[PATCH v5 5/9] drm/bridge: tc358764: Add DSI to LVDS bridge driver
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Fri Jul 27 10:30:00 UTC 2018
Hi Andrzej,
On Friday, 27 July 2018 10:17:50 EEST Andrzej Hajda wrote:
> On 26.07.2018 09:36, Archit Taneja wrote:
> > On Wednesday 25 July 2018 09:16 PM, Andrzej Hajda wrote:
> >> Add a drm_bridge driver for the Toshiba TC358764 DSI to LVDS bridge.
> >>
> >> Changes in v4:
> >> - removed license blob,
> >> - ordered includes,
> >> - added error handling,
> >> - fixed reset GPIO handling,
> >> - added missing calls to the panel,
> >> - custom OF graph code replaced with helpers,
> >> - removed tc358764_poweroff from remove callback.
> >> v5:
> >> - fixed supply names,
> >> - fixed broken console - added connector to fb_helper,
> >> - added detach callback - unbinding works,
> >> - fixed typo in error checking code,
> >> - removed sparse bridge->encoder check - core does it already.
> >>
> >> Signed-off-by: Andrzej Hajda <a.hajda at samsung.com>
> >> Signed-off-by: Maciej Purski <m.purski at samsung.com>
> >> [ a.hajda at samsung.com: v4, v5 ]
> >> Signed-off-by: Andrzej Hajda <a.hajda at samsung.com>
> >> ---
> >>
> >> drivers/gpu/drm/bridge/Kconfig | 8 +
> >> drivers/gpu/drm/bridge/Makefile | 1 +
> >> drivers/gpu/drm/bridge/tc358764.c | 499 ++++++++++++++++++++++++++++++
> >> 3 files changed, 508 insertions(+)
> >> create mode 100644 drivers/gpu/drm/bridge/tc358764.c
> >>
> >> diff --git a/drivers/gpu/drm/bridge/Kconfig
> >> b/drivers/gpu/drm/bridge/Kconfig index fa2c7997e2fd..f3da8a716833 100644
> >> --- a/drivers/gpu/drm/bridge/Kconfig
> >> +++ b/drivers/gpu/drm/bridge/Kconfig
> >> @@ -110,6 +110,14 @@ config DRM_THINE_THC63LVD1024
> >>
> >> ---help---
> >>
> >> Thine THC63LVD1024 LVDS/parallel converter driver.
> >>
> >> +config DRM_TOSHIBA_TC358764
> >> + tristate "TC358764 DSI/LVDS bridge"
> >> + depends on DRM && DRM_PANEL
> >> + depends on OF
> >> + select DRM_MIPI_DSI
> >> + help
> >> + Toshiba TC358764 DSI/LVDS bridge driver.
> >> +
> >>
> >> config DRM_TOSHIBA_TC358767
> >>
> >> tristate "Toshiba TC358767 eDP bridge"
> >> depends on OF
> >>
> >> diff --git a/drivers/gpu/drm/bridge/Makefile
> >> b/drivers/gpu/drm/bridge/Makefile index 35f88d48ec20..bf7c0cecf227
> >> 100644
> >> --- a/drivers/gpu/drm/bridge/Makefile
> >> +++ b/drivers/gpu/drm/bridge/Makefile
> >> @@ -10,6 +10,7 @@ obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
> >>
> >> obj-$(CONFIG_DRM_SII902X) += sii902x.o
> >> obj-$(CONFIG_DRM_SII9234) += sii9234.o
> >> obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> >>
> >> +obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> >>
> >> obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> >> obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
> >> obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> >>
> >> diff --git a/drivers/gpu/drm/bridge/tc358764.c
