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Message-ID: <CAG3jFyufawQ=0UNgfbTgzkbqCYQ7LS-BMq7mXruX470iYBXMOw@mail.gmail.com>
Date: Fri, 26 Feb 2021 14:07:49 +0100
From: Robert Foss <robert.foss@...aro.org>
To: Liu Ying <victor.liu@....com>
Cc: dri-devel <dri-devel@...ts.freedesktop.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-media <linux-media@...r.kernel.org>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Rob Herring <robh+dt@...nel.org>, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de,
Fabio Estevam <festevam@...il.com>, linux-imx@....com,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Andrzej Hajda <a.hajda@...sung.com>,
Neil Armstrong <narmstrong@...libre.com>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...l.net>, kishon@...com,
Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v4 05/14] drm/bridge: imx: Add i.MX8qm/qxp pixel combiner support
Hey Liu,
With the below nit straightened out, feel free to add my r-b.
Reviewed-by: Robert Foss <robert.foss@...aro.org>
On Thu, 18 Feb 2021 at 04:58, Liu Ying <victor.liu@....com> wrote:
>
> This patch adds a drm bridge driver for i.MX8qm/qxp pixel combiner.
> The pixel combiner takes two output streams from a single display
> controller and manipulates the two streams to support a number
> of modes(bypass, pixel combine, YUV444 to YUV422, split_RGB) configured
> as either one screen, two screens, or virtual screens. The pixel
> combiner is also responsible for generating some of the control signals
> for the pixel link output channel. For now, the driver only supports
> the bypass mode.
>
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
> v3->v4:
> * No change.
>
> v2->v3:
> * No change.
>
> v1->v2:
> * No change.
>
> drivers/gpu/drm/bridge/Kconfig | 2 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/imx/Kconfig | 8 +
> drivers/gpu/drm/bridge/imx/Makefile | 1 +
> .../gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c | 452 +++++++++++++++++++++
> 5 files changed, 464 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/imx/Kconfig
> create mode 100644 drivers/gpu/drm/bridge/imx/Makefile
> create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index e4110d6c..84944e0 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -256,6 +256,8 @@ source "drivers/gpu/drm/bridge/adv7511/Kconfig"
>
> source "drivers/gpu/drm/bridge/cadence/Kconfig"
>
> +source "drivers/gpu/drm/bridge/imx/Kconfig"
> +
> source "drivers/gpu/drm/bridge/synopsys/Kconfig"
>
> endmenu
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 86e7acc..bc80cae 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -27,4 +27,5 @@ obj-$(CONFIG_DRM_NWL_MIPI_DSI) += nwl-dsi.o
>
> obj-y += analogix/
> obj-y += cadence/
> +obj-y += imx/
> obj-y += synopsys/
> diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
> new file mode 100644
> index 00000000..f1c91b6
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/imx/Kconfig
> @@ -0,0 +1,8 @@
> +config DRM_IMX8QXP_PIXEL_COMBINER
> + tristate "Freescale i.MX8QM/QXP pixel combiner"
> + depends on OF
> + depends on COMMON_CLK
> + select DRM_KMS_HELPER
> + help
> + Choose this to enable pixel combiner found in
> + Freescale i.MX8qm/qxp processors.
> diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile
> new file mode 100644
> index 00000000..7d7c8d6
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/imx/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) += imx8qxp-pixel-combiner.o
> diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
> new file mode 100644
> index 00000000..cd5b1be
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pixel-combiner.c
> @@ -0,0 +1,452 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright 2020 NXP
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +
> +#include <drm/drm_atomic_state_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_print.h>
> +
> +#define PC_CTRL_REG 0x0
> +#define PC_COMBINE_ENABLE BIT(0)
> +#define PC_DISP_BYPASS(n) BIT(1 + 21 * (n))
> +#define PC_DISP_HSYNC_POLARITY(n) BIT(2 + 11 * (n))
> +#define PC_DISP_HSYNC_POLARITY_POS(n) DISP_HSYNC_POLARITY(n)
> +#define PC_DISP_VSYNC_POLARITY(n) BIT(3 + 11 * (n))
> +#define PC_DISP_VSYNC_POLARITY_POS(n) DISP_VSYNC_POLARITY(n)
> +#define PC_DISP_DVALID_POLARITY(n) BIT(4 + 11 * (n))
> +#define PC_DISP_DVALID_POLARITY_POS(n) DISP_DVALID_POLARITY(n)
> +#define PC_VSYNC_MASK_ENABLE BIT(5)
> +#define PC_SKIP_MODE BIT(6)
> +#define PC_SKIP_NUMBER_MASK GENMASK(12, 7)
> +#define PC_SKIP_NUMBER(n) FIELD_PREP(PC_SKIP_NUMBER_MASK, (n))
> +#define PC_DISP0_PIX_DATA_FORMAT_MASK GENMASK(18, 16)
> +#define PC_DISP0_PIX_DATA_FORMAT(fmt) \
> + FIELD_PREP(PC_DISP0_PIX_DATA_FORMAT_MASK, (fmt))
> +#define PC_DISP1_PIX_DATA_FORMAT_MASK GENMASK(21, 19)
> +#define PC_DISP1_PIX_DATA_FORMAT(fmt) \
> + FIELD_PREP(PC_DISP1_PIX_DATA_FORMAT_MASK, (fmt))
> +
> +#define PC_BUF_PARA_REG 0x10
This register is unused, keeping it in here to avoid future headaches
seems like a good idea.
> +#define PC_BUF_ACTIVE_DEPTH_MASK GENMASK(10, 0)
> +#define PC_BUF_ACTIVE_DEPTH(n) FIELD_PREP(PC_BUF_ACTIVE_DEPTH_MASK, (n))
> +
> +#define PC_SW_RESET_REG 0x20
> +#define PC_SW_RESET_N BIT(0)
> +#define PC_DISP_SW_RESET_N(n) BIT(1 + (n))
> +#define PC_FULL_RESET_N (PC_SW_RESET_N | \
> + PC_DISP_SW_RESET_N(0) | \
> + PC_DISP_SW_RESET_N(1))
> +
> +#define PC_REG_SET 0x4
> +#define PC_REG_CLR 0x8
> +
> +#define DRIVER_NAME "imx8qxp-pixel-combiner"
> +
> +enum imx8qxp_pc_pix_data_format {
> + RGB,
> + YUV444,
> + YUV422,
> + SPLIT_RGB,
YUV444, YUV422 & SPLIT_RGB are also unused, but if their values are
compatible with the PC_DISP0_PIX_DATA_FORMAT macro I think keeping
them around for future reference is a good idea.
> +};
> +
> +struct imx8qxp_pc_channel {
> + struct drm_bridge bridge;
> + struct drm_bridge *next_bridge;
> + struct imx8qxp_pc *pc;
> + unsigned int stream_id;
> + bool is_available;
> +};
> +
> +struct imx8qxp_pc {
> + struct device *dev;
> + struct imx8qxp_pc_channel ch[2];
> + struct clk *clk_apb;
> + void __iomem *base;
> +};
> +
> +static inline u32 imx8qxp_pc_read(struct imx8qxp_pc *pc, unsigned int offset)
> +{
> + return readl(pc->base + offset);
> +}
> +
> +static inline void
> +imx8qxp_pc_write(struct imx8qxp_pc *pc, unsigned int offset, u32 value)
> +{
> + writel(value, pc->base + offset);
> +}
> +
> +static inline void
