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drm: bridge: dw_hdmi: only trigger hotplug event on link change

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[ Upstream commit da09daf881082266e4075657fac53c7966de8e4d ]

There are two events that signal a real change of the link state: HPD going
high means the sink is newly connected or wants the source to re-read the
EDID, RX sense going low is a indication that the link has been disconnected.

Ignore the other two events that also trigger interrupts, but don't need
immediate attention: HPD going low does not necessarily mean the link has
been lost and should not trigger a immediate read of the status. RX sense
going high also does not require a detect cycle, as HPD going high is the
right point in time to read the EDID.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> (v1)
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220826185733.3213248-1-l.stach@pengutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lucas Stach 2022-08-26 20:57:33 +02:00 committed by Greg Kroah-Hartman
parent bbe2f6f903
commit b70f8abc1a
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
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@ -2984,6 +2984,7 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
{
struct dw_hdmi *hdmi = dev_id;
u8 intr_stat, phy_int_pol, phy_pol_mask, phy_stat;
enum drm_connector_status status = connector_status_unknown;
intr_stat = hdmi_readb(hdmi, HDMI_IH_PHY_STAT0);
phy_int_pol = hdmi_readb(hdmi, HDMI_PHY_POL0);
@ -3022,13 +3023,15 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
cec_notifier_phys_addr_invalidate(hdmi->cec_notifier);
mutex_unlock(&hdmi->cec_notifier_mutex);
}
if (phy_stat & HDMI_PHY_HPD)
status = connector_status_connected;
if (!(phy_stat & (HDMI_PHY_HPD | HDMI_PHY_RX_SENSE)))
status = connector_status_disconnected;
}
if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
enum drm_connector_status status = phy_int_pol & HDMI_PHY_HPD
? connector_status_connected
: connector_status_disconnected;
if (status != connector_status_unknown) {
dev_dbg(hdmi->dev, "EVENT=%s\n",
status == connector_status_connected ?
"plugin" : "plugout");