> >> b/drivers/gpu/drm/bridge/tc358764.c new file mode 100644
> >> index 000000000000..779bc5fce22a
> >> --- /dev/null
> >> +++ b/drivers/gpu/drm/bridge/tc358764.c
> >> @@ -0,0 +1,499 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +/*
> >> + * Copyright (C) 2018 Samsung Electronics Co., Ltd
> >> + *
> >> + * Authors:
> >> + * Andrzej Hajda <a.hajda at samsung.com>
> >> + * Maciej Purski <m.purski at samsung.com>
> >> + */
> >> +
> >> +#include <drm/drm_atomic_helper.h>
> >> +#include <drm/drm_crtc.h>
> >> +#include <drm/drm_crtc_helper.h>
> >> +#include <drm/drm_fb_helper.h>
> >> +#include <drm/drm_mipi_dsi.h>
> >> +#include <drm/drm_of.h>
> >> +#include <drm/drm_panel.h>
> >> +#include <drm/drmP.h>
> >> +#include <linux/gpio/consumer.h>
> >> +#include <linux/of_graph.h>
> >> +#include <linux/regulator/consumer.h>
> >> +#include <video/mipi_display.h>
> >> +
> >> +#define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) <<
> >> (end)) +#define FLD_VAL(val, start, end) (((val) << (end)) &
> >> FLD_MASK(start, end)) +
> >> +/* PPI layer registers */
> >> +#define PPI_STARTPPI 0x0104 /* START control bit */
> >> +#define PPI_LPTXTIMECNT 0x0114 /* LPTX timing signal */
> >> +#define PPI_LANEENABLE 0x0134 /* Enables each lane */
> >> +#define PPI_TX_RX_TA 0x013C /* BTA timing parameters */
> >> +#define PPI_D0S_CLRSIPOCOUNT 0x0164 /* Assertion timer for Lane 0 */
> >> +#define PPI_D1S_CLRSIPOCOUNT 0x0168 /* Assertion timer for Lane 1 */
> >> +#define PPI_D2S_CLRSIPOCOUNT 0x016C /* Assertion timer for Lane 2 */
> >> +#define PPI_D3S_CLRSIPOCOUNT 0x0170 /* Assertion timer for Lane 3 */
> >> +#define PPI_START_FUNCTION 1
> >> +
> >> +/* DSI layer registers */
> >> +#define DSI_STARTDSI 0x0204 /* START control bit of DSI-TX */
> >> +#define DSI_LANEENABLE 0x0210 /* Enables each lane */
> >> +#define DSI_RX_START 1
> >> +
> >> +/* Video path registers */
> >> +#define VP_CTRL 0x0450 /* Video Path Control */
> >> +#define VP_CTRL_MSF(v) FLD_VAL(v, 0, 0) /* Magic square in RGB666
*/
> >> +#define VP_CTRL_VTGEN(v) FLD_VAL(v, 4, 4) /* Use chip clock for timing
> >> */
> >> +#define VP_CTRL_EVTMODE(v) FLD_VAL(v, 5, 5) /* Event mode */
> >> +#define VP_CTRL_RGB888(v) FLD_VAL(v, 8, 8) /* RGB888 mode */
> >> +#define VP_CTRL_VSDELAY(v) FLD_VAL(v, 31, 20) /* VSYNC delay */
> >> +#define VP_CTRL_HSPOL BIT(17) /* Polarity of HSYNC signal */
> >> +#define VP_CTRL_DEPOL BIT(18) /* Polarity of DE signal */
> >> +#define VP_CTRL_VSPOL BIT(19) /* Polarity of VSYNC signal */
> >> +#define VP_HTIM1 0x0454 /* Horizontal Timing Control 1 */
> >> +#define VP_HTIM1_HBP(v) FLD_VAL(v, 24, 16)
> >> +#define VP_HTIM1_HSYNC(v) FLD_VAL(v, 8, 0)
> >> +#define VP_HTIM2 0x0458 /* Horizontal Timing Control 2 */
> >> +#define VP_HTIM2_HFP(v) FLD_VAL(v, 24, 16)
> >> +#define VP_HTIM2_HACT(v) FLD_VAL(v, 10, 0)
> >> +#define VP_VTIM1 0x045C /* Vertical Timing Control 1 */
