[PATCH v4 02/11] drm/bridge: it6505: fix aux operation for edid read

[Hermes Wu]

From: Hermes Wu <Hermes.wu at ite.com.tw>

The EDID read operation can reach the maximum size of the AUX FIFO buffer.

Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Signed-off-by: Hermes Wu <Hermes.wu at ite.com.tw>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 28a8043229d3..b451d3c2ac1d 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -1078,8 +1078,11 @@ static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
 	int i, ret_size, ret = 0, request_size;
 
 	mutex_lock(&it6505->aux_lock);
-	for (i = 0; i < size; i += 4) {
-		request_size = min((int)size - i, 4);
+	for (i = 0; i < size; ) {
+		if (cmd == CMD_AUX_I2C_EDID_READ)
+			request_size = min_t(int, (int)size - i, AUX_FIFO_MAX_SIZE);
+		else
+			request_size = min_t(int, (int)size - i, 4);
 		ret_size = it6505_aux_operation(it6505, cmd, address + i,
 						buffer + i, request_size,
 						reply);
@@ -1088,6 +1091,7 @@ static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
 			goto aux_op_err;
 		}
 
+		i += request_size;
 		ret += ret_size;
 	}
 
-- 
2.34.1