lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <1542637950.5139.12.camel@pengutronix.de>
Date:   Mon, 19 Nov 2018 15:32:30 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Fabio Estevam <fabio.estevam@....com>, cphealy@...il.com,
        l.stach@...gutronix.de, Leonard Crestez <leonard.crestez@....com>,
        "A.s. Dong" <aisheng.dong@....com>,
        Richard Zhu <hongxing.zhu@....com>, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] reset: imx7: Add support for i.MX8MQ

Hi Andrey,

thank you for the patch.

In general, sharing the lookup table with i.MX7 is fine iff it is a
strict superset. But I don't think that is the case (see below).
Even so, this will change if there ever is another i.MX7 or i.MX8M
variant that is also a superset of i.MX7, but not a superset of
i.MX8M. Also, just listing all resets in order of appearance would make
review a bit easier.

I don't like increasing IMX7_RESET_NUM though, i.MX8M should have its
own nr_resets.

On Sat, 2018-11-17 at 10:11 -0800, Andrey Smirnov wrote:
> SRC IP block used in i.MX8MQ is a superset of what is found in i.MX7D,

Is this true, though?

i.MX7 has SRC_ERCR at offset 0x14 and HSICPHY_RCR at offset 0x1c.
According to documentation, i.MX8M is missing those at least.

> so add all of the definitions necessary to support both.
>
> Cc: p.zabel@...gutronix.de
> Cc: Fabio Estevam <fabio.estevam@....com>
> Cc: cphealy@...il.com
> Cc: l.stach@...gutronix.de
> Cc: Leonard Crestez <leonard.crestez@....com>
> Cc: "A.s. Dong" <aisheng.dong@....com>
> Cc: Richard Zhu <hongxing.zhu@....com>
> Cc: linux-imx@....com
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> ---
>  drivers/reset/Kconfig                   |  2 +-
>  drivers/reset/reset-imx7.c              | 66 ++++++++++++++++++++++++-
>  include/dt-bindings/reset/imx7-reset.h  | 15 +++++-
>  include/dt-bindings/reset/imx8m-reset.h | 47 ++++++++++++++++++
>  4 files changed, 127 insertions(+), 3 deletions(-)
>  create mode 100644 include/dt-bindings/reset/imx8m-reset.h
> 
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index c21da9fe51ec..4909aab7401b 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -50,7 +50,7 @@ config RESET_HSDK
>  config RESET_IMX7
>  	bool "i.MX7 Reset Driver" if COMPILE_TEST
>  	depends on HAS_IOMEM
> -	default SOC_IMX7D
> +	default SOC_IMX7D || SOC_IMX8MQ
>  	select MFD_SYSCON
>  	help
>  	  This enables the reset controller driver for i.MX7 SoCs.
> diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
> index 77911fa8f31d..dffad618f805 100644
> --- a/drivers/reset/reset-imx7.c
> +++ b/drivers/reset/reset-imx7.c
> @@ -21,14 +21,16 @@
>  #include <linux/reset-controller.h>
>  #include <linux/regmap.h>
>  #include <dt-bindings/reset/imx7-reset.h>
> +#include <dt-bindings/reset/imx8m-reset.h>
>  
>  struct imx7_src {
>  	struct reset_controller_dev rcdev;
>  	struct regmap *regmap;
>  };
>  
> -enum imx7_src_registers {
> +enum imx_src_registers {
>  	SRC_A7RCR0		= 0x0004,
> +	SRC_A53RCR0		= 0x0004,
>  	SRC_M4RCR		= 0x000c,
>  	SRC_ERCR		= 0x0014,
>  	SRC_HSICPHY_RCR		= 0x001c,
> @@ -36,7 +38,9 @@ enum imx7_src_registers {
>  	SRC_USBOPHY2_RCR	= 0x0024,
>  	SRC_MIPIPHY_RCR		= 0x0028,
>  	SRC_PCIEPHY_RCR		= 0x002c,

These aren't complete. I see at least SRC_HDMI_RCR, SRC_DISP_RCR,
SRC_GPU_RCR, and SRC_VPU_RCR missing.

> +	SRC_PCIE2PHY_RCR	= 0x0048,

And SRC_MIPIPHY1_RCR, SRC_MIPIPHY2_RCR. Please check the reference
manual and complete the list of registers that contain resets.

>  	SRC_DDRC_RCR		= 0x1000,
> +

Whitespace.