> >> +#define VP_VTIM1_VBP(v) FLD_VAL(v, 23, 16)
> >> +#define VP_VTIM1_VSYNC(v) FLD_VAL(v, 7, 0)
> >> +#define VP_VTIM2 0x0460 /* Vertical Timing Control 2 */
> >> +#define VP_VTIM2_VFP(v) FLD_VAL(v, 23, 16)
> >> +#define VP_VTIM2_VACT(v) FLD_VAL(v, 10, 0)
> >> +#define VP_VFUEN 0x0464 /* Video Frame Timing Update Enable */
> >> +
> >> +/* LVDS registers */
> >> +#define LV_MX0003 0x0480 /* Mux input bit 0 to 3 */
> >> +#define LV_MX0407 0x0484 /* Mux input bit 4 to 7 */
> >> +#define LV_MX0811 0x0488 /* Mux input bit 8 to 11 */
> >> +#define LV_MX1215 0x048C /* Mux input bit 12 to 15 */
> >> +#define LV_MX1619 0x0490 /* Mux input bit 16 to 19 */
> >> +#define LV_MX2023 0x0494 /* Mux input bit 20 to 23 */
> >> +#define LV_MX2427 0x0498 /* Mux input bit 24 to 27 */
> >> +#define LV_MX(b0, b1, b2, b3) (FLD_VAL(b0, 4, 0) | FLD_VAL(b1, 12, 8)
|
> >> \
> >> + FLD_VAL(b2, 20, 16) | FLD_VAL(b3, 28, 24))
> >> +
> >> +/* Input bit numbers used in mux registers */
> >> +enum {
> >> + LVI_R0,
> >> + LVI_R1,
> >> + LVI_R2,
> >> + LVI_R3,
> >> + LVI_R4,
> >> + LVI_R5,
> >> + LVI_R6,
> >> + LVI_R7,
> >> + LVI_G0,
> >> + LVI_G1,
> >> + LVI_G2,
> >> + LVI_G3,
> >> + LVI_G4,
> >> + LVI_G5,
> >> + LVI_G6,
> >> + LVI_G7,
> >> + LVI_B0,
> >> + LVI_B1,
> >> + LVI_B2,
> >> + LVI_B3,
> >> + LVI_B4,
> >> + LVI_B5,
> >> + LVI_B6,
> >> + LVI_B7,
> >> + LVI_HS,
> >> + LVI_VS,
> >> + LVI_DE,
> >> + LVI_L0
> >> +};
> >> +
> >> +#define LV_CFG 0x049C /* LVDS Configuration */
> >> +#define LV_PHY0 0x04A0 /* LVDS PHY 0 */
> >> +#define LV_PHY0_RST(v) FLD_VAL(v, 22, 22) /* PHY reset */
> >> +#define LV_PHY0_IS(v) FLD_VAL(v, 15, 14)
> >> +#define LV_PHY0_ND(v) FLD_VAL(v, 4, 0) /* Frequency range select */
> >> +#define LV_PHY0_PRBS_ON(v) FLD_VAL(v, 20, 16) /* Clock/Data Flag pins
*/
> >> +
> >> +/* System registers */
> >> +#define SYS_RST 0x0504 /* System Reset */
> >> +#define SYS_ID 0x0580 /* System ID */
> >> +
> >> +#define SYS_RST_I2CS BIT(0) /* Reset I2C-Slave controller */
> >> +#define SYS_RST_I2CM BIT(1) /* Reset I2C-Master controller */
> >> +#define SYS_RST_LCD BIT(2) /* Reset LCD controller */
> >> +#define SYS_RST_BM BIT(3) /* Reset Bus Management controller */
> >> +#define SYS_RST_DSIRX BIT(4) /* Reset DSI-RX and App controller */
> >> +#define SYS_RST_REG BIT(5) /* Reset Register module */
> >> +
> >> +#define LPX_PERIOD 2
> >> +#define TTA_SURE 3
> >> +#define TTA_GET 0x20000
> >> +
> >> +/* Lane enable PPI and DSI register bits */
> >> +#define LANEENABLE_CLEN BIT(0)
> >> +#define LANEENABLE_L0EN BIT(1)
> >> +#define LANEENABLE_L1EN BIT(2)
> >> +#define LANEENABLE_L2EN BIT(3)
> >> +#define LANEENABLE_L3EN BIT(4)
> >> +
> >> +/* LVCFG fields */
> >> +#define LV_CFG_LVEN BIT(0)
> >> +#define LV_CFG_LVDLINK BIT(1)
> >> +#define LV_CFG_CLKPOL1 BIT(2)
> >> +#define LV_CFG_CLKPOL2 BIT(3)
> >> +
> >> +static const char * const tc358764_supplies[] = {
