The ADV748x has two CSI-2 output port and one TTL input/output port for
digital video reception/transmission. The TTL digital pad is unconditionally
enabled during the device reset even if not used. Same goes for the TXA
and TXB CSI-2 outputs, which are enabled by the initial settings blob
programmed into the chip.
In order to improve power saving, do not enable unused output interfaces:
keep TTL output disabled, as it is not used, and drop CSI-2 output enabling
from the initial settings list, as they get conditionally enabled later.
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
drivers/media/i2c/adv748x/adv748x-core.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
index 72a6692..7b79b0c 100644
--- a/drivers/media/i2c/adv748x/adv748x-core.c
+++ b/drivers/media/i2c/adv748x/adv748x-core.c
@@ -386,8 +386,6 @@ static const struct adv748x_reg_value adv748x_init_txa_4lane[] = {
{ADV748X_PAGE_IO, 0x0c, 0xe0}, /* Enable LLC_DLL & Double LLC Timing */
{ADV748X_PAGE_IO, 0x0e, 0xdd}, /* LLC/PIX/SPI PINS TRISTATED AUD */
- /* Outputs Enabled */
- {ADV748X_PAGE_IO, 0x10, 0xa0}, /* Enable 4-lane CSI Tx & Pixel Port */
{ADV748X_PAGE_TXA, 0x00, 0x84}, /* Enable 4-lane MIPI */
{ADV748X_PAGE_TXA, 0x00, 0xa4}, /* Set Auto DPHY Timing */
@@ -441,10 +439,6 @@ static const struct adv748x_reg_value adv748x_init_txb_1lane[] = {
{ADV748X_PAGE_SDP, 0x31, 0x12}, /* ADI Required Write */
{ADV748X_PAGE_SDP, 0xe6, 0x4f}, /* V bit end pos manually in NTSC */
- /* Enable 1-Lane MIPI Tx, */
- /* enable pixel output and route SD through Pixel port */
- {ADV748X_PAGE_IO, 0x10, 0x70},
-
{ADV748X_PAGE_TXB, 0x00, 0x81}, /* Enable 1-lane MIPI */
{ADV748X_PAGE_TXB, 0x00, 0xa1}, /* Set Auto DPHY Timing */
{ADV748X_PAGE_TXB, 0xd2, 0x40}, /* ADI Required Write */
@@ -469,7 +463,7 @@ static const struct adv748x_reg_value adv748x_init_txb_1lane[] = {
static int adv748x_reset(struct adv748x_state *state)
{
int ret;
- u8 regval = ADV748X_IO_10_PIX_OUT_EN;
+ u8 regval = 0;
ret = adv748x_write_regs(state, adv748x_sw_reset);
if (ret < 0)
--
2.7.4
