Both anx78xx_set_bits() and anx78xx_clear_bits() in the poweron process
may fail. The fix inserts checks for their return values.
Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>
---
drivers/gpu/drm/bridge/analogix-anx78xx.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/bridge/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix-anx78xx.c
index f8433c93f463..3b0fe2b188db 100644
--- a/drivers/gpu/drm/bridge/analogix-anx78xx.c
+++ b/drivers/gpu/drm/bridge/analogix-anx78xx.c
@@ -638,10 +638,22 @@ static void anx78xx_poweron(struct anx78xx *anx78xx)
gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
/* Power on registers module */
- anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
- SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
- anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
- SP_REGISTER_PD | SP_TOTAL_PD);
+ err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2],
+ SP_POWERDOWN_CTRL_REG,
+ SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
+ if (err) {
+ DRM_ERROR("Failed to set register bits: %d\n",
+ err);
+ return;
+ }
+ err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2],
+ SP_POWERDOWN_CTRL_REG,
+ SP_REGISTER_PD | SP_TOTAL_PD);
+ if (err) {
+ DRM_ERROR("Failed to clear register bits: %d\n",
+ err);
+ return;
+ }
anx78xx->powered = true;
}
--
2.17.2 (Apple Git-113)
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