Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752695AbbLIBVY (ORCPT ); Tue, 8 Dec 2015 20:21:24 -0500 Received: from lucky1.263xmail.com ([211.157.147.132]:51906 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752594AbbLIBVU (ORCPT ); Tue, 8 Dec 2015 20:21:20 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 X-RL-SENDER: ykk@rock-chips.com X-FST-TO: linux-arm-kernel@lists.infradead.org X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: ykk@rock-chips.com X-UNIQUE-TAG: <5034ad74ab982926fc759447022bde56> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 Subject: Re: [PATCH v10 14/17] drm: bridge: analogix/dp: try force hpd after plug in lookup failed To: Rob Herring References: <1449470239-30667-1-git-send-email-ykk@rock-chips.com> <1449470442-31519-1-git-send-email-ykk@rock-chips.com> <20151208150954.GA17979@rob-hp-laptop> Cc: Inki Dae , Mark Yao , Jingoo Han , Heiko Stuebner , Thierry Reding , Krzysztof Kozlowski , Andrzej Hajda , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Russell King , emil.l.velikov@gmail.com, Gustavo Padovan , Kishon Vijay Abraham I , ajaynumb@gmail.com, javier@osg.samsung.com, Andy Yan , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org From: Yakir Yang Message-ID: <566781FE.80500@rock-chips.com> Date: Wed, 9 Dec 2015 09:21:02 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <20151208150954.GA17979@rob-hp-laptop> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7966 Lines: 200 Hi Rob, Thanks for your respond. On 12/08/2015 11:09 PM, Rob Herring wrote: > On Mon, Dec 07, 2015 at 02:40:42PM +0800, Yakir Yang wrote: >> Some edp screen do not have hpd signal, so we can't just return >> failed when hpd plug in detect failed. >> >> This is an hardware property, so we need add a devicetree property >> "analogix,need-force-hpd" to indicate this sutiation. > I can see this being common. Just make it "force-hpd". Okay, I would send the v10.1 out. - Yakir > Rob > >> Signed-off-by: Yakir Yang >> Tested-by: Javier Martinez Canillas >> --- >> Changes in v10: None >> Changes in v9: None >> Changes in v8: None >> Changes in v7: None >> Changes in v6: None >> Changes in v5: None >> Changes in v4: None >> Changes in v3: >> - Add "analogix,need-force-hpd" to indicate whether driver need foce >> hpd when hpd detect failed. >> >> Changes in v2: None >> >> .../bindings/display/bridge/analogix_dp.txt | 4 ++- >> .../bindings/display/exynos/exynos_dp.txt | 1 + >> .../display/rockchip/analogix_dp-rockchip.txt | 1 + >> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 36 +++++++++++++++++++--- >> drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 2 ++ >> drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 9 ++++++ >> 6 files changed, 47 insertions(+), 6 deletions(-) >> >> diff --git a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt b/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt >> index 7659a7a..74f0e80 100644 >> --- a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt >> +++ b/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt >> @@ -22,6 +22,9 @@ Required properties for dp-controller: >> from general PHY binding: Should be "dp". >> >> Optional properties for dp-controller: >> + -analogix,need-force-hpd: >> + Indicate driver need force hpd when hpd detect failed, this >> + is used for some eDP screen which don't have hpd signal. >> -hpd-gpios: >> Hotplug detect GPIO. >> Indicates which GPIO should be used for hotplug detection >> @@ -31,7 +34,6 @@ Optional properties for dp-controller: >> * Documentation/devicetree/bindings/display/exynos/exynos_dp.txt >> * Documentation/devicetree/bindings/video/analogix_dp-rockchip.txt >> >> - >> [1]: Documentation/devicetree/bindings/media/video-interfaces.txt >> ------------------------------------------------------------------------------- >> >> diff --git a/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt b/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt >> index 9905081..8800164 100644 >> --- a/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt >> +++ b/Documentation/devicetree/bindings/display/exynos/exynos_dp.txt >> @@ -41,6 +41,7 @@ For the below properties, please refer to Analogix DP binding document: >> -phys (required) >> -phy-names (required) >> -hpd-gpios (optional) >> + -analogix,need-force-hpd (optional) >> -video interfaces (optional) >> >> Deprecated properties for DisplayPort: >> diff --git a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt >> index dae86c4..1f1e594 100644 >> --- a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt >> +++ b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt >> @@ -32,6 +32,7 @@ For the below properties, please refer to Analogix DP binding document: >> - phys (required) >> - phy-names (required) >> - hpd-gpios (optional) >> +- analogix,need-force-hpd (optional) >> ------------------------------------------------------------------------------- >> >> Example: >> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c >> index a11504b..94968e4 100644 >> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c >> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c >> @@ -59,15 +59,38 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp) >> { >> int timeout_loop = 0; >> >> - while (analogix_dp_get_plug_in_status(dp) != 0) { >> + while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) { >> + if (analogix_dp_get_plug_in_status(dp) == 0) >> + return 0; >> + >> timeout_loop++; >> - if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) { >> - dev_err(dp->dev, "failed to get hpd plug status\n"); >> - return -ETIMEDOUT; >> - } >> usleep_range(10, 11); >> } >> >> + /* >> + * Some edp screen do not have hpd signal, so we can't just >> + * return failed when hpd plug in detect failed, DT property >> + * "need-force-hpd" would indicate whether driver need this. >> + */ >> + if (!dp->need_force_hpd) >> + return -ETIMEDOUT; >> + >> + /* >> + * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH >> + * will not work, so we need to give a force hpd action to >> + * set HPD_STATUS manually. >> + */ >> + dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n"); >> + >> + analogix_dp_force_hpd(dp); >> + >> + if (analogix_dp_get_plug_in_status(dp) != 0) { >> + dev_err(dp->dev, "failed to get hpd plug in status\n"); >> + return -EINVAL; >> + } >> + >> + dev_dbg(dp->dev, "success to get plug in status after force hpd\n"); >> + >> return 0; >> } >> >> @@ -1246,6 +1269,9 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev, >> if (IS_ERR(dp->reg_base)) >> return PTR_ERR(dp->reg_base); >> >> + dp->need_force_hpd = >> + of_property_read_bool(dev->of_node, "analogix,need-force-hpd"); >> + >> dp->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0); >> if (!gpio_is_valid(dp->hpd_gpio)) >> dp->hpd_gpio = of_get_named_gpio(dev->of_node, >> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h >> index e6f8243..d3c7e0a 100644 >> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h >> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h >> @@ -160,6 +160,7 @@ struct analogix_dp_device { >> struct phy *phy; >> int dpms_mode; >> int hpd_gpio; >> + bool need_force_hpd; >> >> struct analogix_dp_plat_data *plat_data; >> }; >> @@ -180,6 +181,7 @@ void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp, >> bool enable); >> void analogix_dp_init_analog_func(struct analogix_dp_device *dp); >> void analogix_dp_init_hpd(struct analogix_dp_device *dp); >> +void analogix_dp_force_hpd(struct analogix_dp_device *dp); >> enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp); >> void analogix_dp_clear_hotplug_interrupts(struct analogix_dp_device *dp); >> void analogix_dp_reset_aux(struct analogix_dp_device *dp); >> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c >> index 21a3287..c7e2959 100644 >> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c >> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c >> @@ -365,6 +365,15 @@ void analogix_dp_init_hpd(struct analogix_dp_device *dp) >> writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3); >> } >> >> +void analogix_dp_force_hpd(struct analogix_dp_device *dp) >> +{ >> + u32 reg; >> + >> + reg = readl(dp->reg_base + ANALOGIX_DP_SYS_CTL_3); >> + reg = (F_HPD | HPD_CTRL); >> + writel(reg, dp->reg_base + ANALOGIX_DP_SYS_CTL_3); >> +} >> + >> enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp) >> { >> u32 reg; >> -- >> 1.9.1 >> >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/