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

[Jacopo Mondi]

From: Phong Hoang <phong.hoang...@renesas.com>

Add a check to the register access function when attaching a bridge
device.

Signed-off-by: Phong Hoang <phong.hoang...@renesas.com>
Signed-off-by: Jacopo Mondi <jacopo.mo...@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;
 
-- 
2.45.2