Am Donnerstag, 9. Juni 2022, 08:49:26 CEST schrieb Liu Ying: > This patch adds a helper to support LDB drm bridge drivers for > i.MX SoCs. Helper functions supported by this helper should > implement common logics for all LDB modules embedded in i.MX SoCs. > > Tested-by: Marcel Ziswiler <marcel.ziswiler@xxxxxxxxxxx> # Colibri iMX8X, > LT170410-2WHC, LP156WF1 Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx> > Signed-off-by: Liu Ying <victor.liu@xxxxxxx> > --- Hi, reading this I got reminded of fsl-ldb [1], which is accepted already. At a first glance reading the RM the LDB peripheral are similar, although not identical. Is it worth merging them into one driver (at some point)? Best regards, Alexander [1] https://patchwork.freedesktop.org/patch/msgid/20220426193645.244792-2-marex@xxxxxxx > Marcel, I add your T-b tag from v6, let me know if you want me to drop it, > as the checkpatch fix in v7 and the rebase in v8 are trivial. > > v7->v8: > * Use devm_drm_of_get_bridge() due to the rebase upon v5.19-rc1. > > v6->v7: > * Fix below complaints from 'checkpatch.pl --strict'. (Robert) > - 'Alignment should match open parenthesis' > - 'Prefer using the BIT macro' > * Add Marcel's T-b tag. > * Add Robert's R-b tag. > > v5->v6: > * No change. > > v4->v5: > * Make imx-ldb-helper be a pure object to be linked with i.MX8qxp LDB bridge > driver and i.MX8qm LDB bridge driver. (Robert) > * Move 'imx_ldb_helper.h' to 'drivers/gpu/drm/bridge/imx/imx-ldb-helper.h'. > (Robert) > * s/__FSL_IMX_LDB__/__IMX_LDB_HELPER__/ for 'imx-ldb-helper.h'. > > v3->v4: > * No change. > > v2->v3: > * Call syscon_node_to_regmap() to get regmap instead of > syscon_regmap_lookup_by_phandle(). > > v1->v2: > * No change. > > drivers/gpu/drm/bridge/imx/imx-ldb-helper.c | 220 ++++++++++++++++++++ > drivers/gpu/drm/bridge/imx/imx-ldb-helper.h | 96 +++++++++ > 2 files changed, 316 insertions(+) > create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.c > create mode 100644 drivers/gpu/drm/bridge/imx/imx-ldb-helper.h > > diff --git a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c > b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c new file mode 100644 > index 000000000000..e85eb9ab5947 > --- /dev/null > +++ b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.c > @@ -0,0 +1,220 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Copyright (C) 2012 Sascha Hauer, Pengutronix > + * Copyright 2019,2020,2022 NXP > + */ > + > +#include <linux/mfd/syscon.h> > +#include <linux/of.h> > +#include <linux/regmap.h> > + > +#include <drm/drm_bridge.h> > +#include <drm/drm_of.h> > +#include <drm/drm_print.h> > + > +#include "imx-ldb-helper.h" > + > +bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch) > +{ > + return ldb_ch->link_type == LDB_CH_SINGLE_LINK; > +} > + > +bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch) > +{ > + return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS || > + ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS; > +} > + > +int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge, > + struct drm_bridge_state *bridge_state, > + struct drm_crtc_state *crtc_state, > + struct drm_connector_state *conn_state) > +{ > + struct ldb_channel *ldb_ch = bridge->driver_private; > + > + ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format; > + ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format; > + > + return 0; > +} > + > +void ldb_bridge_mode_set_helper(struct drm_bridge *bridge, > + const struct drm_display_mode *mode, > + const struct drm_display_mode *adjusted_mode) > +{ > + struct ldb_channel *ldb_ch = bridge->driver_private; > + struct ldb *ldb = ldb_ch->ldb; > + bool is_split = ldb_channel_is_split_link(ldb_ch); > + > + if (is_split) > + ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN; > + > + switch (ldb_ch->out_bus_format) { > + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: > + break; > + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: > + if (ldb_ch->chno == 0 || is_split) > + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24; > + if (ldb_ch->chno == 1 || is_split) > + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24; > + break; > + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: > + if (ldb_ch->chno == 0 || is_split) > + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 | > + LDB_BIT_MAP_CH0_JEIDA; > + if (ldb_ch->chno == 1 || is_split) > + ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 | > + LDB_BIT_MAP_CH1_JEIDA; > + break; > + } > +} > + > +void ldb_bridge_enable_helper(struct drm_bridge *bridge) > +{ > + struct ldb_channel *ldb_ch = bridge->driver_private; > + struct ldb *ldb = ldb_ch->ldb; > + > + /* > + * Platform specific bridge drivers should set ldb_ctrl properly > + * for the enablement, so just write the ctrl_reg here. > + */ > + regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl); > +} > + > +void ldb_bridge_disable_helper(struct drm_bridge *bridge) > +{ > + struct ldb_channel *ldb_ch = bridge->driver_private; > + struct ldb *ldb = ldb_ch->ldb; > + bool is_split = ldb_channel_is_split_link(ldb_ch); > + > + if (ldb_ch->chno == 0 || is_split) > + ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK; > + if (ldb_ch->chno == 1 || is_split) > + ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK; > + > + regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl); > +} > + > +int ldb_bridge_attach_helper(struct drm_bridge *bridge, > + enum drm_bridge_attach_flags flags) > +{ > + struct ldb_channel *ldb_ch = bridge->driver_private; > + struct ldb *ldb = ldb_ch->ldb; > + > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { > + DRM_DEV_ERROR(ldb->dev, > + "do not support creating a drm_connector\n"); > + return -EINVAL; > + } > + > + if (!bridge->encoder) { > + DRM_DEV_ERROR(ldb->dev, "missing encoder\n"); > + return -ENODEV; > + } > + > + return drm_bridge_attach(bridge->encoder, > + ldb_ch->next_bridge, bridge, > + DRM_BRIDGE_ATTACH_NO_CONNECTOR); > +} > + > +int ldb_init_helper(struct ldb *ldb) > +{ > + struct device *dev = ldb->dev; > + struct device_node *np = dev->of_node; > + struct device_node *child; > + int ret; > + u32 i; > + > + ldb->regmap = syscon_node_to_regmap(np->parent); > + if (IS_ERR(ldb->regmap)) { > + ret = PTR_ERR(ldb->regmap); > + if (ret != -EPROBE_DEFER) > + DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret); > + return ret; > + } > + > + for_each_available_child_of_node(np, child) { > + struct ldb_channel *ldb_ch; > + > + ret = of_property_read_u32(child, "reg", &i); > + if (ret || i > MAX_LDB_CHAN_NUM - 1) { > + ret = -EINVAL; > + DRM_DEV_ERROR(dev, > + "invalid channel node address: %u\n", i); > + of_node_put(child); > + return ret; > + } > + > + ldb_ch = ldb->channel[i]; > + ldb_ch->ldb = ldb; > + ldb_ch->chno = i; > + ldb_ch->is_available = true; > + ldb_ch->np = child; > + > + ldb->available_ch_cnt++; > + } > + > + return 0; > +} > + > +int ldb_find_next_bridge_helper(struct ldb *ldb) > +{ > + struct device *dev = ldb->dev; > + struct ldb_channel *ldb_ch; > + int ret, i; > + > + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) { > + ldb_ch = ldb->channel[i]; > + > + if (!ldb_ch->is_available) > + continue; > + > + ldb_ch->next_bridge = devm_drm_of_get_bridge(dev, ldb_ch->np, > + 1, 0); > + if (IS_ERR(ldb_ch->next_bridge)) { > + ret = PTR_ERR(ldb_ch->next_bridge); > + if (ret != -EPROBE_DEFER) > + DRM_DEV_ERROR(dev, > + "failed to get next bridge: %d\n", > + ret); > + return ret; > + } > + } > + > + return 0; > +} > + > +void ldb_add_bridge_helper(struct ldb *ldb, > + const struct