Add driver for TI SN65DSI83 Single-link DSI to Single-link LVDS bridge
and TI SN65DSI84 Single-link DSI to Dual-link or 2x Single-link LVDS
bridge. TI SN65DSI85 is unsupported due to lack of hardware to test on,
but easy to add.
The driver operates the chip via I2C bus. Currently the LVDS clock are
always derived from DSI clock lane, which is the usual mode of operation.
Support for clock from external oscillator is not implemented, but it is
easy to add if ever needed. Only RGB888 pixel format is implemented, the
LVDS666 is not supported, but could be added if needed.
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Reviewed-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
Tested-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
Tested-by: Adam Ford <aford173@xxxxxxxxx>
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Loic Poulain <loic.poulain@xxxxxxxxxx>
Cc: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Cc: Valentin Raevsky <valentin@xxxxxxxxxxxxxx>
To: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
V2: - Use dev_err_probe()
- Set REG_RC_RESET as volatile
- Wait for PLL stabilization by polling REG_RC_LVDS_PLL
- Use ctx->mode = *adj instead of *mode in sn65dsi83_mode_set
- Add tested DSI84 support in dual-link mode
- Correctly set VCOM
- Fill in missing DSI CHB and LVDS CHB bits from DSI84 and DSI85
datasheets, with that all the reserved bits make far more sense
as the DSI83 and DSI84 seems to be reduced version of DSI85
V3: - Handle the dual-link LVDS with two port panel or bridge
V4: - Add RB from Linus Walleij
- Rename REG_DSI_LANE_LVDS_LINK_CFG_DUAL to
REG_DSI_LANE_DSI_CHANNEL_MODE_SINGLE and fill in the remaining
DSI link options from DSI85 datasheet. DSI85 can do dual and 2x
single DSI mode, but DSI85 is currently unsupported by the
driver. Add a comment about DSI85, so that all the places which
need to be adjusted for DSI85 are marked accordingly.
- Add REG_DSI_LANE_LEFT_RIGHT_PIXELS bit for DSI
- Add handling for JEIDA18/JEIDA24/SPWG24 LVDS formats. Use SPWG24
as fallback on output bridges until they are all fixed.
- Patch DSI bus format to fixed RGB888_1X24 instead of passing
through the LVDS bus format.
V5: - Move bus format patching to mode_fixup
- Use cpu_to_le16() to guarantee endianness in regmap_bulk_write()
V6: - Cast of_device_get_match_data() output to uintptr_t first
---
drivers/gpu/drm/bridge/Kconfig | 10 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/ti-sn65dsi83.c | 709 ++++++++++++++++++++++++++
3 files changed, 720 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi83.c
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 8e15b387e013..1df1704262d0 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -300,6 +300,16 @@ config DRM_TI_TFP410
help
Texas Instruments TFP410 DVI/HDMI Transmitter driver
+config DRM_TI_SN65DSI83
+ tristate "TI SN65DSI83 and SN65DSI84 DSI to LVDS bridge"
+ depends on OF
+ select DRM_KMS_HELPER
+ select REGMAP_I2C
+ select DRM_PANEL
+ select DRM_MIPI_DSI
+ help
+ Texas Instruments SN65DSI83 and SN65DSI84 DSI to LVDS Bridge driver
+
config DRM_TI_SN65DSI86
tristate "TI SN65DSI86 DSI to eDP bridge"
depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index e2218e40b3b3..61302be291af 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o
obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
+obj-$(CONFIG_DRM_TI_SN65DSI83) += ti-sn65dsi83.o
obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
obj-$(CONFIG_DRM_TI_TPD12S015) += ti-tpd12s015.o
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
