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Date: Sun, 9 Oct 2022 19:49:00 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Lucas Stach <l.stach@...gutronix.de>, Neil Armstrong <narmstrong@...libre.com>, Robert Foss <robert.foss@...aro.org>, Sasha Levin <sashal@...nel.org>, andrzej.hajda@...el.com, neil.armstrong@...aro.org, airlied@...il.com, daniel@...ll.ch, Sandor.yu@....com, ville.syrjala@...ux.intel.com, tzimmermann@...e.de, maxime@...no.tech, dri-devel@...ts.freedesktop.org Subject: [PATCH AUTOSEL 6.0 12/44] drm: bridge: dw_hdmi: only trigger hotplug event on link change From: Lucas Stach <l.stach@...gutronix.de> [ 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@...gutronix.de> Reviewed-by: Neil Armstrong <narmstrong@...libre.com> (v1) Reviewed-by: Robert Foss <robert.foss@...aro.org> Signed-off-by: Robert Foss <robert.foss@...aro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20220826185733.3213248-1-l.stach@pengutronix.de Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index 25a60eb4d67c..40d8ca37f5bc 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -3096,6 +3096,7 @@ 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); @@ -3134,13 +3135,15 @@ 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 (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 (phy_stat & HDMI_PHY_HPD) + status = connector_status_connected; + + if (!(phy_stat & (HDMI_PHY_HPD | HDMI_PHY_RX_SENSE))) + status = connector_status_disconnected; + } + if (status != connector_status_unknown) { dev_dbg(hdmi->dev, "EVENT=%s\n", status == connector_status_connected ? "plugin" : "plugout"); -- 2.35.1
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