| Message ID | 1446167355-6387-1-git-send-email-ykk@rock-chips.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Oct 30, 2015 at 09:09:15AM +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. > > Tested-by: Heiko Stuebner <heiko@sntech.de> > Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> > Signed-off-by: Yakir Yang <ykk@rock-chips.com> > --- I didn't find this one in v10. Did it get dropped? > 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. This should be a generic property. Rob
On Thu, Nov 12, 2015 at 09:27:21AM +0800, Yakir Yang wrote: > Hi Rob, > > On 11/12/2015 07:10 AM, Rob Herring wrote: > >On Fri, Oct 30, 2015 at 09:09:15AM +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. > >> > >>Tested-by: Heiko Stuebner <heiko@sntech.de> > >>Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> > >>Signed-off-by: Yakir Yang <ykk@rock-chips.com> > >>--- > >I didn't find this one in v10. Did it get dropped? > > You are in my 'to' list, but I haven't send the whole v10 out, > most of them don't need update :) Okay, it's just gmail's inability to follow threading... > This series should be: > ---- [v8 0/17 ...] > |---- [v8 1/17 ...] > |---- [v8 2/17 ...] > |---- [v8 3/17 ...] > |---- [...] > |---- [v8 15/17 ...] > |---- [v8 16/17 ...] > |---- [v8 17/17 ...] > | > |---- [v9 10/17 ...] > |---- [v9 15/17 ...] > |---- We are here > |---- [v9 09/17 ...] > |---- [v10 09/17 ...] > |---- Received an acked from you > >>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. > >This should be a generic property. > > This property would only need in some no-hpd case, it would be dropped if > panel keep the hotplug signal, that's why I thought it should be optional. I agree it is optional. I just mean drop the analogix and put in a common binding doc (i.e. create a display/bridge/common.txt). Needing to ignore HPD is probably a common problem. > I thought if we put this a property to generic property, then we must need > to define it in normal device node, not sure whether it is right :) Sorry, I don't follow. Rob
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 ec93917..be18388 100644 --- a/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt +++ b/Documentation/devicetree/bindings/display/rockchip/analogix_dp-rockchip.txt @@ -31,6 +31,7 @@ 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 563ffb1d..3842dbd 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; } @@ -1244,6 +1267,9 @@ 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;