V4L2 subdev active state API to store
> > the active format.
> >
> > Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
> > ---
> > drivers/staging/media/imx/imx8mq-mipi-csi2.c | 118 ++++++++-----------
> > 1 file changed, 46 insertions(+), 72 deletions(-)
> >
> > diff --git a/drivers/staging/media/imx/imx8mq-mipi-csi2.c b/drivers/staging/media/imx/imx8mq-mipi-csi2.c
> > index c0d0bf770096..1aa8622a3bae 100644
> > --- a/drivers/staging/media/imx/imx8mq-mipi-csi2.c
> > +++ b/drivers/staging/media/imx/imx8mq-mipi-csi2.c
> > @@ -119,9 +119,7 @@ struct csi_state {
> >
> > struct v4l2_mbus_config_mipi_csi2 bus;
> >
> > - struct mutex lock; /* Protect csi2_fmt, format_mbus, state, hs_settle */
> > - const struct csi2_pix_format *csi2_fmt;
> > - struct v4l2_mbus_framefmt format_mbus[MIPI_CSI2_PADS_NUM];
> > + struct mutex lock; /* Protect state and hs_settle */
> > u32 state;
> > u32 hs_settle;
> >
> > @@ -322,16 +320,23 @@ static int imx8mq_mipi_csi_clk_get(struct csi_state *state)
> > return devm_clk_bulk_get(state->dev, CSI2_NUM_CLKS, state->clks);
> > }
> >
> > -static int imx8mq_mipi_csi_calc_hs_settle(struct csi_state *state)
> > +static int imx8mq_mipi_csi_calc_hs_settle(struct csi_state *state,
> > + struct v4l2_subdev_state *sd_state)
> > {
> > s64 link_freq;
> > u32 lane_rate;
> > unsigned long esc_clk_rate;
> > u32 min_ths_settle, max_ths_settle, ths_settle_ns, esc_clk_period_ns;
> > + const struct v4l2_mbus_framefmt *fmt;
> > + const struct csi2_pix_format *csi2_fmt;
> >
> > /* Calculate the line rate from the pixel rate. */
> > +
> > + fmt = v4l2_subdev_get_pad_format(&state->sd, sd_state, MIPI_CSI2_PAD_SINK);
> > + csi2_fmt = find_csi2_format(fmt->code);
> > +
> > link_freq = v4l2_get_link_freq(state->src_sd->ctrl_handler,
> > - state->csi2_fmt->width,
> > + csi2_fmt->width,
> > state->bus.num_data_lanes * 2);
> > if (link_freq < 0) {
> > dev_err(state->dev, "Unable to obtain link frequency: %d\n",
> > @@ -380,7 +385,8 @@ static int imx8mq_mipi_csi_calc_hs_settle(struct csi_state *state)
> > return 0;
> > }
> >
> > -static int imx8mq_mipi_csi_start_stream(struct csi_state *state)
> > +static int imx8mq_mipi_csi_start_stream(struct csi_state *state,
> > + struct v4l2_subdev_state *sd_state)
> > {
> > int ret;
> >
> > @@ -389,7 +395,7 @@ static int imx8mq_mipi_csi_start_stream(struct csi_state *state)
> > return ret;
> >
> > imx8mq_mipi_csi_set_params(state);
> > - ret = imx8mq_mipi_csi_calc_hs_settle(state);
> > + ret = imx8mq_mipi_csi_calc_hs_settle(state, sd_state);
> > if (ret)
> > return ret;
> >
> > @@ -415,6 +421,7 @@ static struct csi_state *mipi_sd_to_csi2_state(struct v4l2_subdev *sdev)
> > static int imx8mq_mipi_csi_s_stream(struct v4l2_subdev *sd, int enable)
> > {
> > struct csi_state *state = mipi_sd_to_csi2_state(sd);
> > + struct v4l2_subdev_state *sd_state;
> > int ret = 0;
> >
> > if (enable) {
> > @@ -431,7 +438,9 @@ static int imx8mq_mipi_csi_s_stream(struct v4l2_subdev *sd, int enable)
> > goto unlock;
> > }
> >
> > - ret = imx8mq_mipi_csi_start_stream(state);
> > + sd_state = v4l2_subdev_lock_and_get_active_state(sd);
> > +
> > + ret = imx8mq_mipi_csi_start_stream(state, sd_state);
> > if (ret < 0)
> > goto unlock;
>
> You're leaving the state locked here. I would write
>
> sd_state = v4l2_subdev_lock_and_get_active_state(sd);
> ret = imx8mq_mipi_csi_start_stream(state, sd_state);
> v4l2_subdev_unlock_state(sd_state);
>
> if (ret < 0)
> goto unlock;
>
> and drop the v4l2_subdev_unlock_state() call below. Apart from that,
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
If you're fine with this change, there's no need so submit a v3, I'll
handle this locally.
