[PATCH v2 09/10] drm/bridge: tc358775: Add support for tc358765

[Dmitry Baryshkov]

On Sat, 2 Dec 2023 at 10:04, Tony Lindgren <tony at atomide.com> wrote:
>
> 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.
>
> Signed-off-by: Tony Lindgren <tony at atomide.com>
> ---
>  drivers/gpu/drm/bridge/tc358775.c | 26 ++++++++++++++++++++++----
>  1 file changed, 22 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> --- a/drivers/gpu/drm/bridge/tc358775.c
> +++ b/drivers/gpu/drm/bridge/tc358775.c
> @@ -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,

I'd suggest adding = 1 or =0x65 so that the specified type differs
from 'no data' = 0 / NULL.

> +       TC358775,
> +};
> +
>  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);
> @@ -643,6 +658,7 @@ static int tc_probe(struct i2c_client *client)
>
>         tc->dev = dev;
>         tc->i2c = client;
> +       tc->type = (enum tc3587x5_type)of_device_get_match_data(dev);

Would it make sense to use i2c_get_match_data() instead?

>
>         tc->panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node,
>                                                   TC358775_LVDS_OUT0, 0);
> @@ -704,13 +720,15 @@ 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);
> --
> 2.43.0



-- 
With best wishes
Dmitry