[PATCH v2 4/4] drm/bridge: imx: add driver for HDMI TX Parallel Video Interface

Liu Ying victor.liu at nxp.com
Sat Dec 17 09:27:40 UTC 2022


On Fri, 2022-12-16 at 22:07 +0100, Lucas Stach wrote:
> This IP block is found in the HDMI subsystem of the i.MX8MP SoC. It
> has a
> full timing generator and can switch between different video sources.
> On
> the i.MX8MP however the only supported source is the LCDIF. The block
> just needs to be powered up and told about the polarity of the video
> sync signals to act in bypass mode.
> 
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> Tested-by: Marek Vasut <marex at denx.de>
> ---
>  drivers/gpu/drm/bridge/imx/Kconfig           |   7 +
>  drivers/gpu/drm/bridge/imx/Makefile          |   1 +
>  drivers/gpu/drm/bridge/imx/imx8mp-hdmi-pvi.c | 202
> +++++++++++++++++++
>  3 files changed, 210 insertions(+)
>  create mode 100644 drivers/gpu/drm/bridge/imx/imx8mp-hdmi-pvi.c
> 
> diff --git a/drivers/gpu/drm/bridge/imx/Kconfig
> b/drivers/gpu/drm/bridge/imx/Kconfig
> index d828d8bfd893..e6cc4000bccd 100644
> --- a/drivers/gpu/drm/bridge/imx/Kconfig
> +++ b/drivers/gpu/drm/bridge/imx/Kconfig
> @@ -53,4 +53,11 @@ config DRM_IMX8MP_DW_HDMI_BRIDGE
>  	  Choose this to enable support for the internal HDMI encoder
> found
>  	  on the i.MX8MP SoC.
>  
> +config DRM_IMX8MP_HDMI_PVI

Sort the config names alphabetically.

> +	tristate "i.MX8MP HDMI PVI bridge support"

Add 'Freescale' before 'i.MX8MP' to show prompts in a consistent
fashion.

> +	depends on OF

select DRM_KMS_HELPER

> +	help
> +	  Choose this to enable support for the internal HDMI TX
> Parallel
> +	  Video Interface found on the i.MX8MP SoC.
> +
>  endif # ARCH_MXC || COMPILE_TEST
> diff --git a/drivers/gpu/drm/bridge/imx/Makefile
> b/drivers/gpu/drm/bridge/imx/Makefile
> index 03b0074ae538..b0fd56550dad 100644
> --- a/drivers/gpu/drm/bridge/imx/Makefile
> +++ b/drivers/gpu/drm/bridge/imx/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-
> pixel-link.o
>  obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) += imx8qxp-pxl2dpi.o
>  
>  obj-$(CONFIG_DRM_IMX8MP_DW_HDMI_BRIDGE) += imx8mp-hdmi.o
> +obj-$(CONFIG_DRM_IMX8MP_HDMI_PVI) += imx8mp-hdmi-pvi.o

Sort the config names alphabetically.

> diff --git a/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-pvi.c
> b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-pvi.c
> new file mode 100644
> index 000000000000..30d40c21dabb
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi-pvi.c
> @@ -0,0 +1,202 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright (C) 2022 Pengutronix, Lucas Stach <
> kernel at pengutronix.de>
> + */
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_crtc.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/pm_runtime.h>

Header files in linux/ come before those in drm/.

> +
> +#define HTX_PVI_CTL	0x0

Nitpick: One more tab between the macro and '0x0'.

