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[2a02:8440:6241:3b28:3074:96af:9642:2]) by smtp.gmail.com with ESMTPSA id b10sm47431454wrd.8.2022.02.18.06.56.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Feb 2022 06:56:34 -0800 (PST) From: Guillaume Ranquet To: chunkuang.hu@kernel.org, p.zabel@pengutronix.de, airlied@linux.ie, daniel@ffwll.ch, robh+dt@kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, matthias.bgg@gmail.com, chunfeng.yun@mediatek.com, kishon@ti.com, vkoul@kernel.org, deller@gmx.de, ck.hu@mediatek.com, jitao.shi@mediatek.com, angelogioacchino.delregno@collabora.com Cc: dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-phy@lists.infradead.org, linux-fbdev@vger.kernel.org Subject: [PATCH v8 17/19] drm/mediatek: add hpd debounce Date: Fri, 18 Feb 2022 15:54:35 +0100 Message-Id: <20220218145437.18563-18-granquet@baylibre.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220218145437.18563-1-granquet@baylibre.com> References: <20220218145437.18563-1-granquet@baylibre.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Jitao Shi Implement the DP HDP debounce described in DP 1.4a 3.3. Signed-off-by: Jitao Shi Signed-off-by: Guillaume Ranquet Reviewed-by: Rex-BC Chen Tested-by: Rex-BC Chen --- drivers/gpu/drm/mediatek/mtk_dp.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/m= tk_dp.c index 2a3d5f15b651b..fe91ab8b2fd89 100644 --- a/drivers/gpu/drm/mediatek/mtk_dp.c +++ b/drivers/gpu/drm/mediatek/mtk_dp.c @@ -178,6 +178,8 @@ 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; }; =20 static struct regmap_config mtk_dp_regmap_config =3D { @@ -1698,6 +1700,9 @@ static irqreturn_t mtk_dp_hpd_event_thread(int hpd, v= oid *dev) if (event < 0) return IRQ_HANDLED; =20 + 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); @@ -1776,6 +1781,13 @@ static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk= _dp *mtk_dp) } train_info->cable_state_change =3D true; =20 + if (train_info->cable_state_change) { + if (!train_info->cable_plugged_in) { + mod_timer(&mtk_dp->debounce_timer, jiffies + msecs_to_jiffies(100) - 1); + mtk_dp->need_debounce =3D false; + } + } + return IRQ_WAKE_THREAD; } =20 @@ -2239,6 +2251,13 @@ static const struct drm_bridge_funcs mtk_dp_bridge_f= uncs =3D { .detect =3D mtk_dp_bdg_detect, }; =20 +static void mtk_dp_debounce_timer(struct timer_list *t) +{ + struct mtk_dp *mtk_dp =3D from_timer(mtk_dp, t, debounce_timer); + + mtk_dp->need_debounce =3D true; +} + static int mtk_dp_probe(struct platform_device *pdev) { struct mtk_dp *mtk_dp; @@ -2319,6 +2338,9 @@ static int mtk_dp_probe(struct platform_device *pdev) else mtk_dp->bridge.type =3D DRM_MODE_CONNECTOR_DisplayPort; =20 + mtk_dp->need_debounce =3D true; + timer_setup(&mtk_dp->debounce_timer, mtk_dp_debounce_timer, 0); + pm_runtime_enable(dev); pm_runtime_get_sync(dev); =20 @@ -2332,6 +2354,7 @@ static int mtk_dp_remove(struct platform_device *pdev) platform_device_unregister(mtk_dp->phy_dev); =20 mtk_dp_video_mute(mtk_dp, true); + del_timer_sync(&mtk_dp->debounce_timer); =20 pm_runtime_disable(&pdev->dev); =20 --=20 2.34.1