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drm/rockchip: dsi: Send turnaround request after a read request for dsi1

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dphy_tx1 need to manually handle turn around request to generate the BTA.

Test on RK3288

Change-Id: I0f552e57d1bea26aec3431f870773fbee3a705b9
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
This commit is contained in:
Wyon Bi
2019-04-28 15:32:20 +08:00
committed by Tao Huang
parent 5ecc90c53c
commit f324dff252
1 changed files with 47 additions and 0 deletions
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47
drivers/gpu/drm/rockchip/dw-mipi-dsi.c
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@@ -596,6 +596,46 @@ static int dw_mipi_dsi_shutdown_peripheral(struct dw_mipi_dsi *dsi)
return 0; return 0;
} }
static int dw_mipi_dsi_turn_around_request(struct dw_mipi_dsi *dsi)
{
u32 val;
int ret;
/*
* assign dphy_tx1_phyturnrequest = grf_dphy_tx1rx1_basedir ?
* dphy_tx1_phyturnrequest_i : grf_dphy_tx1rx1_turnrequest[0]
*/
if (!IS_DSI1(dsi))
return 0;
/* Set TURNREQUEST_N = 1'b1 */
grf_field_write(dsi, TURNREQUEST, 1);
/* Wait until DIRECTION_N output is set to 1'b1 */
ret = regmap_read_poll_timeout(dsi->regmap, DSI_PHY_STATUS,
val, val & PHY_DIRECTION, 0, 5000);
if (ret) {
dev_err(dsi->dev, "wait direction asserted timeout\n");
return ret;
}
/* Set TURNREQUEST_N = 1'b0 */
grf_field_write(dsi, TURNREQUEST, 0);
/*
* Wait until STOPSTATEDATA_N is asserted
* (turnaround procedure is completed)
*/
ret = regmap_read_poll_timeout(dsi->regmap, DSI_PHY_STATUS,
val, val & PHY_STOPSTATE0LANE, 0, 5000);
if (ret) {
dev_err(dsi->dev, "wait stopstatedata0 asserted timeout\n");
return ret;
}
return 0;
}
static void dw_mipi_dsi_host_power_on(struct dw_mipi_dsi *dsi) static void dw_mipi_dsi_host_power_on(struct dw_mipi_dsi *dsi)
{ {
regmap_write(dsi->regmap, DSI_PWR_UP, POWERUP); regmap_write(dsi->regmap, DSI_PWR_UP, POWERUP);
@@ -994,6 +1034,13 @@ static ssize_t dw_mipi_dsi_transfer(struct dw_mipi_dsi *dsi,
return ret; return ret;
if (msg->rx_len) { if (msg->rx_len) {
ret = dw_mipi_dsi_turn_around_request(dsi);
if (ret) {
dev_err(dsi->dev,
"failed to send turn around request\n");
return ret;
}
ret = dw_mipi_dsi_read_from_fifo(dsi, msg); ret = dw_mipi_dsi_read_from_fifo(dsi, msg);
if (ret < 0) if (ret < 0)
return ret; return ret;