Therefore, 1. If HPD is low (which means plugging out) for longer than 100ms: we need to do de-bouncing (which means we need to wait for 100ms). 2. If HPD low is for less than 100ms: we don't need to care about the de-bouncing. In this patch, we start a 100ms timer and use a need_debounce boolean to implement the feature. Two cases when HPD is high: 1. If the timer is expired (>100ms): - need_debounce is true. - When HPD high (plugging event comes), need_debounce will be true and then we need to do de-bouncing (wait for 100ms). 2. If the timer is not expired (<100ms): - need_debounce is false. - When HPD high (plugging event comes), need_debounce will be false and no need to do de-bouncing. HPD_______ __________________ | |<- 100ms -> |____________| <- 100ms -> Without HPD de-bouncing, USB-C to HDMI Adapaters will not be detected. The change has been successfully tested with the following devices: - Dell Adapter - USB-C to HDMI - Acer 1in1 HDMI dongle - Ugreen 1in1 HDMI dongle - innowatt HDMI + USB3 hub - Acer 2in1 HDMI dongle - Apple 3in1 HDMI dongle (A2119) - J5Create 3in1 HDMI dongle (JAC379) Tested-by: Rex-BC Chen <rex-bc.chen@xxxxxxxxxxxx> Reviewed-by: Rex-BC Chen <rex-bc.chen@xxxxxxxxxxxx> Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx> Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx> --- drivers/gpu/drm/mediatek/mtk_dp.c | 46 +++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c index d9606c743a9e..4981a3a3b9ca 100644 --- a/drivers/gpu/drm/mediatek/mtk_dp.c +++ b/drivers/gpu/drm/mediatek/mtk_dp.c @@ -174,6 +174,33 @@ struct mtk_dp { struct device *codec_dev; u8 connector_eld[MAX_ELD_BYTES]; struct drm_connector *conn; + bool need_debounce; + struct timer_list debounce_timer; +}; + +enum mtk_dp_sdp_type { + MTK_DP_SDP_NONE = 0x00, + MTK_DP_SDP_ACM = 0x01, + MTK_DP_SDP_ISRC = 0x02, + MTK_DP_SDP_AVI = 0x03, + MTK_DP_SDP_AUI = 0x04, + MTK_DP_SDP_SPD = 0x05, + MTK_DP_SDP_MPEG = 0x06, + MTK_DP_SDP_NTSC = 0x07, + MTK_DP_SDP_VSP = 0x08, + MTK_DP_SDP_VSC = 0x09, + MTK_DP_SDP_EXT = 0x0A, + MTK_DP_SDP_PPS0 = 0x0B, + MTK_DP_SDP_PPS1 = 0x0C, + MTK_DP_SDP_PPS2 = 0x0D, + MTK_DP_SDP_PPS3 = 0x0E, + MTK_DP_SDP_DRM = 0x10, + MTK_DP_SDP_MAX_NUM +}; + +struct mtk_dp_sdp_packet { + enum mtk_dp_sdp_type type; + struct dp_sdp sdp; }; static bool mtk_dp_is_edp(struct mtk_dp *mtk_dp) @@ -1814,6 +1841,9 @@ static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev) if (event < 0) return IRQ_HANDLED; + if (mtk_dp->need_debounce && mtk_dp->train_info.cable_plugged_in) + msleep(100); + if (mtk_dp->drm_dev) { dev_info(mtk_dp->dev, "drm_helper_hpd_irq_event\n"); drm_helper_hpd_irq_event(mtk_dp->bridge.dev); @@ -1892,6 +1922,11 @@ static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk_dp *mtk_dp) } train_info->cable_state_change = true; + if (!train_info->cable_plugged_in) { + mod_timer(&mtk_dp->debounce_timer, jiffies + msecs_to_jiffies(100) - 1); + mtk_dp->need_debounce = false; + } + return IRQ_WAKE_THREAD; } @@ -2339,6 +2374,13 @@ static const struct drm_bridge_funcs mtk_dp_bridge_funcs = { .detect = mtk_dp_bdg_detect, }; +static void mtk_dp_debounce_timer(struct timer_list *t) +{ + struct mtk_dp *mtk_dp = from_timer(mtk_dp, t, debounce_timer); + + mtk_dp->need_debounce = true; +} + static int mtk_dp_probe(struct platform_device *pdev) { struct mtk_dp *mtk_dp; @@ -2396,6 +2438,9 @@ static int mtk_dp_probe(struct platform_device *pdev) mtk_dp->bridge.of_node = dev->of_node; mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP; + mtk_dp->need_debounce = true; + timer_setup(&mtk_dp->debounce_timer, mtk_dp_debounce_timer, 0); + mtk_dp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD; drm_bridge_add(&mtk_dp->bridge); @@ -2415,6 +2460,7 @@ static int mtk_dp_remove(struct platform_device *pdev) struct mtk_dp *mtk_dp = platform_get_drvdata(pdev); mtk_dp_video_mute(mtk_dp, true); + del_timer_sync(&mtk_dp->debounce_timer); pm_runtime_disable(&pdev->dev); -- 2.34.1