From: Hermes Wu <Hermes.wu@xxxxxxxxxx>
The original AUX operation using data registers is limited to 4 bytes.
The AUX operation command CMD_AUX_I2C_EDID_READ uses AUX FIFO and
is capable of reading 16 bytes.
This improves the speed of EDID read.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Hermes Wu <hermes.wu@xxxxxxxxxx>
---
drivers/gpu/drm/bridge/ite-it6505.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 3272ca6951f2585f9592834869de23ac50ce41a4..9747d7ccf435d536da55c6a3ff79e504b7c724f0 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -1076,10 +1076,13 @@ static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
size_t size, enum aux_cmd_reply *reply)
{
int i, ret_size, ret = 0, request_size;
+ int fifo_max_size = (cmd == CMD_AUX_I2C_EDID_READ) ? AUX_FIFO_MAX_SIZE : 4;
mutex_lock(&it6505->aux_lock);
- for (i = 0; i < size; i += 4) {
- request_size = min((int)size - i, 4);
+ i = 0;
+ do {
+ request_size = min_t(int, (int)size - i, fifo_max_size);
+
ret_size = it6505_aux_operation(it6505, cmd, address + i,
buffer + i, request_size,
reply);
@@ -1088,8 +1091,9 @@ static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
goto aux_op_err;
}
+ i += request_size;
ret += ret_size;
- }
+ } while (i < size);
aux_op_err:
mutex_unlock(&it6505->aux_lock);
--
2.34.1
