On 24/06/2024 11:41, Jonas Karlman wrote:
Hi Neil,
On 2024-06-24 11:23, Neil Armstrong wrote:
On 11/06/2024 17:50, Jonas Karlman wrote:
Change to only call poweron/poweroff from atomic_enable/atomic_disable
ops instead of trying to keep a bridge_is_on state and poweron/off in
the hotplug irq handler.
A benefit of this is that drm mode_config mutex is always held at
poweron/off, something that may reduce the need for our own mutex.
Signed-off-by: Jonas Karlman <jonas@xxxxxxxxx>
---
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 33 ++---------------------
1 file changed, 2 insertions(+), 31 deletions(-)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 9f2bc932c371..34bc6f4754b8 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -172,7 +172,6 @@ struct dw_hdmi {
enum drm_connector_force force; /* mutex-protected force state */
struct drm_connector *curr_conn;/* current connector (only valid when !disabled) */
bool disabled; /* DRM has disabled our bridge */
- bool bridge_is_on; /* indicates the bridge is on */
bool rxsense; /* rxsense state */
u8 phy_mask; /* desired phy int mask settings */
u8 mc_clkdis; /* clock disable register */
@@ -2383,8 +2382,6 @@ static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi)
static void dw_hdmi_poweron(struct dw_hdmi *hdmi)
{
- hdmi->bridge_is_on = true;
-
/*
* The curr_conn field is guaranteed to be valid here, as this function
* is only be called when !hdmi->disabled.
@@ -2398,30 +2395,6 @@ static void dw_hdmi_poweroff(struct dw_hdmi *hdmi)
hdmi->phy.ops->disable(hdmi, hdmi->phy.data);
hdmi->phy.enabled = false;
}
-
- hdmi->bridge_is_on = false;
-}
-
-static void dw_hdmi_update_power(struct dw_hdmi *hdmi)
-{
- int force = hdmi->force;
-
- if (hdmi->disabled) {
- force = DRM_FORCE_OFF;
- } else if (force == DRM_FORCE_UNSPECIFIED) {
- if (hdmi->rxsense)
- force = DRM_FORCE_ON;
- else
- force = DRM_FORCE_OFF;
- }
This means we always poweron the bridge even if rxsense is false ?
If I follow the logic there should not be any difference, beside that
power on now only happen in atomic_enable instead of sometime in irq
handler.
hdmi->rxsense is set to true based on hpd in dw_hdmi_setup_rx_sense().
For both meson and dw-hdmi this means HPD=1 and not rxsense=1.
Yeah I know, I was worried for other platforms using rxsense
drm core will call the force/detect ops and enable/disable based on
forced/HPD state, so I am not expecting any difference in how this
currently works.
This change to only poweron/setup in atomic_enable should also fix
issues/situations where dw-hdmi was poweron too early during bootup in
irq handler, before the drm driver was fully probed.
Hmm, but I thought the code wouldn't poweron the bridge is rxsense was 0
even if a mode was set, this won't work like this anymore right ?
Neil
Regards,
Jonas
Neil
-
- if (force == DRM_FORCE_OFF) {
- if (hdmi->bridge_is_on)
- dw_hdmi_poweroff(hdmi);
- } else {
- if (!hdmi->bridge_is_on)
- dw_hdmi_poweron(hdmi);
- }
}
/*
@@ -2546,7 +2519,6 @@ static void dw_hdmi_connector_force(struct drm_connector *connector)
mutex_lock(&hdmi->mutex);
hdmi->force = connector->force;
- dw_hdmi_update_power(hdmi);
dw_hdmi_update_phy_mask(hdmi);
mutex_unlock(&hdmi->mutex);
}
@@ -2955,7 +2927,7 @@ static void dw_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
mutex_lock(&hdmi->mutex);
hdmi->disabled = true;
hdmi->curr_conn = NULL;
- dw_hdmi_update_power(hdmi);
+ dw_hdmi_poweroff(hdmi);
dw_hdmi_update_phy_mask(hdmi);
handle_plugged_change(hdmi, false);
mutex_unlock(&hdmi->mutex);
@@ -2974,7 +2946,7 @@ static void dw_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
mutex_lock(&hdmi->mutex);
hdmi->disabled = false;
hdmi->curr_conn = connector;
- dw_hdmi_update_power(hdmi);
+ dw_hdmi_poweron(hdmi);
dw_hdmi_update_phy_mask(hdmi);
handle_plugged_change(hdmi, true);
mutex_unlock(&hdmi->mutex);
@@ -3073,7 +3045,6 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense)
if (hpd)
hdmi->rxsense = true;
- dw_hdmi_update_power(hdmi);
dw_hdmi_update_phy_mask(hdmi);
}
mutex_unlock(&hdmi->mutex);
