[U-Boot] [PATCH v3 1/8] armv8: Add workaround for USB erratum A-009008

[Marek Vasut]

On 08/17/2017 09:31 AM, Ran Wang wrote:
> USB High Speed (HS) EYE Height Adjustment
> USB HS speed eye diagram fails with the default value at
> many corners, particularly at a high temperature
> 
> Optimal eye at TXREFTUNE value to 1001 is observed, change
> set the same value.
> 
> Signed-off-by: Ran Wang <ran.wang_1 at nxp.com>
> ---
> Change in v3:
> 	Use inline function to make code cleaner.
> 
> Change in v2:
> 	In function erratum_a009008():
> 	1.Put a blank line after variable declaration.
> 	2.Move common code together.
> 
>  arch/arm/cpu/armv8/fsl-layerscape/Kconfig          |  7 ++++++
>  arch/arm/cpu/armv8/fsl-layerscape/soc.c            | 25 ++++++++++++++++++++++
>  .../include/asm/arch-fsl-layerscape/immap_lsch2.h  |  6 ++++++
>  .../include/asm/arch-fsl-layerscape/immap_lsch3.h  |  1 +
>  4 files changed, 39 insertions(+)
> 
> diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
> index 5825f9b..300f5ce 100644
> --- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
> +++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
> @@ -22,6 +22,7 @@ config ARCH_LS1043A
>  	select SYS_FSL_ERRATUM_A009942
>  	select SYS_FSL_ERRATUM_A010315
>  	select SYS_FSL_ERRATUM_A010539
> +	select SYS_FSL_ERRATUM_A009008
>  	select SYS_FSL_HAS_DDR3
>  	select SYS_FSL_HAS_DDR4
>  	select ARCH_EARLY_INIT_R
> @@ -43,6 +44,7 @@ config ARCH_LS1046A
>  	select SYS_FSL_ERRATUM_A009942
>  	select SYS_FSL_ERRATUM_A010165
>  	select SYS_FSL_ERRATUM_A010539
> +	select SYS_FSL_ERRATUM_A009008
>  	select SYS_FSL_HAS_DDR4
>  	select SYS_FSL_SRDS_2
>  	select ARCH_EARLY_INIT_R
> @@ -79,6 +81,7 @@ config ARCH_LS2080A
>  	select SYS_FSL_ERRATUM_A009942
>  	select SYS_FSL_ERRATUM_A010165
>  	select SYS_FSL_ERRATUM_A009203
> +	select SYS_FSL_ERRATUM_A009008
>  	select ARCH_EARLY_INIT_R
>  	select BOARD_EARLY_INIT_F
>  
> @@ -222,6 +225,10 @@ config SYS_FSL_ERRATUM_A010315
>  config SYS_FSL_ERRATUM_A010539
>  	bool "Workaround for PIN MUX erratum A010539"
>  
> +config SYS_FSL_ERRATUM_A009008
> +	bool "Workaround for USB PHY erratum A009008"
> +
> +
>  config MAX_CPUS
>  	int "Maximum number of CPUs permitted for Layerscape"
>  	default 4 if ARCH_LS1043A
> diff --git a/arch/arm/cpu/armv8/fsl-layerscape/soc.c b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
> index aee1ffa..7e5288b 100644
> --- a/arch/arm/cpu/armv8/fsl-layerscape/soc.c
> +++ b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
> @@ -52,6 +52,29 @@ bool soc_has_aiop(void)
>  	return false;
>  }
>  
> +static inline void set_usb_txvreftune(u32 __iomem *scfg, u32 offset)

Drop the inline.

> +{
> +	u32 val;
> +
> +	val = scfg_in32(scfg + offset / 4) & ~(0xF << 6);
> +	val |= USB_TXVREFTUNE << 6;
> +	scfg_out32(scfg + offset / 4, val);

clrsetbits_le32() or something ? Clean up the math a little.

> +}
> +
> +static void erratum_a009008(void)
> +{
> +#ifdef CONFIG_SYS_FSL_ERRATUM_A009008
> +	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
> +#if defined(CONFIG_ARCH_LS1043A) || defined(CONFIG_ARCH_LS1046A)
> +	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB1);
> +	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB2);
> +	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB3);
> +#elif defined(CONFIG_ARCH_LS2080A)
> +	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR);
> +#endif
> +#endif /* CONFIG_SYS_FSL_ERRATUM_A009008 */
> +}
> +
>  #if defined(CONFIG_FSL_LSCH3)
>  /*
>   * This erratum requires setting a value to eddrtqcr1 to
> @@ -198,6 +221,7 @@ void fsl_lsch3_early_init_f(void)
>  #endif
>  	erratum_a008514();
>  	erratum_a008336();
> +	erratum_a009008();
>  #ifdef CONFIG_CHAIN_OF_TRUST
>  	/* In case of Secure Boot, the IBR configures the SMMU
>  	* to allow only Secure transactions.
> @@ -473,6 +497,7 @@ void fsl_lsch2_early_init_f(void)
>  	erratum_a009929();
>  	erratum_a009660();
>  	erratum_a010539();
> +	erratum_a009008();
>  }
>  #endif
>  
> diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
> index 8ad199f..62d7046 100644
> --- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
> +++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
> @@ -337,6 +337,12 @@ struct ccsr_gur {
>  #define SCFG_USBPWRFAULT_USB2_SHIFT	2
>  #define SCFG_USBPWRFAULT_USB1_SHIFT	0
>  
> +#define SCFG_BASE			0x01570000
> +#define SCFG_USB3PRM1CR_USB1		0x070
> +#define SCFG_USB3PRM1CR_USB2		0x07C
> +#define SCFG_USB3PRM1CR_USB3		0x088
> +#define USB_TXVREFTUNE			0x9
> +
>  #define SCFG_SNPCNFGCR_SECRDSNP		0x80000000
>  #define SCFG_SNPCNFGCR_SECWRSNP		0x40000000
>  #define SCFG_SNPCNFGCR_SATARDSNP	0x00800000
> diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
> index 59410aa..c622ee5 100644
> --- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
> +++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
> @@ -133,6 +133,7 @@
>  #define SCFG_BASE		0x01fc0000
>  #define SCFG_USB3PRM1CR			0x000
>  #define SCFG_USB3PRM1CR_INIT		0x27672b2a
> +#define USB_TXVREFTUNE			0x9

Should this also be SCFG_USB_... ? It looks terribly ad-hoc here.

>  #define SCFG_QSPICLKCTLR	0x10
>  
>  #define TP_ITYP_AV		0x00000001	/* Initiator available */
> 


-- 
Best regards,
Marek Vasut