> +#define  PVI_CTL_OP_VSYNC_POL	BIT(18)
> +#define  PVI_CTL_OP_HSYNC_POL	BIT(17)
> +#define  PVI_CTL_OP_DE_POL	BIT(16)
> +#define  PVI_CTL_INP_VSYNC_POL	BIT(14)
> +#define  PVI_CTL_INP_HSYNC_POL	BIT(13)
> +#define  PVI_CTL_INP_DE_POL	BIT(12)
> +#define  PVI_CTL_INPUT_LCDIF	BIT(2)
> +#define  PVI_CTL_EN		BIT(0)
> +
> +struct imx8mp_hdmi_pvi {
> +	struct drm_bridge	bridge;
> +	struct device		*dev;
> +	struct drm_bridge	*next_bridge;
> +	void __iomem		*regs;
> +};
> +
> +static inline struct imx8mp_hdmi_pvi *
> +to_imx8mp_hdmi_pvi(struct drm_bridge *bridge)
> +{
> +	return container_of(bridge, struct imx8mp_hdmi_pvi, bridge);
> +}
> +
> +static int imx8mp_hdmi_pvi_bridge_attach(struct drm_bridge *bridge,
> +					 enum drm_bridge_attach_flags
> flags)
> +{
> +	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
> +
> +	return drm_bridge_attach(bridge->encoder, pvi->next_bridge,
> +				 bridge, flags);
> +}
> +
> +static void imx8mp_hdmi_pvi_bridge_enable(struct drm_bridge *bridge,
> +					  struct drm_bridge_state
> *bridge_state)
> +{
> +	struct drm_atomic_state *state = bridge_state->base.state;
> +	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
> +	struct drm_connector_state *conn_state;
> +	const struct drm_display_mode *mode;
> +	struct drm_crtc_state *crtc_state;
> +	struct drm_connector *connector;
> +	u32 bus_flags, val;
> +
> +	connector = drm_atomic_get_new_connector_for_encoder(state,
> bridge->encoder);
> +	conn_state = drm_atomic_get_new_connector_state(state,
> connector);
> +	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state-
> >crtc);
> +
> +	if (WARN_ON(pm_runtime_resume_and_get(pvi->dev)))
> +		return;
> +
> +	mode = &crtc_state->adjusted_mode;
> +
> +	val = PVI_CTL_INPUT_LCDIF;
> +
> +	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
> +		val |= PVI_CTL_OP_VSYNC_POL | PVI_CTL_INP_VSYNC_POL;
> +
> +	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
> +		val |= PVI_CTL_OP_HSYNC_POL | PVI_CTL_INP_HSYNC_POL;
> +
> +	if (pvi->next_bridge->timings)
> +		bus_flags = pvi->next_bridge->timings->input_bus_flags;
> +	else if (bridge_state)
> +		bus_flags = bridge_state->input_bus_cfg.flags;
> +
> +	if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
> +		val |= PVI_CTL_OP_DE_POL | PVI_CTL_INP_DE_POL;
 
Downstream kernel driver sets bit20 & bit21 to insert background color
when something wrong happens(maybe, it may mitigate the issue), not
sure if this driver should do the same or not.

> +
> +	writel(val, pvi->regs + HTX_PVI_CTL);
> +	val |= PVI_CTL_EN;
> +	writel(val, pvi->regs + HTX_PVI_CTL);
> +}
> +
> +static void imx8mp_hdmi_pvi_bridge_disable(struct drm_bridge
> *bridge,
> +					   struct drm_bridge_state
> *bridge_state)
> +{
> +	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
> +
> +	writel(0x0, pvi->regs + HTX_PVI_CTL);
> +
> +	pm_runtime_put(pvi->dev);
> +}
> +
> +static u32 *imx8mp_hdmi_pvi_bridge_get_input_bus_fmts(struct
> drm_bridge *bridge,
> +					struct drm_bridge_state
> *bridge_state,
> +					struct drm_crtc_state
> *crtc_state,
> +					struct drm_connector_state
> *conn_state,
> +					u32 output_fmt,
> +					unsigned int *num_input_fmts)

Please fix the checkpatch.pl warning with --strict parameter:
CHECK: Alignment should match open parenthesis
#151: FILE: drivers/gpu/drm/bridge/imx/imx8mp-hdmi-pvi.c:99:
+static u32 *imx8mp_hdmi_pvi_bridge_get_input_bus_fmts(struct
drm_bridge *bridge,
+                                       struct drm_bridge_state
*bridge_state,