new file mode 100644
index 000000000000..eff35611fabf
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -0,0 +1,709 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TI SN65DSI83,84,85 driver
+ *
+ * Currently supported:
+ * - SN65DSI83
+ * = 1x Single-link DSI ~ 1x Single-link LVDS
+ * - Supported
+ * - Single-link LVDS mode tested
+ * - SN65DSI84
+ * = 1x Single-link DSI ~ 2x Single-link or 1x Dual-link LVDS
+ * - Supported
+ * - Dual-link LVDS mode tested
+ * - 2x Single-link LVDS mode unsupported
+ * (should be easy to add by someone who has the HW)
+ * - SN65DSI85
+ * = 2x Single-link or 1x Dual-link DSI ~ 2x Single-link or 1x Dual-link LVDS
+ * - Unsupported
+ * (should be easy to add by someone who has the HW)
+ *
+ * Copyright (C) 2021 Marek Vasut <marex@xxxxxxx>
+ *
+ * Based on previous work of:
+ * Valentin Raevsky <valentin@xxxxxxxxxxxxxx>
+ * Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/regmap.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+/* ID registers */
+#define REG_ID(n) (0x00 + (n))
+/* Reset and clock registers */
+#define REG_RC_RESET 0x09
+#define REG_RC_RESET_SOFT_RESET BIT(0)
+#define REG_RC_LVDS_PLL 0x0a
+#define REG_RC_LVDS_PLL_PLL_EN_STAT BIT(7)
+#define REG_RC_LVDS_PLL_LVDS_CLK_RANGE(n) (((n) & 0x7) << 1)
+#define REG_RC_LVDS_PLL_HS_CLK_SRC_DPHY BIT(0)
+#define REG_RC_DSI_CLK 0x0b
+#define REG_RC_DSI_CLK_DSI_CLK_DIVIDER(n) (((n) & 0x1f) << 3)
+#define REG_RC_DSI_CLK_REFCLK_MULTIPLIER(n) ((n) & 0x3)
+#define REG_RC_PLL_EN 0x0d
+#define REG_RC_PLL_EN_PLL_EN BIT(0)
+/* DSI registers */
+#define REG_DSI_LANE 0x10
+#define REG_DSI_LANE_LEFT_RIGHT_PIXELS BIT(7) /* DSI85-only */
+#define REG_DSI_LANE_DSI_CHANNEL_MODE_DUAL 0 /* DSI85-only */
+#define REG_DSI_LANE_DSI_CHANNEL_MODE_2SINGLE BIT(6) /* DSI85-only */
+#define REG_DSI_LANE_DSI_CHANNEL_MODE_SINGLE BIT(5)
+#define REG_DSI_LANE_CHA_DSI_LANES(n) (((n) & 0x3) << 3)
+#define REG_DSI_LANE_CHB_DSI_LANES(n) (((n) & 0x3) << 1)
+#define REG_DSI_LANE_SOT_ERR_TOL_DIS BIT(0)
+#define REG_DSI_EQ 0x11
+#define REG_DSI_EQ_CHA_DSI_DATA_EQ(n) (((n) & 0x3) << 6)
+#define REG_DSI_EQ_CHA_DSI_CLK_EQ(n) (((n) & 0x3) << 2)
+#define REG_DSI_CLK 0x12
+#define REG_DSI_CLK_CHA_DSI_CLK_RANGE(n) ((n) & 0xff)
+/* LVDS registers */
+#define REG_LVDS_FMT 0x18
+#define REG_LVDS_FMT_DE_NEG_POLARITY BIT(7)
+#define REG_LVDS_FMT_HS_NEG_POLARITY BIT(6)
+#define REG_LVDS_FMT_VS_NEG_POLARITY BIT(5)
+#define REG_LVDS_FMT_LVDS_LINK_CFG BIT(4) /* 0:AB 1:A-only */
+#define REG_LVDS_FMT_CHA_24BPP_MODE BIT(3)
+#define REG_LVDS_FMT_CHB_24BPP_MODE BIT(2)
+#define REG_LVDS_FMT_CHA_24BPP_FORMAT1 BIT(1)
+#define REG_LVDS_FMT_CHB_24BPP_FORMAT1 BIT(0)
+#define REG_LVDS_VCOM 0x19
+#define REG_LVDS_VCOM_CHA_LVDS_VOCM BIT(6)
+#define REG_LVDS_VCOM_CHB_LVDS_VOCM BIT(4)
+#define REG_LVDS_VCOM_CHA_LVDS_VOD_SWING(n) (((n) & 0x3) << 2)
+#define REG_LVDS_VCOM_CHB_LVDS_VOD_SWING(n) ((n) & 0x3)
+#define REG_LVDS_LANE 0x1a
+#define REG_LVDS_LANE_EVEN_ODD_SWAP BIT(6)
+#define REG_LVDS_LANE_CHA_REVERSE_LVDS BIT(5)
+#define REG_LVDS_LANE_CHB_REVERSE_LVDS BIT(4)
+#define REG_LVDS_LANE_CHA_LVDS_TERM BIT(1)
+#define REG_LVDS_LANE_CHB_LVDS_TERM BIT(0)
+#define REG_LVDS_CM 0x1b
+#define REG_LVDS_CM_CHA_LVDS_CM_ADJUST(n) (((n) & 0x3) << 4)
+#define REG_LVDS_CM_CHB_LVDS_CM_ADJUST(n) ((n) & 0x3)
+/* Video registers */
+#define REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW 0x20
+#define REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH 0x21
+#define REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW 0x24
