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Message-ID: <20241217174722.GC3784949@gnbcxd0016.gnb.st.com>
Date: Tue, 17 Dec 2024 18:47:22 +0100
From: Alain Volmat <alain.volmat@...s.st.com>
To: Sakari Ailus <sakari.ailus@....fi>
CC: Hugues Fruchet <hugues.fruchet@...s.st.com>,
Mauro Carvalho Chehab
<mchehab@...nel.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre
Torgue <alexandre.torgue@...s.st.com>,
Sakari Ailus
<sakari.ailus@...ux.intel.com>,
Rob Herring <robh@...nel.org>,
Krzysztof
Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Philipp
Zabel <p.zabel@...gutronix.de>,
Hans Verkuil <hverkuil@...all.nl>, <linux-media@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 13/15] media: stm32: dcmipp: add core support for the
stm32mp25
Hi Sakari,
On Sun, Dec 15, 2024 at 12:55:39PM +0000, Sakari Ailus wrote:
> Hi Alain,
>
> On Thu, Dec 12, 2024 at 10:17:37AM +0100, Alain Volmat wrote:
> > The stm32mp25 supports both parallel & csi inputs.
> > An additional clock control is necessary.
> > Skeleton of the subdev structures for the stm32mp25 is added,
> > identical for the time being to the stm32mp13 however more subdeves
> > will be added in further commits.
> >
> > Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
> > ---
> > v4:
> > - correct clock handling within dcmipp_runtime_resume
> > ---
> > .../platform/st/stm32/stm32-dcmipp/dcmipp-core.c | 104 +++++++++++++++++----
> > 1 file changed, 85 insertions(+), 19 deletions(-)
> >
> > diff --git a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
> > index 62dd17e0488d..71acf539e1f3 100644
> > --- a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
> > +++ b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
> > @@ -40,6 +40,7 @@ struct dcmipp_device {
> >
> > /* Hardware resources */
> > void __iomem *regs;
> > + struct clk *mclk;
> > struct clk *kclk;
> >
> > /* The pipeline configuration */
> > @@ -132,6 +133,40 @@ static const struct dcmipp_pipeline_config stm32mp13_pipe_cfg = {
> > .hw_revision = DCMIPP_STM32MP13_VERR
> > };
> >
> > +static const struct dcmipp_ent_config stm32mp25_ent_config[] = {
> > + {
> > + .name = "dcmipp_input",
> > + .init = dcmipp_inp_ent_init,
> > + .release = dcmipp_inp_ent_release,
> > + },
> > + {
> > + .name = "dcmipp_dump_postproc",
> > + .init = dcmipp_byteproc_ent_init,
> > + .release = dcmipp_byteproc_ent_release,
> > + },
> > + {
> > + .name = "dcmipp_dump_capture",
> > + .init = dcmipp_bytecap_ent_init,
> > + .release = dcmipp_bytecap_ent_release,
> > + },
> > +};
> > +
> > +static const struct dcmipp_ent_link stm32mp25_ent_links[] = {
> > + DCMIPP_ENT_LINK(ID_INPUT, 1, ID_DUMP_BYTEPROC, 0,
> > + MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
> > + DCMIPP_ENT_LINK(ID_DUMP_BYTEPROC, 1, ID_DUMP_CAPTURE, 0,
> > + MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
> > +};
> > +
> > +#define DCMIPP_STM32MP25_VERR 0x30
> > +static const struct dcmipp_pipeline_config stm32mp25_pipe_cfg = {
> > + .ents = stm32mp25_ent_config,
> > + .num_ents = ARRAY_SIZE(stm32mp25_ent_config),
> > + .links = stm32mp25_ent_links,
> > + .num_links = ARRAY_SIZE(stm32mp25_ent_links),
> > + .hw_revision = DCMIPP_STM32MP25_VERR
> > +};
> > +
> > #define LINK_FLAG_TO_STR(f) ((f) == 0 ? "" :\
> > (f) == MEDIA_LNK_FL_ENABLED ? "ENABLED" :\
> > (f) == MEDIA_LNK_FL_IMMUTABLE ? "IMMUTABLE" :\
> > @@ -212,6 +247,7 @@ static int dcmipp_create_subdevs(struct dcmipp_device *dcmipp)
> >
> > static const struct of_device_id dcmipp_of_match[] = {
> > { .compatible = "st,stm32mp13-dcmipp", .data = &stm32mp13_pipe_cfg },
> > + { .compatible = "st,stm32mp25-dcmipp", .data = &stm32mp25_pipe_cfg },
> > { /* end node */ },
> > };
> > MODULE_DEVICE_TABLE(of, dcmipp_of_match);
> > @@ -261,13 +297,22 @@ static int dcmipp_graph_notify_bound(struct v4l2_async_notifier *notifier,
> > {
> > struct dcmipp_device *dcmipp = notifier_to_dcmipp(notifier);
> > unsigned int ret;
> > - int src_pad;
> > + int src_pad, i;
>
> unsigned int?
Done
>
> > struct dcmipp_ent_device *sink;
> > - struct v4l2_fwnode_endpoint vep = { .bus_type = V4L2_MBUS_PARALLEL };
> > + struct v4l2_fwnode_endpoint vep = { 0 };
> > struct fwnode_handle *ep;
> > + enum v4l2_mbus_type supported_types[] = {
> > + V4L2_MBUS_PARALLEL, V4L2_MBUS_BT656, V4L2_MBUS_CSI2_DPHY
> > + };
> > + int supported_types_nb = ARRAY_SIZE(supported_types);
> >
> > dev_dbg(dcmipp->dev, "Subdev \"%s\" bound\n", subdev->name);
> >
> > + /* Only MP25 supports CSI input */
> > + if (!of_device_is_compatible(dcmipp->dev->of_node,
> > + "st,stm32mp25-dcmipp"))
>
> This would be much cleaner with match data. You seem to already be using it
> for other purposes.
