linux-kernel - [PATCH 3.18 22/68] ARM: DRA7: hwmod_data: Prevent wait_target_disable error for usb_otg

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Date:   Mon, 19 Mar 2018 19:06:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tero Kristo <t-kristo@...com>,
        Roger Quadros <rogerq@...com>,
        Tony Lindgren <tony@...mide.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 22/68] ARM: DRA7: hwmod_data: Prevent wait_target_disable error for usb_otg_ss

3.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Roger Quadros <rogerq@...com>


[ 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@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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
@@ -2106,6 +2106,7 @@ 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,
@@ -2127,6 +2128,7 @@ 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,