+#define REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH 0x25
+#define REG_VID_CHA_SYNC_DELAY_LOW 0x28
+#define REG_VID_CHA_SYNC_DELAY_HIGH 0x29
+#define REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW 0x2c
+#define REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH 0x2d
+#define REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW 0x30
+#define REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH 0x31
+#define REG_VID_CHA_HORIZONTAL_BACK_PORCH 0x34
+#define REG_VID_CHA_VERTICAL_BACK_PORCH 0x36
+#define REG_VID_CHA_HORIZONTAL_FRONT_PORCH 0x38
+#define REG_VID_CHA_VERTICAL_FRONT_PORCH 0x3a
+#define REG_VID_CHA_TEST_PATTERN 0x3c
+/* IRQ registers */
+#define REG_IRQ_GLOBAL 0xe0
+#define REG_IRQ_GLOBAL_IRQ_EN BIT(0)
+#define REG_IRQ_EN 0xe1
+#define REG_IRQ_EN_CHA_SYNCH_ERR_EN BIT(7)
+#define REG_IRQ_EN_CHA_CRC_ERR_EN BIT(6)
+#define REG_IRQ_EN_CHA_UNC_ECC_ERR_EN BIT(5)
+#define REG_IRQ_EN_CHA_COR_ECC_ERR_EN BIT(4)
+#define REG_IRQ_EN_CHA_LLP_ERR_EN BIT(3)
+#define REG_IRQ_EN_CHA_SOT_BIT_ERR_EN BIT(2)
+#define REG_IRQ_EN_CHA_PLL_UNLOCK_EN BIT(0)
+#define REG_IRQ_STAT 0xe5
+#define REG_IRQ_STAT_CHA_SYNCH_ERR BIT(7)
+#define REG_IRQ_STAT_CHA_CRC_ERR BIT(6)
+#define REG_IRQ_STAT_CHA_UNC_ECC_ERR BIT(5)
+#define REG_IRQ_STAT_CHA_COR_ECC_ERR BIT(4)
+#define REG_IRQ_STAT_CHA_LLP_ERR BIT(3)
+#define REG_IRQ_STAT_CHA_SOT_BIT_ERR BIT(2)
+#define REG_IRQ_STAT_CHA_PLL_UNLOCK BIT(0)
+
+enum sn65dsi83_model {
+ MODEL_SN65DSI83,
+ MODEL_SN65DSI84,
+};
+
+struct sn65dsi83 {
+ struct drm_bridge bridge;
+ struct drm_display_mode mode;
+ struct device *dev;
+ struct regmap *regmap;
+ struct device_node *host_node;
+ struct mipi_dsi_device *dsi;
+ struct drm_bridge *panel_bridge;
+ struct gpio_desc *enable_gpio;
+ int dsi_lanes;
+ bool lvds_dual_link;
+ bool lvds_dual_link_even_odd_swap;
+ bool lvds_format_24bpp;
+ bool lvds_format_jeida;
+};
+
+static const struct regmap_range sn65dsi83_readable_ranges[] = {
+ regmap_reg_range(REG_ID(0), REG_ID(8)),
+ regmap_reg_range(REG_RC_LVDS_PLL, REG_RC_DSI_CLK),
+ regmap_reg_range(REG_RC_PLL_EN, REG_RC_PLL_EN),
+ regmap_reg_range(REG_DSI_LANE, REG_DSI_CLK),
+ regmap_reg_range(REG_LVDS_FMT, REG_LVDS_CM),
+ regmap_reg_range(REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
+ REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH),
+ regmap_reg_range(REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
+ REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH),
+ regmap_reg_range(REG_VID_CHA_SYNC_DELAY_LOW,
+ REG_VID_CHA_SYNC_DELAY_HIGH),
+ regmap_reg_range(REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
+ REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH),
+ regmap_reg_range(REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
+ REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH),
+ regmap_reg_range(REG_VID_CHA_HORIZONTAL_BACK_PORCH,
+ REG_VID_CHA_HORIZONTAL_BACK_PORCH),
+ regmap_reg_range(REG_VID_CHA_VERTICAL_BACK_PORCH,
+ REG_VID_CHA_VERTICAL_BACK_PORCH),
+ regmap_reg_range(REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
+ REG_VID_CHA_HORIZONTAL_FRONT_PORCH),
+ regmap_reg_range(REG_VID_CHA_VERTICAL_FRONT_PORCH,
+ REG_VID_CHA_VERTICAL_FRONT_PORCH),
+ regmap_reg_range(REG_VID_CHA_TEST_PATTERN, REG_VID_CHA_TEST_PATTERN),
+ regmap_reg_range(REG_IRQ_GLOBAL, REG_IRQ_EN),
+ regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
+};
+
+static const struct regmap_access_table sn65dsi83_readable_table = {
+ .yes_ranges = sn65dsi83_readable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sn65dsi83_readable_ranges),
+};