> >
> > @@ -440,6 +449,8 @@ static int imx8mq_mipi_csi_s_stream(struct v4l2_subdev *sd, int enable)
> > goto unlock;
> >
> > state->state |= ST_STREAMING;
> > +
> > + v4l2_subdev_unlock_state(sd_state);
> > } else {
> > v4l2_subdev_call(state->src_sd, video, s_stream, 0);
> > imx8mq_mipi_csi_stop_stream(state);
> > @@ -455,29 +466,14 @@ static int imx8mq_mipi_csi_s_stream(struct v4l2_subdev *sd, int enable)
> > return ret;
> > }
> >
> > -static struct v4l2_mbus_framefmt *
> > -imx8mq_mipi_csi_get_format(struct csi_state *state,
> > - struct v4l2_subdev_state *sd_state,
> > - enum v4l2_subdev_format_whence which,
> > - unsigned int pad)
> > -{
> > - if (which == V4L2_SUBDEV_FORMAT_TRY)
> > - return v4l2_subdev_get_try_format(&state->sd, sd_state, pad);
> > -
> > - return &state->format_mbus[pad];
> > -}
> > -
> > static int imx8mq_mipi_csi_init_cfg(struct v4l2_subdev *sd,
> > struct v4l2_subdev_state *sd_state)
> > {
> > - struct csi_state *state = mipi_sd_to_csi2_state(sd);
> > struct v4l2_mbus_framefmt *fmt_sink;
> > struct v4l2_mbus_framefmt *fmt_source;
> > - enum v4l2_subdev_format_whence which;
> >
> > - which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
> > - fmt_sink = imx8mq_mipi_csi_get_format(state, sd_state, which,
> > - MIPI_CSI2_PAD_SINK);
> > + fmt_sink = v4l2_subdev_get_pad_format(sd, sd_state, MIPI_CSI2_PAD_SINK);
> > + fmt_source = v4l2_subdev_get_pad_format(sd, sd_state, MIPI_CSI2_PAD_SOURCE);
> >
> > fmt_sink->code = MEDIA_BUS_FMT_SGBRG10_1X10;
> > fmt_sink->width = MIPI_CSI2_DEF_PIX_WIDTH;
> > @@ -491,38 +487,15 @@ static int imx8mq_mipi_csi_init_cfg(struct v4l2_subdev *sd,
> > V4L2_MAP_QUANTIZATION_DEFAULT(false, fmt_sink->colorspace,
> > fmt_sink->ycbcr_enc);
> >
> > - fmt_source = imx8mq_mipi_csi_get_format(state, sd_state, which,
> > - MIPI_CSI2_PAD_SOURCE);
> > *fmt_source = *fmt_sink;
> >
> > return 0;
> > }
> >
> > -static int imx8mq_mipi_csi_get_fmt(struct v4l2_subdev *sd,
> > - struct v4l2_subdev_state *sd_state,
> > - struct v4l2_subdev_format *sdformat)
> > -{
> > - struct csi_state *state = mipi_sd_to_csi2_state(sd);
> > - struct v4l2_mbus_framefmt *fmt;
> > -
> > - fmt = imx8mq_mipi_csi_get_format(state, sd_state, sdformat->which,
> > - sdformat->pad);
> > -
> > - mutex_lock(&state->lock);
> > -
> > - sdformat->format = *fmt;
> > -
> > - mutex_unlock(&state->lock);
> > -
> > - return 0;
> > -}
> > -
> > static int imx8mq_mipi_csi_enum_mbus_code(struct v4l2_subdev *sd,
> > struct v4l2_subdev_state *sd_state,
> > struct v4l2_subdev_mbus_code_enum *code)
> > {
> > - struct csi_state *state = mipi_sd_to_csi2_state(sd);
> > -
> > /*
> > * We can't transcode in any way, the source format is identical
> > * to the sink format.