drm_bridge_funcs *bridge_funcs) > +{ > + struct ldb_channel *ldb_ch; > + int i; > + > + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) { > + ldb_ch = ldb->channel[i]; > + > + if (!ldb_ch->is_available) > + continue; > + > + ldb_ch->bridge.driver_private = ldb_ch; > + ldb_ch->bridge.funcs = bridge_funcs; > + ldb_ch->bridge.of_node = ldb_ch->np; > + > + drm_bridge_add(&ldb_ch->bridge); > + } > +} > + > +void ldb_remove_bridge_helper(struct ldb *ldb) > +{ > + struct ldb_channel *ldb_ch; > + int i; > + > + for (i = 0; i < MAX_LDB_CHAN_NUM; i++) { > + ldb_ch = ldb->channel[i]; > + > + if (!ldb_ch->is_available) > + continue; > + > + drm_bridge_remove(&ldb_ch->bridge); > + } > +} > diff --git a/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h > b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h new file mode 100644 > index 000000000000..a0a5cde27fbc > --- /dev/null > +++ b/drivers/gpu/drm/bridge/imx/imx-ldb-helper.h > @@ -0,0 +1,96 @@ > +/* SPDX-License-Identifier: GPL-2.0+ */ > + > +/* > + * Copyright 2019,2020,2022 NXP > + */ > + > +#ifndef __IMX_LDB_HELPER__ > +#define __IMX_LDB_HELPER__ > + > +#include <linux/device.h> > +#include <linux/kernel.h> > +#include <linux/of.h> > +#include <linux/regmap.h> > + > +#include <drm/drm_atomic.h> > +#include <drm/drm_bridge.h> > +#include <drm/drm_device.h> > +#include <drm/drm_encoder.h> > +#include <drm/drm_modeset_helper_vtables.h> > + > +#define LDB_CH0_MODE_EN_TO_DI0 BIT(0) > +#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0) > +#define LDB_CH0_MODE_EN_MASK (3 << 0) > +#define LDB_CH1_MODE_EN_TO_DI0 BIT(2) > +#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2) > +#define LDB_CH1_MODE_EN_MASK (3 << 2) > +#define LDB_SPLIT_MODE_EN BIT(4) > +#define LDB_DATA_WIDTH_CH0_24 BIT(5) > +#define LDB_BIT_MAP_CH0_JEIDA BIT(6) > +#define LDB_DATA_WIDTH_CH1_24 BIT(7) > +#define LDB_BIT_MAP_CH1_JEIDA BIT(8) > +#define LDB_DI0_VS_POL_ACT_LOW BIT(9) > +#define LDB_DI1_VS_POL_ACT_LOW BIT(10) > + > +#define MAX_LDB_CHAN_NUM 2 > + > +enum ldb_channel_link_type { > + LDB_CH_SINGLE_LINK, > + LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS, > + LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS, > +}; > + > +struct ldb; > + > +struct ldb_channel { > + struct ldb *ldb; > + struct drm_bridge bridge; > + struct drm_bridge *next_bridge; > + struct device_node *np; > + u32 chno; > + bool is_available; > + u32 in_bus_format; > + u32 out_bus_format; > + enum ldb_channel_link_type link_type; > +}; > + > +struct ldb { > + struct regmap *regmap; > + struct device *dev; > + struct ldb_channel *channel[MAX_LDB_CHAN_NUM]; > + unsigned int ctrl_reg; > + u32 ldb_ctrl; > + unsigned int available_ch_cnt; > +}; > + > +#define bridge_to_ldb_ch(b) container_of(b, struct ldb_channel, bridge) > + > +bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch); > +bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch); > + > +int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge, > + struct drm_bridge_state *bridge_state, > + struct drm_crtc_state *crtc_state, > + struct drm_connector_state *conn_state); > + > +void ldb_bridge_mode_set_helper(struct drm_bridge *bridge, > + const struct drm_display_mode *mode, > + const struct drm_display_mode *adjusted_mode); > + > +void ldb_bridge_enable_helper(struct drm_bridge *bridge); > + > +void ldb_bridge_disable_helper(struct drm_bridge *bridge); > + > +int ldb_bridge_attach_helper(struct drm_bridge *bridge, > + enum drm_bridge_attach_flags flags); > + > +int ldb_init_helper(struct ldb *ldb); > + > +int ldb_find_next_bridge_helper(struct ldb *ldb); > + > +void ldb_add_bridge_helper(struct ldb *ldb, > + const struct drm_bridge_funcs *bridge_funcs); > + > +void ldb_remove_bridge_helper(struct ldb *ldb); > + > +#endif /* __IMX_LDB_HELPER__ */