+
+static const struct regmap_range sn65dsi83_writeable_ranges[] = {
+ regmap_reg_range(REG_RC_RESET, REG_RC_DSI_CLK),
+ regmap_reg_range(REG_RC_PLL_EN, REG_RC_PLL_EN),
+ regmap_reg_range(REG_DSI_LANE, REG_DSI_CLK),
+ regmap_reg_range(REG_LVDS_FMT, REG_LVDS_CM),
+ regmap_reg_range(REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
+ REG_VID_CHA_ACTIVE_LINE_LENGTH_HIGH),
+ regmap_reg_range(REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
+ REG_VID_CHA_VERTICAL_DISPLAY_SIZE_HIGH),
+ regmap_reg_range(REG_VID_CHA_SYNC_DELAY_LOW,
+ REG_VID_CHA_SYNC_DELAY_HIGH),
+ regmap_reg_range(REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
+ REG_VID_CHA_HSYNC_PULSE_WIDTH_HIGH),
+ regmap_reg_range(REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
+ REG_VID_CHA_VSYNC_PULSE_WIDTH_HIGH),
+ regmap_reg_range(REG_VID_CHA_HORIZONTAL_BACK_PORCH,
+ REG_VID_CHA_HORIZONTAL_BACK_PORCH),
+ regmap_reg_range(REG_VID_CHA_VERTICAL_BACK_PORCH,
+ REG_VID_CHA_VERTICAL_BACK_PORCH),
+ regmap_reg_range(REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
+ REG_VID_CHA_HORIZONTAL_FRONT_PORCH),
+ regmap_reg_range(REG_VID_CHA_VERTICAL_FRONT_PORCH,
+ REG_VID_CHA_VERTICAL_FRONT_PORCH),
+ regmap_reg_range(REG_VID_CHA_TEST_PATTERN, REG_VID_CHA_TEST_PATTERN),
+ regmap_reg_range(REG_IRQ_GLOBAL, REG_IRQ_EN),
+ regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
+};
+
+static const struct regmap_access_table sn65dsi83_writeable_table = {
+ .yes_ranges = sn65dsi83_writeable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sn65dsi83_writeable_ranges),
+};
+
+static const struct regmap_range sn65dsi83_volatile_ranges[] = {
+ regmap_reg_range(REG_RC_RESET, REG_RC_RESET),
+ regmap_reg_range(REG_RC_LVDS_PLL, REG_RC_LVDS_PLL),
+ regmap_reg_range(REG_IRQ_STAT, REG_IRQ_STAT),
+};
+
+static const struct regmap_access_table sn65dsi83_volatile_table = {
+ .yes_ranges = sn65dsi83_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(sn65dsi83_volatile_ranges),
+};
+
+static const struct regmap_config sn65dsi83_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .rd_table = &sn65dsi83_readable_table,
+ .wr_table = &sn65dsi83_writeable_table,
+ .volatile_table = &sn65dsi83_volatile_table,
+ .cache_type = REGCACHE_RBTREE,
+ .max_register = REG_IRQ_STAT,
+};
+
+static struct sn65dsi83 *bridge_to_sn65dsi83(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct sn65dsi83, bridge);
+}
+
+static int sn65dsi83_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
+ struct device *dev = ctx->dev;
+ struct mipi_dsi_device *dsi;
+ struct mipi_dsi_host *host;
+ int ret = 0;
+
+ const struct mipi_dsi_device_info info = {
+ .type = "sn65dsi83",
+ .channel = 0,
+ .node = NULL,
+ };
+
+ host = of_find_mipi_dsi_host_by_node(ctx->host_node);
+ if (!host) {
+ dev_err(dev, "failed to find dsi host\n");
+ return -EPROBE_DEFER;
+ }
+
+ dsi = mipi_dsi_device_register_full(host, &info);
+ if (IS_ERR(dsi)) {
+ return dev_err_probe(dev, PTR_ERR(dsi),
+ "failed to create dsi device\n");
+ }
+
+ ctx->dsi = dsi;
+
+ dsi->lanes = ctx->dsi_lanes;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ dev_err(dev, "failed to attach dsi to host\n");
+ goto err_dsi_attach;
+ }
+
+ return drm_bridge_attach(bridge->encoder, ctx->panel_bridge,
+ &ctx->bridge, flags);
+
+err_dsi_attach:
+ mipi_dsi_device_unregister(dsi);
+ return ret;
+}
+
+static void sn65dsi83_pre_enable(struct drm_bridge *bridge)
+{
+ struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
+
+ /*
+ * Reset the chip, pull EN line low for t_reset=10ms,
+ * then high for t_en=1ms.