>  };
>  
>  struct imx7_src_signal {
> @@ -67,11 +71,67 @@ static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
>  	[IMX7_RESET_PCIEPHY]		= { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
>  	[IMX7_RESET_PCIEPHY_PERST]	= { SRC_PCIEPHY_RCR, BIT(3) },
>  	[IMX7_RESET_PCIE_CTRL_APPS_EN]	= { SRC_PCIEPHY_RCR, BIT(6) },
> +	[IMX7_RESET_PCIE_CTRL_APPS_CLK_REQ] = { SRC_PCIEPHY_RCR, BIT(4) },

Now I feel like CTRL_APPS_EN shouldn't have been added here either. But
while there I wasn't really sure about whether that is actually a valid
reset, I'm pretty sure that this one isn't.
I think that i.MX8M either needs a clock driver to control this bit and
the corresponding IOMUXC GPR bit to enable the PCIe refclk, or the PCIe
driver has to access this register via syscon. I really don't want to
see a clock enable signal described in the device tree as a reset.

>  	[IMX7_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
>  	[IMX7_RESET_DDRC_PRST]		= { SRC_DDRC_RCR, BIT(0) },
>  	[IMX7_RESET_DDRC_CORE_RST]	= { SRC_DDRC_RCR, BIT(1) },
> +
> +	[IMX8M_RESET_A53_CORE_POR_RESET2] = { SRC_A53RCR0, BIT(2) },
> +	[IMX8M_RESET_A53_CORE_POR_RESET3] = { SRC_A53RCR0, BIT(3) },
> +	[IMX8M_RESET_A53_CORE_RESET2]     = { SRC_A53RCR0, BIT(6) },
> +	[IMX8M_RESET_A53_CORE_RESET3]     = { SRC_A53RCR0, BIT(7) },

Missing IMX8M_RESET_A53_DBG_RESET2,3.

> +	[IMX8M_RESET_A53_ETM_RESET2]      = { SRC_A53RCR0, BIT(14) },
> +	[IMX8M_RESET_A53_ETM_RESET3]      = { SRC_A53RCR0, BIT(15) },

Missing some reset registers here.

> +	[IMX8M_RESET_PCIE2PHY]		= { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
> +	[IMX8M_RESET_PCIE2PHY_PERST]      = { SRC_PCIE2PHY_RCR, BIT(3) },
> +	[IMX8M_RESET_PCIE2_CTRL_APPS_EN]  = { SRC_PCIE2PHY_RCR, BIT(6) },
> +	[IMX8M_RESET_PCIE2_CTRL_APPS_CLK_REQ] = { SRC_PCIE2PHY_RCR, BIT(4) },

See above.

> +	[IMX8M_RESET_PCIE2_CTRL_APPS_TURNOFF] = { SRC_PCIE2PHY_RCR, BIT(11) },

Missing some reset registers here.

>  };
>  
> +static inline void imx7_src_check_definitions(void)
> +{
> +	BUILD_BUG_ON(IMX8M_RESET_A53_CORE_POR_RESET0 !=
> +		     IMX7_RESET_A7_CORE_POR_RESET0);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_CORE_POR_RESET1 !=
> +		     IMX7_RESET_A7_CORE_POR_RESET1);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_CORE_RESET0 !=
> +		     IMX7_RESET_A7_CORE_RESET0);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_CORE_RESET1 !=
> +		     IMX7_RESET_A7_CORE_RESET1);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_DBG_RESET0 !=
> +		     IMX7_RESET_A7_DBG_RESET0);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_DBG_RESET1 !=
> +		     IMX7_RESET_A7_DBG_RESET1);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_ETM_RESET0 !=
> +		     IMX7_RESET_A7_ETM_RESET0);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_ETM_RESET1 !=
> +		     IMX7_RESET_A7_ETM_RESET1);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_SOC_DBG_RESET !=
> +		     IMX7_RESET_A7_SOC_DBG_RESET);
> +	BUILD_BUG_ON(IMX8M_RESET_A53_L2RESET != IMX7_RESET_A7_L2RESET);
> +	BUILD_BUG_ON(IMX8M_RESET_SW_M4C_RST != IMX7_RESET_SW_M4C_RST);
> +	BUILD_BUG_ON(IMX8M_RESET_SW_M4P_RST != IMX7_RESET_SW_M4P_RST);
> +	BUILD_BUG_ON(IMX8M_RESET_EIM_RST != IMX7_RESET_EIM_RST);
> +	BUILD_BUG_ON(IMX8M_RESET_HSICPHY_PORT_RST !=
> +		     IMX7_RESET_HSICPHY_PORT_RST);
> +	BUILD_BUG_ON(IMX8M_RESET_USBPHY1_POR != IMX7_RESET_USBPHY1_POR);
> +	BUILD_BUG_ON(IMX8M_RESET_USBPHY1_PORT_RST !=
> +		     IMX7_RESET_USBPHY1_PORT_RST);
> +	BUILD_BUG_ON(IMX8M_RESET_USBPHY2_POR != IMX7_RESET_USBPHY2_POR);
> +	BUILD_BUG_ON(IMX8M_RESET_USBPHY2_PORT_RST !=
> +		     IMX7_RESET_USBPHY2_PORT_RST);
> +	BUILD_BUG_ON(IMX8M_RESET_MIPI_PHY_MRST != IMX7_RESET_MIPI_PHY_MRST);
> +	BUILD_BUG_ON(IMX8M_RESET_MIPI_PHY_SRST != IMX7_RESET_MIPI_PHY_SRST);
> +	BUILD_BUG_ON(IMX8M_RESET_PCIEPHY != IMX7_RESET_PCIEPHY);
> +	BUILD_BUG_ON(IMX8M_RESET_PCIE_CTRL_APPS_EN !=
> +		     IMX7_RESET_PCIE_CTRL_APPS_EN);
> +	BUILD_BUG_ON(IMX8M_RESET_PCIE_CTRL_APPS_TURNOFF !=
> +		     IMX7_RESET_PCIE_CTRL_APPS_TURNOFF);
> +	BUILD_BUG_ON(IMX8M_RESET_DDRC_PRST != IMX7_RESET_DDRC_PRST);
> +	BUILD_BUG_ON(IMX8M_RESET_DDRC_CORE_RST != IMX7_RESET_DDRC_CORE_RST);
> +}

