[PATCH 2/4] drm: ti-sn65dsi86: Check bridge connection failure

[Laurent Pinchart]

Hi Jacopo,

Thank you for the patch.

On Wed, Jun 19, 2024 at 12:22:16PM +0200, Jacopo Mondi wrote:
> From: Phong Hoang <phong.hoang.wz at renesas.com>
> 
> Add a check to the register access function when attaching a bridge
> device.
> 
> Signed-off-by: Phong Hoang <phong.hoang.wz at renesas.com>
> Signed-off-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>

> ---
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index 84698a0b27a8..b7df53577987 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -696,6 +696,7 @@ static struct ti_sn65dsi86 *bridge_to_ti_sn65dsi86(struct drm_bridge *bridge)
>  
>  static int ti_sn_attach_host(struct auxiliary_device *adev, struct ti_sn65dsi86 *pdata)
>  {
> +	int ret;
>  	int val;
>  	struct mipi_dsi_host *host;
>  	struct mipi_dsi_device *dsi;
> @@ -720,8 +721,11 @@ static int ti_sn_attach_host(struct auxiliary_device *adev, struct ti_sn65dsi86
>  
>  	/* check if continuous dsi clock is required or not */
>  	pm_runtime_get_sync(dev);
> -	regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val);
> +	ret = regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val);
>  	pm_runtime_put_autosuspend(dev);
> +	if (ret)
> +		return ret;
> +
>  	if (!(val & DPPLL_CLK_SRC_DSICLK))
>  		dsi->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS;
>  

-- 
Regards,

Laurent Pinchart