On Thu, Feb 14, 2019 at 09:09:51PM -0800, Vasily Khoruzhick wrote:
> From: Icenowy Zheng
>
> The ANX6345 is an ultra-low power DisplayPower/eDP transmitter designed
> for portable devices. This driver adds initial support for RGB to eDP
> mode, without HPD and interrupts.
>
> This is a configuration usually seen in eDP applications.
>
> Signed-off-by: Icenowy Zheng
> Signed-off-by: Vasily Khoruzhick
> ---
> drivers/gpu/drm/bridge/analogix/Kconfig | 11 +
> drivers/gpu/drm/bridge/analogix/Makefile | 1 +
> .../drm/bridge/analogix/analogix-anx6345.c| 845 ++
> .../drm/bridge/analogix/analogix-i2c-dptx.c | 2 +-
> .../drm/bridge/analogix/analogix-i2c-dptx.h | 8 +
> .../bridge/analogix/analogix-i2c-txcommon.h | 3 +
> 6 files changed, 869 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
>
[ ... ]
> +
> +static int anx6345_start(struct anx6345 *anx6345)
> +{
> + int err;
> +
> + if (!anx6345->powered)
> + anx6345_poweron(anx6345);
> +
> + /* Power on needed modules */
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
> + SP_POWERDOWN_CTRL_REG,
> + SP_VIDEO_PD | SP_LINK_PD);
> +
> + err = anx6345_tx_initialization(anx6345);
> + if (err) {
> + DRM_ERROR("Failed transmitter initialization: %d\n", err);
> + goto err_poweroff;
You can move the whole err_poweroff section from below here and drop the goto.
> + }
> +
> + /*
> + * This delay seems to help keep the hardware in a good state. Without
> + * it, there are times where it fails silently.
> + */
> + usleep_range(1, 15000);
> +
> + return 0;
> +
> +err_poweroff:
> + DRM_ERROR("Failed DisplayPort transmitter initialization: %d\n", err);
> + anx6345_poweroff(anx6345);
> +
> + return err;
> +}
> +
[ ... ]
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