Some edp screen do not have hpd signal, so we can't just return failed when hpd plug in detect failed.
Besides TRM indicate that if HPD_STATUS(RO) is 0, AUX CH will not work, so we need to give a force hpd action to set HPD_STATUS manually.
Signed-off-by: Yakir Yang ykk@rock-chips.com --- Changes in v2: None
drivers/gpu/drm/bridge/analogix_dp_core.c | 28 +++++++++++++++++++++++----- drivers/gpu/drm/bridge/analogix_dp_core.h | 1 + drivers/gpu/drm/bridge/analogix_dp_reg.c | 9 +++++++++ 3 files changed, 33 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix_dp_core.c index 44be01d..efd810c 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix_dp_core.c @@ -66,15 +66,33 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp) { int timeout_loop = 0;
- while (analogix_dp_get_plug_in_status(dp) != 0) { + while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) { + if (analogix_dp_get_plug_in_status(dp) == 0) + return 0; + timeout_loop++; - if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { - dev_err(dp->dev, "failed to get hpd plug status\n"); - return -ETIMEDOUT; - } usleep_range(10, 11); }
+ /* + * Some edp screen do not have hpd signal, so we can't just + * return failed when hpd plug in detect failed. + * + * Besides TRM indicate that if HPD_STATUS(RO) is 0, AUX CH + * will not work, so we need to give a force hpd action to + * set HPD_STATUS manually. + */ + dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n"); + + analogix_dp_force_hpd(dp); + + if (analogix_dp_get_plug_in_status(dp) != 0) { + dev_err(dp->dev, "failed to get hpd plug in status\n"); + return -ETIMEDOUT; + } + + dev_dbg(dp->dev, "success to get plug in status after force hpd\n"); + return 0; }
diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix_dp_core.h index 713c57f..53f3973 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_core.h +++ b/drivers/gpu/drm/bridge/analogix_dp_core.h @@ -182,6 +182,7 @@ void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp, bool enable); void analogix_dp_init_analog_func(struct analogix_dp_device *dp); void analogix_dp_init_hpd(struct analogix_dp_device *dp); +void analogix_dp_force_hpd(struct analogix_dp_device *dp); enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp); void analogix_dp_clear_hotplug_interrupts(struct analogix_dp_device *dp); void analogix_dp_reset_aux(struct analogix_dp_device *dp); diff --git a/drivers/gpu/drm/bridge/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix_dp_reg.c index a0fc1fb..bf7cee1 100644 --- a/drivers/gpu/drm/bridge/analogix_dp_reg.c +++ b/drivers/gpu/drm/bridge/analogix_dp_reg.c @@ -365,6 +365,15 @@ void analogix_dp_init_hpd(struct analogix_dp_device *dp) writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3); }
+void analogix_dp_force_hpd(struct analogix_dp_device *dp) +{ + u32 reg; + + reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_3); + reg = (F_HPD | HPD_CTRL); + writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3); +} + enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp) { u32 reg;