> > @@ -533,8 +506,7 @@ static int imx8mq_mipi_csi_enum_mbus_code(struct v4l2_subdev *sd,
> > if (code->index > 0)
> > return -EINVAL;
> >
> > - fmt = imx8mq_mipi_csi_get_format(state, sd_state, code->which,
> > - code->pad);
> > + fmt = v4l2_subdev_get_pad_format(sd, sd_state, code->pad);
> > code->code = fmt->code;
> > return 0;
> > }
> > @@ -554,8 +526,7 @@ static int imx8mq_mipi_csi_set_fmt(struct v4l2_subdev *sd,
> > struct v4l2_subdev_state *sd_state,
> > struct v4l2_subdev_format *sdformat)
> > {
> > - struct csi_state *state = mipi_sd_to_csi2_state(sd);
> > - struct csi2_pix_format const *csi2_fmt;
> > + const struct csi2_pix_format *csi2_fmt;
> > struct v4l2_mbus_framefmt *fmt;
> >
> > /*
> > @@ -563,7 +534,7 @@ static int imx8mq_mipi_csi_set_fmt(struct v4l2_subdev *sd,
> > * modified.
> > */
> > if (sdformat->pad == MIPI_CSI2_PAD_SOURCE)
> > - return imx8mq_mipi_csi_get_fmt(sd, sd_state, sdformat);
> > + return v4l2_subdev_get_fmt(sd, sd_state, sdformat);
> >
> > if (sdformat->pad != MIPI_CSI2_PAD_SINK)
> > return -EINVAL;
> > @@ -572,10 +543,7 @@ static int imx8mq_mipi_csi_set_fmt(struct v4l2_subdev *sd,
> > if (!csi2_fmt)
> > csi2_fmt = &imx8mq_mipi_csi_formats[0];
> >
> > - fmt = imx8mq_mipi_csi_get_format(state, sd_state, sdformat->which,
> > - sdformat->pad);
> > -
> > - mutex_lock(&state->lock);
> > + fmt = v4l2_subdev_get_pad_format(sd, sd_state, sdformat->pad);
> >
> > fmt->code = csi2_fmt->code;
> > fmt->width = sdformat->format.width;
> > @@ -584,16 +552,9 @@ static int imx8mq_mipi_csi_set_fmt(struct v4l2_subdev *sd,
> > sdformat->format = *fmt;
> >
> > /* Propagate the format from sink to source. */
> > - fmt = imx8mq_mipi_csi_get_format(state, sd_state, sdformat->which,
> > - MIPI_CSI2_PAD_SOURCE);
> > + fmt = v4l2_subdev_get_pad_format(sd, sd_state, MIPI_CSI2_PAD_SOURCE);
> > *fmt = sdformat->format;
> >
> > - /* Store the CSI2 format descriptor for active formats. */
> > - if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> > - state->csi2_fmt = csi2_fmt;
> > -
> > - mutex_unlock(&state->lock);
> > -
> > return 0;
> > }
> >
> > @@ -604,7 +565,7 @@ static const struct v4l2_subdev_video_ops imx8mq_mipi_csi_video_ops = {
> > static const struct v4l2_subdev_pad_ops imx8mq_mipi_csi_pad_ops = {
> > .init_cfg = imx8mq_mipi_csi_init_cfg,
> > .enum_mbus_code = imx8mq_mipi_csi_enum_mbus_code,
> > - .get_fmt = imx8mq_mipi_csi_get_fmt,
> > + .get_fmt = v4l2_subdev_get_fmt,
> > .set_fmt = imx8mq_mipi_csi_set_fmt,
> > };
> >
> > @@ -732,6 +693,7 @@ static int imx8mq_mipi_csi_pm_resume(struct device *dev)
> > {
> > struct v4l2_subdev *sd = dev_get_drvdata(dev);