Added a new boolean within the match structure to indicate if csi is
supported or not.
>
> > + supported_types_nb--;
> > +
> > /*
> > * Link this sub-device to DCMIPP, it could be
> > * a parallel camera sensor or a CSI-2 to parallel bridge
> > @@ -284,21 +329,23 @@ static int dcmipp_graph_notify_bound(struct v4l2_async_notifier *notifier,
> > return -ENODEV;
> > }
> >
> > - /* Check for parallel bus-type first, then bt656 */
> > - ret = v4l2_fwnode_endpoint_parse(ep, &vep);
> > - if (ret) {
> > - vep.bus_type = V4L2_MBUS_BT656;
> > + /* Check for supported MBUS type */
> > + for (i = 0; i < supported_types_nb; i++) {
> > + vep.bus_type = supported_types[i];
> > ret = v4l2_fwnode_endpoint_parse(ep, &vep);
> > - if (ret) {
> > - dev_err(dcmipp->dev, "Could not parse the endpoint\n");
> > - fwnode_handle_put(ep);
> > - return ret;
> > - }
> > + if (!ret)
> > + break;
> > }
> >
> > fwnode_handle_put(ep);
> >
> > - if (vep.bus.parallel.bus_width == 0) {
> > + if (ret) {
> > + dev_err(dcmipp->dev, "Could not parse the endpoint\n");
> > + return ret;
> > + }
> > +
> > + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY &&
> > + vep.bus.parallel.bus_width == 0) {
> > dev_err(dcmipp->dev, "Invalid parallel interface bus-width\n");
> > return -ENODEV;
> > }
> > @@ -311,11 +358,13 @@ static int dcmipp_graph_notify_bound(struct v4l2_async_notifier *notifier,
> > return -ENODEV;
> > }
> >
> > - /* Parallel input device detected, connect it to parallel subdev */
> > + /* Connect input device to the dcmipp_input subdev */
> > sink = dcmipp->entity[ID_INPUT];
> > - sink->bus.flags = vep.bus.parallel.flags;
> > - sink->bus.bus_width = vep.bus.parallel.bus_width;
> > - sink->bus.data_shift = vep.bus.parallel.data_shift;
> > + if (vep.bus_type != V4L2_MBUS_CSI2_DPHY) {
> > + sink->bus.flags = vep.bus.parallel.flags;
> > + sink->bus.bus_width = vep.bus.parallel.bus_width;
> > + sink->bus.data_shift = vep.bus.parallel.data_shift;
> > + }
> > sink->bus_type = vep.bus_type;
> > ret = media_create_pad_link(&subdev->entity, src_pad, sink->ent, 0,
> > MEDIA_LNK_FL_IMMUTABLE |
> > @@ -414,7 +463,7 @@ static int dcmipp_graph_init(struct dcmipp_device *dcmipp)
> > static int dcmipp_probe(struct platform_device *pdev)
> > {
> > struct dcmipp_device *dcmipp;
> > - struct clk *kclk;
> > + struct clk *kclk, *mclk;
> > const struct dcmipp_pipeline_config *pipe_cfg;
> > struct reset_control *rstc;
> > int irq;
> > @@ -474,12 +523,20 @@ static int dcmipp_probe(struct platform_device *pdev)
> > return ret;
> > }
> >
> > - kclk = devm_clk_get(&pdev->dev, NULL);
> > + kclk = devm_clk_get(&pdev->dev, "kclk");
> > if (IS_ERR(kclk))
> > return dev_err_probe(&pdev->dev, PTR_ERR(kclk),
> > "Unable to get kclk\n");
> > dcmipp->kclk = kclk;
> >
> > + if (!of_device_is_compatible(pdev->dev.of_node, "st,stm32mp13-dcmipp")) {
>
> Same here.
Done as well via match structure.
>
> > + mclk = devm_clk_get(&pdev->dev, "mclk");
> > + if (IS_ERR(mclk))
> > + return dev_err_probe(&pdev->dev, PTR_ERR(mclk),
> > + "Unable to get mclk\n");
> > + dcmipp->mclk = mclk;
> > + }
> > +
> > dcmipp->entity = devm_kcalloc(&pdev->dev, dcmipp->pipe_cfg->num_ents,
> > sizeof(*dcmipp->entity), GFP_KERNEL);
> > if (!dcmipp->entity)
> > @@ -542,6 +599,7 @@ static int dcmipp_runtime_suspend(struct device *dev)
> > struct dcmipp_device *dcmipp = dev_get_drvdata(dev);
> >
> > clk_disable_unprepare(dcmipp->kclk);
> > + clk_disable_unprepare(dcmipp->mclk);
> >
> > return 0;
> > }
> > @@ -551,9 +609,17 @@ static int dcmipp_runtime_resume(struct device *dev)
> > struct dcmipp_device *dcmipp = dev_get_drvdata(dev);
> > int ret;
> >
> > + ret = clk_prepare_enable(dcmipp->mclk);
> > + if (ret) {
> > + dev_err(dev, "%s: Failed to prepare_enable mclk\n", __func__);
> > + return ret;
> > + }
> > +
> > ret = clk_prepare_enable(dcmipp->kclk);
> > - if (ret)
> > + if (ret) {
> > + clk_disable_unprepare(dcmipp->mclk);
> > dev_err(dev, "%s: Failed to prepare_enable kclk\n", __func__);
> > + }
> >
> > return ret;
> > }
> >
> >
>
> --
> Kind regards,
>
> Sakari Ailus
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