This won't be necessary with a separate lookup table.

>  static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
>  {
>  	return container_of(rcdev, struct imx7_src, rcdev);
> @@ -85,6 +145,7 @@ static int imx7_reset_set(struct reset_controller_dev *rcdev,
>  	unsigned int value = assert ? signal->bit : 0;
>  
>  	switch (id) {
> +	case IMX8M_RESET_PCIE2PHY: /* FALLTHROUGH */

I'd prefer lowercase /* fallthrough */.

>  	case IMX7_RESET_PCIEPHY:
>  		/*
>  		 * wait for more than 10us to release phy g_rst and
> @@ -94,6 +155,7 @@ static int imx7_reset_set(struct reset_controller_dev *rcdev,
>  			udelay(10);
>  		break;
>  
> +	case IMX8M_RESET_PCIE2_CTRL_APPS_EN: /* FALLTHROUGH */

And here.

>  	case IMX7_RESET_PCIE_CTRL_APPS_EN:
>  		value = (assert) ? 0 : signal->bit;
>  		break;
> @@ -126,6 +188,8 @@ static int imx7_reset_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct regmap_config config = { .name = "src" };
>  
> +	imx7_src_check_definitions();
> +
>  	imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL);
>  	if (!imx7src)
>  		return -ENOMEM;
> diff --git a/include/dt-bindings/reset/imx7-reset.h b/include/dt-bindings/reset/imx7-reset.h
> index 31b3f87dde9a..8fefd694d481 100644
> --- a/include/dt-bindings/reset/imx7-reset.h
> +++ b/include/dt-bindings/reset/imx7-reset.h
> @@ -57,8 +57,21 @@
>  #define IMX7_RESET_DDRC_CORE_RST	24
>  
>  #define IMX7_RESET_PCIE_CTRL_APPS_TURNOFF 25
> +#define IMX7_RESET_PCIE_CTRL_APPS_CLK_REQ 26

See above.

> -#define IMX7_RESET_NUM			26

Please leave this at 26.

> +#define	IMX8M_RESET_A53_CORE_POR_RESET2	27
> +#define IMX8M_RESET_A53_CORE_POR_RESET3	28
> +#define IMX8M_RESET_A53_CORE_RESET2	29
> +#define	IMX8M_RESET_A53_CORE_RESET3	30
> +#define IMX8M_RESET_A53_ETM_RESET2	31
> +#define IMX8M_RESET_A53_ETM_RESET3	32
> +#define IMX8M_RESET_PCIE2PHY		33
> +#define IMX8M_RESET_PCIE2PHY_PERST	34
> +#define IMX8M_RESET_PCIE2_CTRL_APPS_EN	35
> +#define IMX8M_RESET_PCIE2_CTRL_APPS_CLK_REQ 36

See above.