> +{
> +	struct imx8mp_hdmi_pvi *pvi = to_imx8mp_hdmi_pvi(bridge);
> +	struct drm_bridge *next_bridge = pvi->next_bridge;
> +	struct drm_bridge_state *next_state;
> +
> +	if (!next_bridge->funcs->atomic_get_input_bus_fmts)
> +		return 0;
> +
> +	next_state = drm_atomic_get_new_bridge_state(crtc_state->state,
> +						     next_bridge);
> +
> +	return next_bridge->funcs-
> >atomic_get_input_bus_fmts(next_bridge,
> +							     next_state
> ,
> +							     crtc_state
> ,
> +							     conn_state
> ,
> +							     output_fmt
> ,
> +							     num_input_
> fmts);
> +}
> +
> +static const struct drm_bridge_funcs imx_hdmi_pvi_bridge_funcs = {
> +	.attach		= imx8mp_hdmi_pvi_bridge_attach,
> +	.atomic_enable	= imx8mp_hdmi_pvi_bridge_enable,
> +	.atomic_disable	= imx8mp_hdmi_pvi_bridge_disable,
> +	.atomic_get_input_bus_fmts =
> imx8mp_hdmi_pvi_bridge_get_input_bus_fmts,
> +	.atomic_duplicate_state =
> drm_atomic_helper_bridge_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> +	.atomic_reset = drm_atomic_helper_bridge_reset,
> +};
> +
> +static int imx8mp_hdmi_pvi_probe(struct platform_device *pdev)
> +{
> +	struct device_node *remote;
> +	struct imx8mp_hdmi_pvi *pvi;
> +
> +	pvi = devm_kzalloc(&pdev->dev, sizeof(*pvi), GFP_KERNEL);
> +	if (!pvi)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, pvi);
> +	pvi->dev = &pdev->dev;
> +
> +	pvi->regs = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(pvi->regs))
> +		return PTR_ERR(pvi->regs);
> +
> +	/* Get the next bridge in the pipeline. */
> +	remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
> +	if (!remote)
> +		return -EINVAL;
> +
> +	pvi->next_bridge = of_drm_find_bridge(remote);
> +	of_node_put(remote);
> +
> +	if (!pvi->next_bridge)
> +		return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
> +				     "could not find next bridge\n");
> +
> +	/* Register the bridge. */
> +	pvi->bridge.funcs = &imx_hdmi_pvi_bridge_funcs;
> +	pvi->bridge.of_node = pdev->dev.of_node;
> +	pvi->bridge.timings = pvi->next_bridge->timings;
> +
> +	drm_bridge_add(&pvi->bridge);
> +
> +	pm_runtime_enable(&pdev->dev);
> +
> +	return 0;
> +}
> +
> +static int imx8mp_hdmi_pvi_remove(struct platform_device *pdev)
> +{
> +	struct imx8mp_hdmi_pvi *pvi = platform_get_drvdata(pdev);
> +
> +	drm_bridge_remove(&pvi->bridge);

Missing the function call for pm_runtime_disable().

> +
> +	return 0;
> +}
> +
> +static const struct of_device_id imx8mp_hdmi_pvi_match[] = {
> +	{
> +		.compatible = "fsl,imx8mp-hdmi-pvi",
> +	}, {
> +		/* sentinel */
> +	},

Nitpick: ',' after the sentinel is not needed since it's the last one.

Regards,
Liu Ying

> +};
> +MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pvi_match);
> +
> +static struct platform_driver imx8mp_hdmi_pvi_driver = {
> +	.probe	= imx8mp_hdmi_pvi_probe,
> +	.remove	= imx8mp_hdmi_pvi_remove,
> +	.driver		= {
> +		.name = "imx-hdmi-pvi",
> +		.of_match_table	= imx8mp_hdmi_pvi_match,
> +	},
> +};
> +module_platform_driver(imx8mp_hdmi_pvi_driver);
> +
> +MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge
> driver");
> +MODULE_LICENSE("GPL");



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