+ */
+ regcache_mark_dirty(ctx->regmap);
+ gpiod_set_value(ctx->enable_gpio, 0);
+ usleep_range(10000, 11000);
+ gpiod_set_value(ctx->enable_gpio, 1);
+ usleep_range(1000, 1100);
+}
+
+static u8 sn65dsi83_get_lvds_range(struct sn65dsi83 *ctx)
+{
+ /*
+ * The encoding of the LVDS_CLK_RANGE is as follows:
+ * 000 - 25 MHz <= LVDS_CLK < 37.5 MHz
+ * 001 - 37.5 MHz <= LVDS_CLK < 62.5 MHz
+ * 010 - 62.5 MHz <= LVDS_CLK < 87.5 MHz
+ * 011 - 87.5 MHz <= LVDS_CLK < 112.5 MHz
+ * 100 - 112.5 MHz <= LVDS_CLK < 137.5 MHz
+ * 101 - 137.5 MHz <= LVDS_CLK <= 154 MHz
+ * which is a range of 12.5MHz..162.5MHz in 50MHz steps, except that
+ * the ends of the ranges are clamped to the supported range. Since
+ * sn65dsi83_mode_valid() already filters the valid modes and limits
+ * the clock to 25..154 MHz, the range calculation can be simplified
+ * as follows:
+ */
+ int mode_clock = ctx->mode.clock;
+
+ if (ctx->lvds_dual_link)
+ mode_clock /= 2;
+
+ return (mode_clock - 12500) / 25000;
+}
+
+static u8 sn65dsi83_get_dsi_range(struct sn65dsi83 *ctx)
+{
+ /*
+ * The encoding of the CHA_DSI_CLK_RANGE is as follows:
+ * 0x00 through 0x07 - Reserved
+ * 0x08 - 40 <= DSI_CLK < 45 MHz
+ * 0x09 - 45 <= DSI_CLK < 50 MHz
+ * ...
+ * 0x63 - 495 <= DSI_CLK < 500 MHz
+ * 0x64 - 500 MHz
+ * 0x65 through 0xFF - Reserved
+ * which is DSI clock in 5 MHz steps, clamped to 40..500 MHz.
+ * The DSI clock are calculated as:
+ * DSI_CLK = mode clock * bpp / dsi_data_lanes / 2
+ * the 2 is there because the bus is DDR.
