| Message ID | 1449470442-31519-1-git-send-email-ykk@rock-chips.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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". Rob > > Signed-off-by: Yakir Yang <ykk@rock-chips.com> > Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> > --- > 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-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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 <ykk@rock-chips.com> >> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> >> --- >> 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-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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;