On 27.06.2019 10:59, Lucas Stach wrote:
> To get the chip into the expected state, even when the hardware reset pin
> isn't connected, do a software reset in this case. It isn't as thorough as
> the hardware reset, as the I2C communication block can not be reset for
> obvious reasons, but it's getting the chip into a defined state.
>
> Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
Queued to drm-misc-next.
Regards
Andrzej
> ---
> drivers/gpu/drm/bridge/tc358767.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c
> b/drivers/gpu/drm/bridge/tc358767.c
> index 13ade28a36a8..1d5ba451e268 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -70,6 +70,13 @@
> #define DP0_VIDSRC_DSI_RX (1 << 0)
> #define DP0_VIDSRC_DPI_RX (2 << 0)
> #define DP0_VIDSRC_COLOR_BAR (3 << 0)
> +#define SYSRSTENB 0x050c
> +#define ENBI2C (1 << 0)
> +#define ENBLCD0 (1 << 2)
> +#define ENBBM (1 << 3)
> +#define ENBDSIRX (1 << 4)
> +#define ENBREG (1 << 5)
> +#define ENBHDCP (1 << 8)
> #define GPIOM 0x0540
> #define GPIOC 0x0544
> #define GPIOO 0x0548
> @@ -1497,6 +1504,22 @@ static int tc_probe(struct i2c_client *client, const
> struct i2c_device_id *id)
>
> tc->assr = (tc->rev == 0x6601); /* Enable ASSR for eDP panels */
>
> + if (!tc->reset_gpio) {
> + /*
> + * If the reset pin isn't present, do a software reset. It isn't
> + * as thorough as the hardware reset, as we can't reset the I2C
> + * communication block for obvious reasons, but it's getting the
> + * chip into a defined state.
> + */
> + regmap_update_bits(tc->regmap, SYSRSTENB,
> + ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP,
> + 0);
> + regmap_update_bits(tc->regmap, SYSRSTENB,
> + ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP,
> + ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP);
> + usleep_range(5000, 10000);
> + }
> +
> if (tc->hpd_pin >= 0) {
> u32 lcnt_reg = tc->hpd_pin == 0 ? INT_GP0_LCNT : INT_GP1_LCNT;
> u32 h_lc = INT_GPIO_H(tc->hpd_pin) | INT_GPIO_LC(tc->hpd_pin);
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