> >> + "vddc", "vddio", "vddlvds"
> >> +};
> >> +
> >> +struct tc358764 {
> >> + struct device *dev;
> >> + struct drm_bridge bridge;
> >> + struct drm_connector connector;
> >> + struct regulator_bulk_data supplies[ARRAY_SIZE(tc358764_supplies)];
> >> + struct gpio_desc *gpio_reset;
> >> + struct drm_panel *panel;
> >> + int error;
> >> +};
> >> +
> >> +static int tc358764_clear_error(struct tc358764 *ctx)
> >> +{
> >> + int ret = ctx->error;
> >> +
> >> + ctx->error = 0;
> >> + return ret;
> >> +}
> >> +
> >> +static void tc358764_read(struct tc358764 *ctx, u16 addr, u32 *val)
> >> +{
> >> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> >> + ssize_t ret;
> >> +
> >> + if (ctx->error)
> >> + return;
> >> +
> >> + cpu_to_le16s(&addr);
> >> + ret = mipi_dsi_generic_read(dsi, &addr, sizeof(addr), val,
> >> sizeof(*val));
> >> + if (ret >= 0)
> >> + le32_to_cpus(val);
> >> +
> >> + dev_dbg(ctx->dev, "read: %d, addr: %d\n", addr, *val);
> >> +}
> >> +
> >> +static void tc358764_write(struct tc358764 *ctx, u16 addr, u32 val)
> >> +{
> >> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> >> + ssize_t ret;
> >> + u8 data[6];
> >> +
> >> + if (ctx->error)
> >> + return;
> >> +
> >> + data[0] = addr;
> >> + data[1] = addr >> 8;
> >> + data[2] = val;
> >> + data[3] = val >> 8;
> >> + data[4] = val >> 16;
> >> + data[5] = val >> 24;
> >> +
> >> + ret = mipi_dsi_generic_write(dsi, data, sizeof(data));
> >> + if (ret < 0)
> >> + ctx->error = ret;
> >> +}
> >> +
> >> +static inline struct tc358764 *bridge_to_tc358764(struct drm_bridge
> >> *bridge) +{
> >> + return container_of(bridge, struct tc358764, bridge);
> >> +}
> >> +
> >> +static inline
> >> +struct tc358764 *connector_to_tc358764(struct drm_connector *connector)
> >> +{
> >> + return container_of(connector, struct tc358764, connector);
> >> +}
> >> +
> >> +static int tc358764_init(struct tc358764 *ctx)
> >> +{
> >> + u32 v = 0;
> >> +
> >> + tc358764_read(ctx, SYS_ID, &v);
> >> + if (ctx->error)
> >> + return tc358764_clear_error(ctx);
> >> + dev_info(ctx->dev, "ID: %#x\n", v);
> >> +
> >> + /* configure PPI counters */
> >> + tc358764_write(ctx, PPI_TX_RX_TA, TTA_GET | TTA_SURE);
> >> + tc358764_write(ctx, PPI_LPTXTIMECNT, LPX_PERIOD);
> >> + tc358764_write(ctx, PPI_D0S_CLRSIPOCOUNT, 5);
> >> + tc358764_write(ctx, PPI_D1S_CLRSIPOCOUNT, 5);
> >> + tc358764_write(ctx, PPI_D2S_CLRSIPOCOUNT, 5);
> >> + tc358764_write(ctx, PPI_D3S_CLRSIPOCOUNT, 5);
> >> +
> >> + /* enable four data lanes and clock lane */
> >> + tc358764_write(ctx, PPI_LANEENABLE, LANEENABLE_L3EN | LANEENABLE_L2EN |
> >> + LANEENABLE_L1EN | LANEENABLE_L0EN | LANEENABLE_CLEN);
> >> + tc358764_write(ctx, DSI_LANEENABLE, LANEENABLE_L3EN | LANEENABLE_L2EN |
> >> + LANEENABLE_L1EN | LANEENABLE_L0EN | LANEENABLE_CLEN);
> >> +
> >> + /* start */
> >> + tc358764_write(ctx, PPI_STARTPPI, PPI_START_FUNCTION);