+ */
+ return DIV_ROUND_UP(clamp((unsigned int)ctx->mode.clock *
+ mipi_dsi_pixel_format_to_bpp(ctx->dsi->format) /
+ ctx->dsi_lanes / 2, 40000U, 500000U), 5000U);
+}
+
+static u8 sn65dsi83_get_dsi_div(struct sn65dsi83 *ctx)
+{
+ /* The divider is (DSI_CLK / LVDS_CLK) - 1, which really is: */
+ unsigned int dsi_div = mipi_dsi_pixel_format_to_bpp(ctx->dsi->format);
+
+ dsi_div /= ctx->dsi_lanes;
+
+ if (!ctx->lvds_dual_link)
+ dsi_div /= 2;
+
+ return dsi_div - 1;
+}
+
+static void sn65dsi83_enable(struct drm_bridge *bridge)
+{
+ struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
+ unsigned int pval;
+ u16 val;
+ int ret;
+
+ /* Clear reset, disable PLL */
+ regmap_write(ctx->regmap, REG_RC_RESET, 0x00);
+ regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
+
+ /* Reference clock derived from DSI link clock. */
+ regmap_write(ctx->regmap, REG_RC_LVDS_PLL,
+ REG_RC_LVDS_PLL_LVDS_CLK_RANGE(sn65dsi83_get_lvds_range(ctx)) |
+ REG_RC_LVDS_PLL_HS_CLK_SRC_DPHY);
+ regmap_write(ctx->regmap, REG_DSI_CLK,
+ REG_DSI_CLK_CHA_DSI_CLK_RANGE(sn65dsi83_get_dsi_range(ctx)));
+ regmap_write(ctx->regmap, REG_RC_DSI_CLK,
+ REG_RC_DSI_CLK_DSI_CLK_DIVIDER(sn65dsi83_get_dsi_div(ctx)));
+
+ /* Set number of DSI lanes and LVDS link config. */
+ regmap_write(ctx->regmap, REG_DSI_LANE,
+ REG_DSI_LANE_DSI_CHANNEL_MODE_SINGLE |
+ REG_DSI_LANE_CHA_DSI_LANES(~(ctx->dsi_lanes - 1)) |
+ /* CHB is DSI85-only, set to default on DSI83/DSI84 */
+ REG_DSI_LANE_CHB_DSI_LANES(3));
+ /* No equalization. */
+ regmap_write(ctx->regmap, REG_DSI_EQ, 0x00);
+
+ /* Set up sync signal polarity. */
+ val = (ctx->mode.flags & DRM_MODE_FLAG_NHSYNC ?
+ REG_LVDS_FMT_HS_NEG_POLARITY : 0) |
+ (ctx->mode.flags & DRM_MODE_FLAG_NVSYNC ?
+ REG_LVDS_FMT_VS_NEG_POLARITY : 0);
+
+ /* Set up bits-per-pixel, 18bpp or 24bpp. */
+ if (ctx->lvds_format_24bpp) {
+ val |= REG_LVDS_FMT_CHA_24BPP_MODE;
+ if (ctx->lvds_dual_link)
+ val |= REG_LVDS_FMT_CHB_24BPP_MODE;
+ }
+
+ /* Set up LVDS format, JEIDA/Format 1 or SPWG/Format 2 */
+ if (ctx->lvds_format_jeida) {
+ val |= REG_LVDS_FMT_CHA_24BPP_FORMAT1;
+ if (ctx->lvds_dual_link)
+ val |= REG_LVDS_FMT_CHB_24BPP_FORMAT1;
+ }
+
+ /* Set up LVDS output config (DSI84,DSI85) */
+ if (!ctx->lvds_dual_link)
+ val |= REG_LVDS_FMT_LVDS_LINK_CFG;
+
+ regmap_write(ctx->regmap, REG_LVDS_FMT, val);
+ regmap_write(ctx->regmap, REG_LVDS_VCOM, 0x05);
+ regmap_write(ctx->regmap, REG_LVDS_LANE,
+ (ctx->lvds_dual_link_even_odd_swap ?
+ REG_LVDS_LANE_EVEN_ODD_SWAP : 0) |
+ REG_LVDS_LANE_CHA_LVDS_TERM |
+ REG_LVDS_LANE_CHB_LVDS_TERM);
+ regmap_write(ctx->regmap, REG_LVDS_CM, 0x00);
+
+ val = cpu_to_le16(ctx->mode.hdisplay);
+ regmap_bulk_write(ctx->regmap, REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW,
+ &val, 2);
+ val = cpu_to_le16(ctx->mode.vdisplay);
+ regmap_bulk_write(ctx->regmap, REG_VID_CHA_VERTICAL_DISPLAY_SIZE_LOW,
+ &val, 2);
+ /* 32 + 1 pixel clock to ensure proper operation */
+ val = cpu_to_le16(32 + 1);
+ regmap_bulk_write(ctx->regmap, REG_VID_CHA_SYNC_DELAY_LOW, &val, 2);
+ val = cpu_to_le16(ctx->mode.hsync_end - ctx->mode.hsync_start);
+ regmap_bulk_write(ctx->regmap, REG_VID_CHA_HSYNC_PULSE_WIDTH_LOW,
+ &val, 2);
+ val = cpu_to_le16(ctx->mode.vsync_end - ctx->mode.vsync_start);
+ regmap_bulk_write(ctx->regmap, REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