> +imx8qxp_pc_write_set(struct imx8qxp_pc *pc, unsigned int offset, u32 value)
> +{
> + imx8qxp_pc_write(pc, offset + PC_REG_SET, value);
> +}
> +
> +static inline void
> +imx8qxp_pc_write_clr(struct imx8qxp_pc *pc, unsigned int offset, u32 value)
> +{
> + imx8qxp_pc_write(pc, offset + PC_REG_CLR, value);
> +}
> +
> +static enum drm_mode_status
> +imx8qxp_pc_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_info *info,
> + const struct drm_display_mode *mode)
> +{
> + if (mode->hdisplay > 2560)
> + return MODE_BAD_HVALUE;
> +
> + return MODE_OK;
> +}
> +
> +static int imx8qxp_pc_bridge_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct imx8qxp_pc_channel *ch = bridge->driver_private;
> + struct imx8qxp_pc *pc = ch->pc;
> +
> + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> + DRM_DEV_ERROR(pc->dev,
> + "do not support creating a drm_connector\n");
> + return -EINVAL;
> + }
> +
> + if (!bridge->encoder) {
> + DRM_DEV_ERROR(pc->dev, "missing encoder\n");
> + return -ENODEV;
> + }
> +
> + return drm_bridge_attach(bridge->encoder,
> + ch->next_bridge, bridge,
> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> +}
> +
> +static void
> +imx8qxp_pc_bridge_mode_set(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode)
> +{
> + struct imx8qxp_pc_channel *ch = bridge->driver_private;
> + struct imx8qxp_pc *pc = ch->pc;
> + u32 val;
> + int ret;
> +
> + ret = pm_runtime_get_sync(pc->dev);
> + if (ret < 0)
> + DRM_DEV_ERROR(pc->dev,
> + "failed to get runtime PM sync: %d\n", ret);
> +
> + ret = clk_prepare_enable(pc->clk_apb);
> + if (ret)
> + DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n",
> + __func__, ret);
> +
> + /* HSYNC to pixel link is active low. */
> + imx8qxp_pc_write_clr(pc, PC_CTRL_REG,
> + PC_DISP_HSYNC_POLARITY(ch->stream_id));
> +
> + /* VSYNC to pixel link is active low. */
> + imx8qxp_pc_write_clr(pc, PC_CTRL_REG,
> + PC_DISP_VSYNC_POLARITY(ch->stream_id));
> +
> + /* Data enable to pixel link is active high. */
> + imx8qxp_pc_write_set(pc, PC_CTRL_REG,
> + PC_DISP_DVALID_POLARITY(ch->stream_id));
> +
> + /* Mask the first frame output which may be incomplete. */
> + imx8qxp_pc_write_set(pc, PC_CTRL_REG, PC_VSYNC_MASK_ENABLE);
> +
> + /* Only support RGB currently. */
> + val = imx8qxp_pc_read(pc, PC_CTRL_REG);
> + if (ch->stream_id == 0) {
> + val &= ~PC_DISP0_PIX_DATA_FORMAT_MASK;
> + val |= PC_DISP0_PIX_DATA_FORMAT(RGB);
> + } else {
> + val &= ~PC_DISP1_PIX_DATA_FORMAT_MASK;
> + val |= PC_DISP1_PIX_DATA_FORMAT(RGB);
> + }
> + imx8qxp_pc_write(pc, PC_CTRL_REG, val);
> +
> + /* Only support bypass mode currently. */
> + imx8qxp_pc_write_set(pc, PC_CTRL_REG, PC_DISP_BYPASS(ch->stream_id));
> +
> + clk_disable_unprepare(pc->clk_apb);
> +}
> +
> +static void imx8qxp_pc_bridge_atomic_disable(struct drm_bridge *bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct imx8qxp_pc_channel *ch = bridge->driver_private;
> + struct imx8qxp_pc *pc = ch->pc;
> + int ret;
> +
> + ret = pm_runtime_put(pc->dev);
> + if (ret < 0)
> + DRM_DEV_ERROR(pc->dev, "failed to put runtime PM: %d\n", ret);
> +}
> +
> +static const u32 imx8qxp_pc_bus_output_fmts[] = {