> >> + tc358764_write(ctx, DSI_STARTDSI, DSI_RX_START);
> >> +
> >> + /* configure video path */
> >> + tc358764_write(ctx, VP_CTRL, VP_CTRL_VSDELAY(15) | VP_CTRL_RGB888(1) |
> >> + VP_CTRL_EVTMODE(1) | VP_CTRL_HSPOL | VP_CTRL_VSPOL);
> >> +
> >> + /* reset PHY */
> >> + tc358764_write(ctx, LV_PHY0, LV_PHY0_RST(1) |
> >> + LV_PHY0_PRBS_ON(4) | LV_PHY0_IS(2) | LV_PHY0_ND(6));
> >> + tc358764_write(ctx, LV_PHY0, LV_PHY0_PRBS_ON(4) | LV_PHY0_IS(2) |
> >> + LV_PHY0_ND(6));
> >> +
> >> + /* reset bridge */
> >> + tc358764_write(ctx, SYS_RST, SYS_RST_LCD);
> >> +
> >> + /* set bit order */
> >> + tc358764_write(ctx, LV_MX0003, LV_MX(LVI_R0, LVI_R1, LVI_R2, LVI_R3));
> >> + tc358764_write(ctx, LV_MX0407, LV_MX(LVI_R4, LVI_R7, LVI_R5, LVI_G0));
> >> + tc358764_write(ctx, LV_MX0811, LV_MX(LVI_G1, LVI_G2, LVI_G6, LVI_G7));
> >> + tc358764_write(ctx, LV_MX1215, LV_MX(LVI_G3, LVI_G4, LVI_G5, LVI_B0));
> >> + tc358764_write(ctx, LV_MX1619, LV_MX(LVI_B6, LVI_B7, LVI_B1, LVI_B2));
> >> + tc358764_write(ctx, LV_MX2023, LV_MX(LVI_B3, LVI_B4, LVI_B5, LVI_L0));
> >> + tc358764_write(ctx, LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_R6));
> >> + tc358764_write(ctx, LV_CFG, LV_CFG_CLKPOL2 | LV_CFG_CLKPOL1 |
> >> + LV_CFG_LVEN);
> >> +
> >> + return tc358764_clear_error(ctx);
> >> +}
> >> +
> >> +static void tc358764_reset(struct tc358764 *ctx)
> >> +{
> >> + gpiod_set_value(ctx->gpio_reset, 1);
> >> + usleep_range(1000, 2000);
> >> + gpiod_set_value(ctx->gpio_reset, 0);
> >> + usleep_range(1000, 2000);
> >> +}
> >> +
> >> +static int tc358764_get_modes(struct drm_connector *connector)
> >> +{
> >> + struct tc358764 *ctx = connector_to_tc358764(connector);
> >> +
> >> + return drm_panel_get_modes(ctx->panel);
> >> +}
> >> +
> >> +static const
> >> +struct drm_connector_helper_funcs tc358764_connector_helper_funcs = {
> >> + .get_modes = tc358764_get_modes,
> >> +};
> >> +
> >> +static const struct drm_connector_funcs tc358764_connector_funcs = {
> >> + .fill_modes = drm_helper_probe_single_connector_modes,
> >> + .destroy = drm_connector_cleanup,
> >> + .reset = drm_atomic_helper_connector_reset,
> >> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> >> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> >> +};
> >> +
> >> +static void tc358764_disable(struct drm_bridge *bridge)
> >> +{
> >> + struct tc358764 *ctx = bridge_to_tc358764(bridge);
> >> + int ret = drm_panel_disable(bridge_to_tc358764(bridge)->panel);
> >> +
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "error disabling panel (%d)\n", ret);
> >> +}
> >> +
> >> +static void tc358764_post_disable(struct drm_bridge *bridge)
> >> +{
> >> + struct tc358764 *ctx = bridge_to_tc358764(bridge);
> >> + int ret;
> >> +
> >> + ret = drm_panel_unprepare(ctx->panel);
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "error unpreparing panel (%d)\n", ret);
