Re: [PATCH 4.4 038/134] ARM: DRA7: hwmod_data: Prevent wait_target_disable error for usb_otg_ss

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On 20/03/18 01:52, Dan Rue wrote:
On Mon, Mar 19, 2018 at 07:05:21PM +0100, Greg Kroah-Hartman wrote:
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roger Quadros <rogerq@xxxxxx>


[ Upstream commit e2d54fe76997301b49311bde7ba8ef52b47896f9 ]

It seems that if L3_INIT clkdomain is kept in HW_AUTO while usb_otg_ss
is in use then there are random chances that the usb_otg_ss module
will fail to completely idle. i.e. IDLEST = 0x2 instead of 0x3.

Preventing L3_INIT from HW_AUTO while usb_otg_ss module is in use
fixes this issue.

We don't know yet if usb_otg_ss instances 3 and 4 are affected by this
issue or not so don't add this flag for those instances.

Cc: Tero Kristo <t-kristo@xxxxxx>
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

This fails to build for me on arm32 with default config.

#
# make -j10 -k -s ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=build-arm multi_v7_defconfig
#
#
# make -j10 -k -s ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=build-arm
#
../arch/arm/mach-omap2/omap_hwmod_7xx_data.c:2243:12: error: 'HWMOD_CLKDM_NOAUTO' undeclared here (not in a function)
   .flags  = HWMOD_CLKDM_NOAUTO,
             ^
../scripts/Makefile.build:269: recipe for target 'arch/arm/mach-omap2/omap_hwmod_7xx_data.o' failed
make[2]: *** [arch/arm/mach-omap2/omap_hwmod_7xx_data.o] Error 1
make[2]: Target '__build' not remade because of errors.
/home/buildslave/workspace/kernel-single-defconfig-builder/defconfig/multi_v7_defconfig/label/builder/Makefile:969: recipe for target 'arch/arm/mach-omap2' failed
make[1]: *** [arch/arm/mach-omap2] Error 2
make[1]: Target '_all' not remade because of errors.
Makefile:152: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
make: Target '_all' not remade because of errors.

This again has some dependencies, at least:

8ff42da41147 ("ARM: OMAP2+ hwmod: Allow modules to disable HW_AUTO")

-Tero


Dan

---
  arch/arm/mach-omap2/omap_hwmod_7xx_data.c |    2 ++
  1 file changed, 2 insertions(+)

--- a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
@@ -2240,6 +2240,7 @@ static struct omap_hwmod dra7xx_usb_otg_
  	.class		= &dra7xx_usb_otg_ss_hwmod_class,
  	.clkdm_name	= "l3init_clkdm",
  	.main_clk	= "dpll_core_h13x2_ck",
+	.flags		= HWMOD_CLKDM_NOAUTO,
  	.prcm = {
  		.omap4 = {
  			.clkctrl_offs = DRA7XX_CM_L3INIT_USB_OTG_SS1_CLKCTRL_OFFSET,
@@ -2261,6 +2262,7 @@ static struct omap_hwmod dra7xx_usb_otg_
  	.class		= &dra7xx_usb_otg_ss_hwmod_class,
  	.clkdm_name	= "l3init_clkdm",
  	.main_clk	= "dpll_core_h13x2_ck",
+	.flags		= HWMOD_CLKDM_NOAUTO,
  	.prcm = {
  		.omap4 = {
  			.clkctrl_offs = DRA7XX_CM_L3INIT_USB_OTG_SS2_CLKCTRL_OFFSET,



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