+ &val, 2);
+ regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_BACK_PORCH,
+ ctx->mode.htotal - ctx->mode.hsync_end);
+ regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_BACK_PORCH,
+ ctx->mode.vtotal - ctx->mode.vsync_end);
+ regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
+ ctx->mode.hsync_start - ctx->mode.hdisplay);
+ regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_FRONT_PORCH,
+ ctx->mode.vsync_start - ctx->mode.vdisplay);
+ regmap_write(ctx->regmap, REG_VID_CHA_TEST_PATTERN, 0x00);
+
+ /* Enable PLL */
+ regmap_write(ctx->regmap, REG_RC_PLL_EN, REG_RC_PLL_EN_PLL_EN);
+ usleep_range(3000, 4000);
+ ret = regmap_read_poll_timeout(ctx->regmap, REG_RC_LVDS_PLL, pval,
+ pval & REG_RC_LVDS_PLL_PLL_EN_STAT,
+ 1000, 100000);
+ if (ret) {
+ dev_err(ctx->dev, "failed to lock PLL, ret=%i\n", ret);
+ /* On failure, disable PLL again and exit. */
+ regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
+ return;
+ }
+
+ /* Trigger reset after CSR register update. */
+ regmap_write(ctx->regmap, REG_RC_RESET, REG_RC_RESET_SOFT_RESET);
+
+ /* Clear all errors that got asserted during initialization. */
+ regmap_read(ctx->regmap, REG_IRQ_STAT, &pval);
+ regmap_write(ctx->regmap, REG_IRQ_STAT, pval);
+}
+
+static void sn65dsi83_disable(struct drm_bridge *bridge)
+{
+ struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
+
+ /* Clear reset, disable PLL */
+ regmap_write(ctx->regmap, REG_RC_RESET, 0x00);
+ regmap_write(ctx->regmap, REG_RC_PLL_EN, 0x00);
+}
+
+static void sn65dsi83_post_disable(struct drm_bridge *bridge)
+{
+ struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
+
+ /* Put the chip in reset, pull EN line low. */
+ gpiod_set_value(ctx->enable_gpio, 0);
+}
+
+static enum drm_mode_status
+sn65dsi83_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_info *info,
+ const struct drm_display_mode *mode)
+{
+ /* LVDS output clock range 25..154 MHz */
+ if (mode->clock < 25000)
+ return MODE_CLOCK_LOW;
+ if (mode->clock > 154000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static void sn65dsi83_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adj)
+{
+ struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
+
+ ctx->mode = *adj;
+}
+
+static bool sn65dsi83_mode_fixup(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adj)
+{
+ struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
+ u32 input_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+ struct drm_encoder *encoder = bridge->encoder;
+ struct drm_device *ddev = encoder->dev;
+ struct drm_connector *connector;
+
+ /* The DSI format is always RGB888_1X24 */
+ list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
+ switch (connector->display_info.bus_formats[0]) {
+ case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+ ctx->lvds_format_24bpp = false;
+ ctx->lvds_format_jeida = true;
+ break;
+ case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
+ ctx->lvds_format_24bpp = true;
+ ctx->lvds_format_jeida = true;
+ break;
+ case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+ ctx->lvds_format_24bpp = true;
+ ctx->lvds_format_jeida = false;
+ break;
+ default:
+ /*
+ * Some bridges still don't set the correct
+ * LVDS bus pixel format, use SPWG24 default
+ * format until those are fixed.