> > struct csi_state *state = mipi_sd_to_csi2_state(sd);
> > + struct v4l2_subdev_state *sd_state;
> > int ret = 0;
> >
> > mutex_lock(&state->lock);
> > @@ -741,7 +703,9 @@ static int imx8mq_mipi_csi_pm_resume(struct device *dev)
> > ret = imx8mq_mipi_csi_clk_enable(state);
> > }
> > if (state->state & ST_STREAMING) {
> > - ret = imx8mq_mipi_csi_start_stream(state);
> > + sd_state = v4l2_subdev_lock_and_get_active_state(sd);
> > + ret = imx8mq_mipi_csi_start_stream(state, sd_state);
> > + v4l2_subdev_unlock_state(sd_state);
> > if (ret)
> > goto unlock;
> > }
> > @@ -821,6 +785,7 @@ static const struct dev_pm_ops imx8mq_mipi_csi_pm_ops = {
> > static int imx8mq_mipi_csi_subdev_init(struct csi_state *state)
> > {
> > struct v4l2_subdev *sd = &state->sd;
> > + int ret;
> >
> > v4l2_subdev_init(sd, &imx8mq_mipi_csi_subdev_ops);
> > sd->owner = THIS_MODULE;
> > @@ -834,15 +799,22 @@ static int imx8mq_mipi_csi_subdev_init(struct csi_state *state)
> >
> > sd->dev = state->dev;
> >
> > - state->csi2_fmt = &imx8mq_mipi_csi_formats[0];
> > - imx8mq_mipi_csi_init_cfg(sd, NULL);
> > -
> > state->pads[MIPI_CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK
> > | MEDIA_PAD_FL_MUST_CONNECT;
> > state->pads[MIPI_CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE
> > | MEDIA_PAD_FL_MUST_CONNECT;
> > - return media_entity_pads_init(&sd->entity, MIPI_CSI2_PADS_NUM,
> > - state->pads);
> > + ret = media_entity_pads_init(&sd->entity, MIPI_CSI2_PADS_NUM,
> > + state->pads);
> > + if (ret)
> > + return ret;
> > +
> > + ret = v4l2_subdev_init_finalize(sd);
> > + if (ret) {
> > + media_entity_cleanup(&sd->entity);
> > + return ret;
> > + }
> > +
> > + return 0;
> > }
> >
> > static void imx8mq_mipi_csi_release_icc(struct platform_device *pdev)
> > @@ -968,6 +940,7 @@ static int imx8mq_mipi_csi_probe(struct platform_device *pdev)
> > imx8mq_mipi_csi_runtime_suspend(&pdev->dev);
> >
> > media_entity_cleanup(&state->sd.entity);
> > + v4l2_subdev_cleanup(&state->sd);
> > v4l2_async_nf_unregister(&state->notifier);
> > v4l2_async_nf_cleanup(&state->notifier);
> > v4l2_async_unregister_subdev(&state->sd);
> > @@ -991,6 +964,7 @@ static int imx8mq_mipi_csi_remove(struct platform_device *pdev)
> > pm_runtime_disable(&pdev->dev);
> > imx8mq_mipi_csi_runtime_suspend(&pdev->dev);
> > media_entity_cleanup(&state->sd.entity);
> > + v4l2_subdev_cleanup(&state->sd);
> > mutex_destroy(&state->lock);
> > pm_runtime_set_suspended(&pdev->dev);
> > imx8mq_mipi_csi_release_icc(pdev);
--
Regards,
Laurent Pinchart
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