[PATCH v5 1/4] drm/bridge: ti-sn65dsi86: check AUX errors better

[Tomi Valkeinen]

From: Tomi Valkeinen <tomi.valkeinen+renesas at ideasonboard.com>

The driver does not check AUX_IRQ_STATUS_NAT_I2C_FAIL bit at all when
sending AUX transfers, which leads to the driver not returning an error.

Add the check.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas at ideasonboard.com>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 90bbabde1595..ba84215c1511 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -582,6 +582,11 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux,
 		goto exit;
 	}
 
+	if (val & AUX_IRQ_STATUS_NAT_I2C_FAIL) {
+		ret = -EIO;
+		goto exit;
+	}
+
 	if (val & AUX_IRQ_STATUS_AUX_SHORT) {
 		ret = regmap_read(pdata->regmap, SN_AUX_LENGTH_REG, &len);
 		if (ret)
-- 
2.34.1