> + MEDIA_BUS_FMT_RGB888_1X36_CPADLO,
> + MEDIA_BUS_FMT_RGB666_1X36_CPADLO,
> +};
> +
> +static bool imx8qxp_pc_bus_output_fmt_supported(u32 fmt)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(imx8qxp_pc_bus_output_fmts); i++) {
> + if (imx8qxp_pc_bus_output_fmts[i] == fmt)
> + return true;
> + }
> +
> + return false;
> +}
> +
> +static u32 *
> +imx8qxp_pc_bridge_atomic_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)
> +{
> + u32 *input_fmts;
> +
> + if (!imx8qxp_pc_bus_output_fmt_supported(output_fmt))
> + return NULL;
> +
> + *num_input_fmts = 1;
> +
> + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
> + if (!input_fmts)
> + return NULL;
> +
> + switch (output_fmt) {
> + case MEDIA_BUS_FMT_RGB888_1X36_CPADLO:
> + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X30_CPADLO;
> + break;
> + case MEDIA_BUS_FMT_RGB666_1X36_CPADLO:
> + input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X30_CPADLO;
> + break;
> + default:
> + kfree(input_fmts);
> + input_fmts = NULL;
> + break;
> + }
> +
> + return input_fmts;
> +}
> +
> +static u32 *
> +imx8qxp_pc_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state,
> + unsigned int *num_output_fmts)
> +{
> + *num_output_fmts = ARRAY_SIZE(imx8qxp_pc_bus_output_fmts);
> + return kmemdup(imx8qxp_pc_bus_output_fmts,
> + sizeof(imx8qxp_pc_bus_output_fmts), GFP_KERNEL);
> +}
> +
> +static const struct drm_bridge_funcs imx8qxp_pc_bridge_funcs = {
> + .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,
> + .mode_valid = imx8qxp_pc_bridge_mode_valid,
> + .attach = imx8qxp_pc_bridge_attach,
> + .mode_set = imx8qxp_pc_bridge_mode_set,
> + .atomic_disable = imx8qxp_pc_bridge_atomic_disable,
> + .atomic_get_input_bus_fmts =
> + imx8qxp_pc_bridge_atomic_get_input_bus_fmts,
> + .atomic_get_output_bus_fmts =
> + imx8qxp_pc_bridge_atomic_get_output_bus_fmts,
> +};
> +
> +static int imx8qxp_pc_bridge_probe(struct platform_device *pdev)
> +{
> + struct imx8qxp_pc *pc;
> + struct imx8qxp_pc_channel *ch;
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *child, *remote;
> + u32 i;
> + int ret;
> +
> + pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
> + if (!pc)
> + return -ENOMEM;
> +
> + pc->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(pc->base))
> + return PTR_ERR(pc->base);
> +
> + pc->dev = dev;
> +
> + pc->clk_apb = devm_clk_get(dev, "apb");
> + if (IS_ERR(pc->clk_apb)) {
> + ret = PTR_ERR(pc->clk_apb);
> + if (ret != -EPROBE_DEFER)
> + DRM_DEV_ERROR(dev, "failed to get apb clock: %d\n",
> + ret);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, pc);
> + pm_runtime_enable(dev);
> +
> + for_each_available_child_of_node(np, child) {
> + ret = of_property_read_u32(child, "reg", &i);
> + if (ret || i > 1) {
> + ret = -EINVAL;
> + DRM_DEV_ERROR(dev,
> + "invalid channel(%u) node address\n", i);
> + goto free_child;
> + }
> +
> + ch = &pc->ch[i];
> + ch->pc = pc;
> + ch->stream_id = i;
> +
> + remote = of_graph_get_remote_node(child, 1, 0);
> + if (!remote) {
> + ret = -ENODEV;
> + DRM_DEV_ERROR(dev,
> + "channel%u failed to get port1's remote node: %d\n",
> + i, ret);
