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drm/bridge: it6505: improve AUX operation for edid read

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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@linaro.org>
Signed-off-by: Hermes Wu <hermes.wu@ite.com.tw>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241230-v7-upstream-v7-2-e0fdd4844703@ite.corp-partner.google.com
This commit is contained in:
Hermes Wu
2024-12-30 18:51:20 +08:00
committed by Dmitry Baryshkov
parent c14870218c
commit d0c97a51cd
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/bridge/ite-it6505.c
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@@ -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);