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drm/bridge: tc358775: Add support for tc358765

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The tc358775 bridge is pin compatible with earlier tc358765 according to
the tc358774xbg_datasheet_en_20190118.pdf documentation. Compared to the
tc358765, the tc358775 supports a STBY GPIO and higher data rates.

The tc358765 has a register bit for video event mode vs video pulse mode.
We must set it to video event mode for the LCD output to work, and on the
tc358775, this bit no longer exists.

Looks like the registers seem to match otherwise based on a quick glance
comparing the defines to the earlier Android kernel tc358765 driver.

Reviewed-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240225062008.33191-10-tony@atomide.com
This commit is contained in:
Tony Lindgren 2024-02-25 08:19:38 +02:00 committed by Robert Foss
parent e2ee8e82cf
commit ce2196dbba
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GPG Key ID: 3EFD900F76D1D784
1 changed files with 22 additions and 4 deletions
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26
drivers/gpu/drm/bridge/tc358775.c
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@ -15,6 +15,7 @@
#include <linux/kernel.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
@ -107,6 +108,7 @@
#define RDPKTLN 0x0404 /* Command Read Packet Length */
#define VPCTRL 0x0450 /* Video Path Control */
#define EVTMODE BIT(5) /* Video event mode enable, tc35876x only */
#define HTIM1 0x0454 /* Horizontal Timing Control 1 */
#define HTIM2 0x0458 /* Horizontal Timing Control 2 */
#define VTIM1 0x045C /* Vertical Timing Control 1 */
@ -254,6 +256,11 @@ enum tc358775_ports {
TC358775_LVDS_OUT1,
};
enum tc3587x5_type {
TC358765 = 0x65,
TC358775 = 0x75,
};
struct tc_data {
struct i2c_client *i2c;
struct device *dev;
@ -271,6 +278,8 @@ struct tc_data {
struct gpio_desc *stby_gpio;
u8 lvds_link; /* single-link or dual-link */
u8 bpc;
enum tc3587x5_type type;
};
static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
@ -424,10 +433,16 @@ static void tc_bridge_enable(struct drm_bridge *bridge)
d2l_write(tc->i2c, PPI_STARTPPI, PPI_START_FUNCTION);
d2l_write(tc->i2c, DSI_STARTDSI, DSI_RX_START);
/* Video event mode vs pulse mode bit, does not exist for tc358775 */
if (tc->type == TC358765)
val = EVTMODE;
else
val = 0;
if (tc->bpc == 8)
val = TC358775_VPCTRL_OPXLFMT(1);
val |= TC358775_VPCTRL_OPXLFMT(1);
else /* bpc = 6; */
val = TC358775_VPCTRL_MSF(1);
val |= TC358775_VPCTRL_MSF(1);
dsiclk = mode->crtc_clock * 3 * tc->bpc / tc->num_dsi_lanes / 1000;
clkdiv = dsiclk / (tc->lvds_link == DUAL_LINK ? DIVIDE_BY_6 : DIVIDE_BY_3);
@ -641,6 +656,7 @@ static int tc_probe(struct i2c_client *client)
tc->dev = dev;
tc->i2c = client;
tc->type = (enum tc3587x5_type)(unsigned long)of_device_get_match_data(dev);
tc->panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node,
TC358775_LVDS_OUT0, 0);
@ -702,13 +718,15 @@ static void tc_remove(struct i2c_client *client)
}
static const struct i2c_device_id tc358775_i2c_ids[] = {
{ "tc358775", 0 },
{ "tc358765", TC358765, },
{ "tc358775", TC358775, },
{ }
};
MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
static const struct of_device_id tc358775_of_ids[] = {
{ .compatible = "toshiba,tc358775", },
{ .compatible = "toshiba,tc358765", .data = (void *)TC358765, },
{ .compatible = "toshiba,tc358775", .data = (void *)TC358775, },
{ }
};
MODULE_DEVICE_TABLE(of, tc358775_of_ids);