> + goto free_child;
> + }
> +
> + ch->next_bridge = of_drm_find_bridge(remote);
> + if (!ch->next_bridge) {
> + of_node_put(remote);
> + ret = -EPROBE_DEFER;
> + DRM_DEV_DEBUG_DRIVER(dev,
> + "channel%u failed to find next bridge: %d\n",
> + i, ret);
> + goto free_child;
> + }
> +
> + of_node_put(remote);
> +
> + ch->bridge.driver_private = ch;
> + ch->bridge.funcs = &imx8qxp_pc_bridge_funcs;
> + ch->bridge.of_node = child;
> + ch->is_available = true;
> +
> + drm_bridge_add(&ch->bridge);
> + }
> +
> + return 0;
> +
> +free_child:
> + of_node_put(child);
> +
> + if (i == 1 && pc->ch[0].next_bridge)
> + drm_bridge_remove(&pc->ch[0].bridge);
> +
> + pm_runtime_disable(dev);
> + return ret;
> +}
> +
> +static int imx8qxp_pc_bridge_remove(struct platform_device *pdev)
> +{
> + struct imx8qxp_pc *pc = platform_get_drvdata(pdev);
> + struct imx8qxp_pc_channel *ch;
> + int i;
> +
> + for (i = 0; i < 2; i++) {
> + ch = &pc->ch[i];
> +
> + if (!ch->is_available)
> + continue;
> +
> + drm_bridge_remove(&ch->bridge);
> + ch->is_available = false;
> + }
> +
> + pm_runtime_disable(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused imx8qxp_pc_runtime_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct imx8qxp_pc *pc = platform_get_drvdata(pdev);
> + int ret;
> +
> + ret = clk_prepare_enable(pc->clk_apb);
> + if (ret)
> + DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n",
> + __func__, ret);
> +
> + /* Disable pixel combiner by full reset. */
> + imx8qxp_pc_write_clr(pc, PC_SW_RESET_REG, PC_FULL_RESET_N);
> +
> + clk_disable_unprepare(pc->clk_apb);
> +
> + /* Ensure the reset takes effect. */
> + usleep_range(10, 20);
> +
> + return ret;
> +}
> +
> +static int __maybe_unused imx8qxp_pc_runtime_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct imx8qxp_pc *pc = platform_get_drvdata(pdev);
> + int ret;
> +
> + ret = clk_prepare_enable(pc->clk_apb);
> + if (ret) {
> + DRM_DEV_ERROR(pc->dev, "%s: failed to enable apb clock: %d\n",
> + __func__, ret);
> + return ret;
> + }
> +
> + /* out of reset */
> + imx8qxp_pc_write_set(pc, PC_SW_RESET_REG, PC_FULL_RESET_N);
> +
> + clk_disable_unprepare(pc->clk_apb);
> +
> + return ret;
> +}
> +
> +static const struct dev_pm_ops imx8qxp_pc_pm_ops = {
> + SET_RUNTIME_PM_OPS(imx8qxp_pc_runtime_suspend,
> + imx8qxp_pc_runtime_resume, NULL)
> +};
> +
> +static const struct of_device_id imx8qxp_pc_dt_ids[] = {
> + { .compatible = "fsl,imx8qm-pixel-combiner", },
> + { .compatible = "fsl,imx8qxp-pixel-combiner", },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx8qxp_pc_dt_ids);
> +
> +static struct platform_driver imx8qxp_pc_bridge_driver = {
> + .probe = imx8qxp_pc_bridge_probe,
> + .remove = imx8qxp_pc_bridge_remove,
> + .driver = {
> + .pm = &imx8qxp_pc_pm_ops,
> + .name = DRIVER_NAME,
> + .of_match_table = imx8qxp_pc_dt_ids,
> + },
> +};
> +module_platform_driver(imx8qxp_pc_bridge_driver);
> +
> +MODULE_DESCRIPTION("i.MX8QM/QXP pixel combiner bridge driver");
> +MODULE_AUTHOR("Liu Ying <victor.liu@....com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> --
> 2.7.4
>
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