> +#define IMX8M_RESET_PCIE2_CTRL_APPS_TURNOFF 37

Move these into imx8m-reset.h

> +
> +#define IMX7_RESET_NUM			38

And add a separate IMX8M_RESET_NUM.

> 
>  #endif
>  
> diff --git a/include/dt-bindings/reset/imx8m-reset.h b/include/dt-bindings/reset/imx8m-reset.h
> new file mode 100644
> index 000000000000..8fa840354723
> --- /dev/null
> +++ b/include/dt-bindings/reset/imx8m-reset.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2018 Zodiac Inflight Innovations
> + *
> + * Author: Andrey Smirnov <andrew.smirnov@...il.com>
> + */
> +
> +#ifndef DT_BINDING_RESET_IMX8M_H
> +#define DT_BINDING_RESET_IMX8M_H
> +
> +#include "imx7-reset.h"
> +
> +#define IMX8M_RESET_A53_CORE_POR_RESET0 IMX7_RESET_A7_CORE_POR_RESET0
> +#define IMX8M_RESET_A53_CORE_POR_RESET1 IMX7_RESET_A7_CORE_POR_RESET1
> +
> +#define IMX8M_RESET_A53_CORE_RESET0     IMX7_RESET_A7_CORE_RESET0
> +#define IMX8M_RESET_A53_CORE_RESET1     IMX7_RESET_A7_CORE_RESET1
> +
> +#define IMX8M_RESET_A53_DBG_RESET0	IMX7_RESET_A7_DBG_RESET0
> +#define IMX8M_RESET_A53_DBG_RESET1	IMX7_RESET_A7_DBG_RESET1
> +
> +#define IMX8M_RESET_A53_ETM_RESET0	IMX7_RESET_A7_ETM_RESET0
> +#define IMX8M_RESET_A53_ETM_RESET1	IMX7_RESET_A7_ETM_RESET1
> +
> +#define IMX8M_RESET_A53_SOC_DBG_RESET   IMX7_RESET_A7_SOC_DBG_RESET
> +#define IMX8M_RESET_A53_L2RESET         IMX7_RESET_A7_L2RESET
> +#define IMX8M_RESET_SW_M4C_RST          IMX7_RESET_SW_M4C_RST
> +#define IMX8M_RESET_SW_M4P_RST          IMX7_RESET_SW_M4P_RST

> +#define IMX8M_RESET_EIM_RST             IMX7_RESET_EIM_RST
> +#define IMX8M_RESET_HSICPHY_PORT_RST    IMX7_RESET_HSICPHY_PORT_RST

These two don't exist according to the reference manual.

> +#define IMX8M_RESET_USBPHY1_POR         IMX7_RESET_USBPHY1_POR
> +#define IMX8M_RESET_USBPHY1_PORT_RST    IMX7_RESET_USBPHY1_PORT_RST

These two don't seem to exist either. I only see a single OTG1_PHY_RESET
bit in that register.

> +#define IMX8M_RESET_USBPHY2_POR         IMX7_RESET_USBPHY2_POR
> +#define IMX8M_RESET_USBPHY2_PORT_RST    IMX7_RESET_USBPHY2_PORT_RST

Same here.

> +#define IMX8M_RESET_MIPI_PHY_MRST       IMX7_RESET_MIPI_PHY_MRST
> +#define IMX8M_RESET_MIPI_PHY_SRST       IMX7_RESET_MIPI_PHY_SRST

These don't exist either. The MIPIPHY_RCR register instead has 5
different _RESET_N bits.

> +#define IMX8M_RESET_PCIEPHY             IMX7_RESET_PCIEPHY
> +#define IMX8M_RESET_PCIEPHY_PERST	IMX7_RESET_PCIEPHY_PERST
> +#define IMX8M_RESET_PCIE_CTRL_APPS_EN   IMX7_RESET_PCIE_CTRL_APPS_EN
> +#define IMX8M_RESET_DDRC_PRST           IMX7_RESET_DDRC_PRST
> +#define IMX8M_RESET_DDRC_CORE_RST       IMX7_RESET_DDRC_CORE_RST
> +
> +#define IMX8M_RESET_PCIE_CTRL_APPS_TURNOFF IMX7_RESET_PCIE_CTRL_APPS_TURNOFF
> +#define IMX8M_RESET_PCIE_CTRL_APPS_CLK_REQ IMX7_RESET_PCIE_CTRL_APPS_CLK_REQ
> +
> +#endif


regards
Philipp

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