> >> + tc358764_reset(ctx);
> >> + usleep_range(10000, 15000);
> >> + ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "error disabling regulators (%d)\n", ret);
> >> +}
> >> +
> >> +static void tc358764_pre_enable(struct drm_bridge *bridge)
> >> +{
> >> + struct tc358764 *ctx = bridge_to_tc358764(bridge);
> >> + int ret;
> >> +
> >> + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "error enabling regulators (%d)\n", ret);
> >> + usleep_range(10000, 15000);
> >> + tc358764_reset(ctx);
> >> + ret = tc358764_init(ctx);
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "error initializing bridge (%d)\n", ret);
> >> + ret = drm_panel_prepare(ctx->panel);
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "error preparing panel (%d)\n", ret);
> >> +}
> >> +
> >> +static void tc358764_enable(struct drm_bridge *bridge)
> >> +{
> >> + struct tc358764 *ctx = bridge_to_tc358764(bridge);
> >> + int ret = drm_panel_enable(ctx->panel);
> >> +
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "error enabling panel (%d)\n", ret);
> >> +}
> >> +
> >> +static int tc358764_attach(struct drm_bridge *bridge)
> >> +{
> >> + struct tc358764 *ctx = bridge_to_tc358764(bridge);
> >> + struct drm_device *drm = bridge->dev;
> >> + int ret;
> >> +
> >> + ctx->connector.polled = DRM_CONNECTOR_POLL_HPD;
> >> + ret = drm_connector_init(drm, &ctx->connector,
> >> + &tc358764_connector_funcs,
> >> + DRM_MODE_CONNECTOR_LVDS);
> >> + if (ret) {
> >> + DRM_ERROR("Failed to initialize connector\n");
> >> + return ret;
> >> + }
> >> +
> >> + drm_connector_helper_add(&ctx->connector,
> >> + &tc358764_connector_helper_funcs);
> >> + drm_mode_connector_attach_encoder(&ctx->connector, bridge->encoder);
> >> + drm_panel_attach(ctx->panel, &ctx->connector);
> >> + ctx->connector.funcs->reset(&ctx->connector);
> >> + drm_fb_helper_add_one_connector(drm->fb_helper, &ctx->connector);
> >> + drm_connector_register(&ctx->connector);
> >
> > Aren't drm_connector_register()/unregister calls managed by the drm
> > core?
>
> drm core registers connectors during initialization but tc358764_attach
> can be called after bridge probe, also after drm initialization, in such
> case connector should be dynamically allocated/de-allocated.
This really, really, really calls for *NOT* creating drm_connector instances
in bridge drivers. This has been an issue since the beginning and we need to
fix it. Connectors should be created by display drivers, and connector
operations implemented using operations provided by bridges.
Futhermore, registering and unregistering connectors after probe time isn't
supported in the DRM core, this will lead to nasty races with userspace. This
is also something that we should fix, but it will be much more difficult to
tackle.
> > Otherwise:
> > Reviewed-by: Archit Taneja <architt at codeaurora.org>
>
> Thanks for the review, queued to drm-misc-next.