+ */
+ ctx->lvds_format_24bpp = true;
+ ctx->lvds_format_jeida = false;
+ dev_warn(ctx->dev,
+ "Unsupported LVDS bus format 0x%04x, please check output bridge driver. Falling back to SPWG24.\n",
+ connector->display_info.bus_formats[0]);
+ break;
+ }
+
+ drm_display_info_set_bus_formats(&connector->display_info,
+ &input_bus_format, 1);
+ }
+
+ return true;
+}
+
+static const struct drm_bridge_funcs sn65dsi83_funcs = {
+ .attach = sn65dsi83_attach,
+ .pre_enable = sn65dsi83_pre_enable,
+ .enable = sn65dsi83_enable,
+ .disable = sn65dsi83_disable,
+ .post_disable = sn65dsi83_post_disable,
+ .mode_valid = sn65dsi83_mode_valid,
+ .mode_set = sn65dsi83_mode_set,
+ .mode_fixup = sn65dsi83_mode_fixup,
+};
+
+static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
+{
+ struct drm_bridge *panel_bridge;
+ struct device *dev = ctx->dev;
+ struct device_node *endpoint;
+ struct drm_panel *panel;
+ int ret;
+
+ endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
+ ctx->dsi_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
+ ctx->host_node = of_graph_get_remote_port_parent(endpoint);
+ of_node_put(endpoint);
+
+ if (ctx->dsi_lanes < 0 || ctx->dsi_lanes > 4)
+ return -EINVAL;
+ if (!ctx->host_node)
+ return -ENODEV;
+
+ ctx->lvds_dual_link = false;
+ ctx->lvds_dual_link_even_odd_swap = false;
+ if (model != MODEL_SN65DSI83) {
+ struct device_node *port2, *port3;
+ int dual_link;
+
+ port2 = of_graph_get_port_by_id(dev->of_node, 2);
+ port3 = of_graph_get_port_by_id(dev->of_node, 3);
+ dual_link = drm_of_lvds_get_dual_link_pixel_order(port2, port3);
+ of_node_put(port2);
+ of_node_put(port3);
+
+ if (dual_link == DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS) {
+ ctx->lvds_dual_link = true;
+ /* Odd pixels to LVDS Channel A, even pixels to B */
+ ctx->lvds_dual_link_even_odd_swap = false;
+ } else if (dual_link == DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS) {
+ ctx->lvds_dual_link = true;
+ /* Even pixels to LVDS Channel A, odd pixels to B */
+ ctx->lvds_dual_link_even_odd_swap = true;
+ }
+ }
+
+ ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &panel, &panel_bridge);
+ if (ret < 0)
+ return ret;
+ if (panel) {
+ panel_bridge = devm_drm_panel_bridge_add(dev, panel);
+ if (IS_ERR(panel_bridge))
+ return PTR_ERR(panel_bridge);
+ }
+
+ ctx->panel_bridge = panel_bridge;
+
+ return 0;
+}
+
+static int sn65dsi83_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ enum sn65dsi83_model model;
+ struct sn65dsi83 *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->dev = dev;
+
+ if (dev->of_node) {
+ model = (enum sn65dsi83_model)(uintptr_t)
+ of_device_get_match_data(dev);
+ } else {
+ model = id->driver_data;
+ }
+
+ ctx->enable_gpio = devm_gpiod_get(ctx->dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(ctx->enable_gpio))
+ return PTR_ERR(ctx->enable_gpio);
+
+ ret = sn65dsi83_parse_dt(ctx, model);
+ if (ret)
+ return ret;
+
+ ctx->regmap = devm_regmap_init_i2c(client, &sn65dsi83_regmap_config);
+ if (IS_ERR(ctx->regmap))
+ return PTR_ERR(ctx->regmap);
+
+ dev_set_drvdata(dev, ctx);
+ i2c_set_clientdata(client, ctx);
+
+ ctx->bridge.funcs = &sn65dsi83_funcs;
+ ctx->bridge.of_node = dev->of_node;
+ drm_bridge_add(&ctx->bridge);
+
+ return 0;
+}
+
+static int sn65dsi83_remove(struct i2c_client *client)
+{
+ struct sn65dsi83 *ctx = i2c_get_clientdata(client);
+
+ mipi_dsi_detach(ctx->dsi);
+ mipi_dsi_device_unregister(ctx->dsi);
+ drm_bridge_remove(&ctx->bridge);
+ of_node_put(ctx->host_node);
+
+ return 0;
+}
+
+static struct i2c_device_id sn65dsi83_id[] = {
+ { "ti,sn65dsi83", MODEL_SN65DSI83 },
+ { "ti,sn65dsi84", MODEL_SN65DSI84 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, sn65dsi83_id);
+
+static const struct of_device_id sn65dsi83_match_table[] = {
+ { .compatible = "ti,sn65dsi83", .data = (void *)MODEL_SN65DSI83 },
+ { .compatible = "ti,sn65dsi84", .data = (void *)MODEL_SN65DSI84 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sn65dsi83_match_table);
+
+static struct i2c_driver sn65dsi83_driver = {
+ .probe = sn65dsi83_probe,
+ .remove = sn65dsi83_remove,
+ .id_table = sn65dsi83_id,
+ .driver = {
+ .name = "sn65dsi83",
+ .of_match_table = sn65dsi83_match_table,
+ },
+};
+module_i2c_driver(sn65dsi83_driver);
+
+MODULE_AUTHOR("Marek Vasut <marex@xxxxxxx>");
+MODULE_DESCRIPTION("TI SN65DSI83 DSI to LVDS bridge driver");
+MODULE_LICENSE("GPL v2");
--
2.30.2
