Re: [PATCH v4 00/22] Support qcom's HSIC USB and rewrite USB2 HS support

[Stephen Boyd <stephen.boyd@linaro.org>]

Quoting Peter Chen (2016-09-07 19:06:45)
> On Thu, Sep 8, 2016 at 5:34 AM, Stephen Boyd <stephen.boyd@linaro.org> wrote:
> > The state of USB ChipIdea support on Qualcomm's platforms is not great.
> > The DT description of these devices requires up to three different nodes
> > for what amounts to be the same hardware block, when there should really
> > only be one. Furthermore, the "phy" driver that is in mainline (phy-msm-usb.c)
> > duplicates the OTG state machine and touches the ci controller wrapper
> > registers when it should really be focused on the phy and the ULPI accesses
> > needed to get the phy working. There's also a slimmed down phy driver for
> > the msm8916 platform, but really the phy hardware is the same as other MSMs,
> > so we have two drivers doing pretty much the same thing. This leads to a
> > situtaion where we have the chipidea core driver, the "phy" driver, and
> > sometimes the ehci-msm.c driver operating the same device all at the same
> > time with very little coordination. This just isn't very safe and is
> > confusing from a driver perspective when trying to figure out who does what.
> > Finally, there isn't any HSIC support on platforms like apq8074 so we
> > should add that.
> >
> > This patch series updates the ChipIdea driver and the MSM wrapper
> > (ci_hdrc_msm.c) to properly handle the PHY and wrapper bits at the right
> > times in the right places. To get there, we update the ChipIdea core to
> > have support for the ULPI phy bus introduced by Heikki. Along the way
> > we fix bugs with the extcon handling for peripheral and OTG mode controllers
> > and move the parts of phy-usb-msm.c that are touching the CI controller
> > wrapper into the wrapper driver (ci_hdrc_msm.c). Finally we add support
> > for the HSIC phy based on the ULPI bus and rewrite the HS phy driver
> > (phy-usb-msm.c) as a standard ULPI phy driver.
> >
> > Once this series is accepted, we should be able to delete the phy-usb-msm.c,
> > phy-qcom-8x16-usb.c, and ehci-msm.c drivers from the tree and use the ULPI
> > based phy driver (which also lives in drivers/phy/ instead of drivers/usb/phy/)
> > and the chipidea host core instead.
> >
> > I've also sent separate patches for other minor pieces to make this
> > all work. The full tree can be found here[3], hacks and all to get
> > things working. I've tested this on the db410c, apq8074 dragonboard,
> > and ifc6410 with configfs gadgets and otg cables.
> >
> > Patches based on v4.8-rc1
> >
> > Changes from v3:
> >
> >  * Picked up Acks from Peter
> >
> >  * Updated extcon consolidation patch per Peter's comments
> >
> >  * Folded in simplification from Heikki for ULPI DT matching
> >
> 
> I find the kbuild dependency error when compile your series, I remembered
> someone met it before, would you have a solution:

Yes. Should I send it through the drm maintainers?

---8<---
From: Stephen Boyd <stephen.boyd@linaro.org>
Subject: [PATCH] gpu: Remove depends on RESET_CONTROLLER when not a provider

These GPU drivers only depend on the RESET_CONTROLLER config
option to fix build issues that existed when there weren't stub
reset APIs for reset controller consumers. Given that these
drivers aren't providing any reset controllers themselves, they
don't actually depend on the API to build (just to function) so
they don't need to depend on it. Remove the dependency to fix
recursive build errors like the following:

drivers/usb/Kconfig:39:error: recursive dependency detected!
drivers/usb/Kconfig:39: symbol USB is selected by MOUSE_APPLETOUCH
drivers/input/mouse/Kconfig:187:        symbol MOUSE_APPLETOUCH depends on INPUT
drivers/input/Kconfig:8:        symbol INPUT is selected by VT
drivers/tty/Kconfig:12: symbol VT is selected by FB_STI
drivers/video/fbdev/Kconfig:674:        symbol FB_STI depends on FB
drivers/video/fbdev/Kconfig:5:  symbol FB is selected by DRM_KMS_FB_HELPER
drivers/gpu/drm/Kconfig:42:     symbol DRM_KMS_FB_HELPER is selected by DRM_KMS_CMA_HELPER
drivers/gpu/drm/Kconfig:98:     symbol DRM_KMS_CMA_HELPER is selected by DRM_IMX
drivers/gpu/drm/imx/Kconfig:1:  symbol DRM_IMX depends on IMX_IPUV3_CORE
drivers/gpu/ipu-v3/Kconfig:1:   symbol IMX_IPUV3_CORE depends on RESET_CONTROLLER
drivers/reset/Kconfig:4:        symbol RESET_CONTROLLER is selected by USB_CHIPIDEA
drivers/usb/chipidea/Kconfig:1: symbol USB_CHIPIDEA depends on USB_EHCI_HCD
drivers/usb/host/Kconfig:84:    symbol USB_EHCI_HCD depends on USB

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Airlie <airlied@linux.ie>
Cc: <dri-devel@lists.freedesktop.org>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
---
 drivers/gpu/drm/rockchip/Kconfig | 1 -
 drivers/gpu/drm/tegra/Kconfig    | 1 -
 drivers/gpu/ipu-v3/Kconfig       | 1 -
 3 files changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
index 3c58669a06ce..6f7f9c59f05b 100644
--- a/drivers/gpu/drm/rockchip/Kconfig
+++ b/drivers/gpu/drm/rockchip/Kconfig
@@ -1,7 +1,6 @@
 config DRM_ROCKCHIP
 	tristate "DRM Support for Rockchip"
 	depends on DRM && ROCKCHIP_IOMMU
-	depends on RESET_CONTROLLER
 	select DRM_GEM_CMA_HELPER
 	select DRM_KMS_HELPER
 	select DRM_PANEL
diff --git a/drivers/gpu/drm/tegra/Kconfig b/drivers/gpu/drm/tegra/Kconfig
index 63ebb154b9b5..bbf5a4b7e0b6 100644
--- a/drivers/gpu/drm/tegra/Kconfig
+++ b/drivers/gpu/drm/tegra/Kconfig
@@ -3,7 +3,6 @@ config DRM_TEGRA
 	depends on ARCH_TEGRA || (ARM && COMPILE_TEST)
 	depends on COMMON_CLK
 	depends on DRM
-	depends on RESET_CONTROLLER
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL
diff --git a/drivers/gpu/ipu-v3/Kconfig b/drivers/gpu/ipu-v3/Kconfig
index aefdff95356d..08766c6e7856 100644
--- a/drivers/gpu/ipu-v3/Kconfig
+++ b/drivers/gpu/ipu-v3/Kconfig
@@ -1,7 +1,6 @@
 config IMX_IPUV3_CORE
 	tristate "IPUv3 core support"
 	depends on SOC_IMX5 || SOC_IMX6Q || ARCH_MULTIPLATFORM
-	depends on RESET_CONTROLLER
 	select GENERIC_IRQ_CHIP
 	help
 	  Choose this if you have a i.MX5/6 system and want to use the Image
-- 
2.9.0.rc2.8.ga28705d