With the above issues ? :-(
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static void tc358764_detach(struct drm_bridge *bridge)
> >> +{
> >> + struct tc358764 *ctx = bridge_to_tc358764(bridge);
> >> + struct drm_device *drm = bridge->dev;
> >> +
> >> + drm_connector_unregister(&ctx->connector);
> >> + drm_fb_helper_remove_one_connector(drm->fb_helper, &ctx->connector);
> >> + drm_panel_detach(ctx->panel);
> >> + ctx->panel = NULL;
> >> + drm_connector_unreference(&ctx->connector);
> >> +}
> >> +
> >> +static const struct drm_bridge_funcs tc358764_bridge_funcs = {
> >> + .disable = tc358764_disable,
> >> + .post_disable = tc358764_post_disable,
> >> + .enable = tc358764_enable,
> >> + .pre_enable = tc358764_pre_enable,
> >> + .attach = tc358764_attach,
> >> + .detach = tc358764_detach,
> >> +};
> >> +
> >> +static int tc358764_parse_dt(struct tc358764 *ctx)
> >> +{
> >> + struct device *dev = ctx->dev;
> >> + int ret;
> >> +
> >> + ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> >> + if (IS_ERR(ctx->gpio_reset)) {
> >> + dev_err(dev, "no reset GPIO pin provided\n");
> >> + return PTR_ERR(ctx->gpio_reset);
> >> + }
> >> +
> >> + ret = drm_of_find_panel_or_bridge(ctx->dev->of_node, 1, 0, &ctx->panel,
> >> + NULL);
> >> + if (ret && ret != -EPROBE_DEFER)
> >> + dev_err(dev, "cannot find panel (%d)\n", ret);
> >> +
> >> + return ret;
> >> +}
> >> +
> >> +static int tc358764_configure_regulators(struct tc358764 *ctx)
> >> +{
> >> + int i, ret;
> >> +
> >> + for (i = 0; i < ARRAY_SIZE(ctx->supplies); ++i)
> >> + ctx->supplies[i].supply = tc358764_supplies[i];
> >> +
> >> + ret = devm_regulator_bulk_get(ctx->dev, ARRAY_SIZE(ctx->supplies),
> >> + ctx->supplies);
> >> + if (ret < 0)
> >> + dev_err(ctx->dev, "failed to get regulators: %d\n", ret);
> >> +
> >> + return ret;
> >> +}
> >> +
> >> +static int tc358764_probe(struct mipi_dsi_device *dsi)
> >> +{
> >> + struct device *dev = &dsi->dev;
> >> + struct tc358764 *ctx;
> >> + int ret;
> >> +
> >> + ctx = devm_kzalloc(dev, sizeof(struct tc358764), GFP_KERNEL);
> >> + if (!ctx)
> >> + return -ENOMEM;
> >> +
> >> + mipi_dsi_set_drvdata(dsi, ctx);
> >> +
> >> + ctx->dev = dev;
> >> +
> >> + dsi->lanes = 4;
> >> + dsi->format = MIPI_DSI_FMT_RGB888;
> >> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST
> >> + | MIPI_DSI_MODE_VIDEO_AUTO_VERT | MIPI_DSI_MODE_LPM;
> >> +
> >> + ret = tc358764_parse_dt(ctx);
> >> + if (ret < 0)
> >> + return ret;
> >> +
> >> + ret = tc358764_configure_regulators(ctx);
> >> + if (ret < 0)
> >> + return ret;
> >> +
> >> + ctx->bridge.funcs = &tc358764_bridge_funcs;
> >> + ctx->bridge.of_node = dev->of_node;
> >> +
> >> + drm_bridge_add(&ctx->bridge);
> >> +
> >> + ret = mipi_dsi_attach(dsi);
> >> + if (ret < 0) {
> >> + drm_bridge_remove(&ctx->bridge);
> >> + dev_err(dev, "failed to attach dsi\n");
> >> + }
> >> +
> >> + return ret;
> >> +}
> >> +
> >> +static int tc358764_remove(struct mipi_dsi_device *dsi)
> >> +{
> >> + struct tc358764 *ctx = mipi_dsi_get_drvdata(dsi);
> >> +
> >> + mipi_dsi_detach(dsi);
> >> + drm_bridge_remove(&ctx->bridge);
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static const struct of_device_id tc358764_of_match[] = {
> >> + { .compatible = "toshiba,tc358764" },
> >> + { }
> >> +};
> >> +MODULE_DEVICE_TABLE(of, tc358764_of_match);
> >> +
> >> +static struct mipi_dsi_driver tc358764_driver = {
> >> + .probe = tc358764_probe,
> >> + .remove = tc358764_remove,
> >> + .driver = {
> >> + .name = "tc358764",
> >> + .owner = THIS_MODULE,
> >> + .of_match_table = tc358764_of_match,
> >> + },
> >> +};
> >> +module_mipi_dsi_driver(tc358764_driver);
> >> +
> >> +MODULE_AUTHOR("Andrzej Hajda <a.hajda at samsung.com>");
> >> +MODULE_AUTHOR("Maciej Purski <m.purski at samsung.com>");
> >> +MODULE_DESCRIPTION("MIPI-DSI based Driver for TC358764 DSI/LVDS
> >> Bridge");
> >> +MODULE_LICENSE("GPL v2");
--
Regards,
Laurent Pinchart
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