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Date:   Wed, 23 Oct 2019 12:27:50 +0200
From:   Krzysztof Kozlowski <krzk@kernel.org>
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Kukjin Kim <kgene@kernel.org>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        linux-samsung-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linus.walleij@linaro.org,
        Tomasz Figa <tomasz.figa@gmail.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 05/36] ARM: samsung: make pm-debug platform independent
Message-ID: <20191023102750.GD10630@pi3>
References: <20191010202802.1132272-1-arnd@arndb.de>
 <20191010203043.1241612-1-arnd@arndb.de>
 <20191010203043.1241612-5-arnd@arndb.de>
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On Thu, Oct 10, 2019 at 10:29:49PM +0200, Arnd Bergmann wrote:
> The pm-debug code is one of the few things shared between s3c24xx/s3c64xx
> and the newer s5pv210. In order to make s5pv210 independent of plat-samsung,
> change the common bits of this code to no longer reference the s3c specific
> bits.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/arm/mach-s3c24xx/include/mach/pm-core.h  |  7 +--
>  arch/arm/mach-s3c64xx/include/mach/pm-core.h  | 44 +---------------
>  arch/arm/mach-s3c64xx/pm.c                    | 50 +++++++++++++++++++
>  arch/arm/mach-s5pv210/pm.c                    |  6 +--
>  .../arm/plat-samsung/include/plat/pm-common.h | 29 +++++------
>  arch/arm/plat-samsung/pm-debug.c              | 23 ++-------
>  arch/arm/plat-samsung/pm.c                    | 10 ++--
>  7 files changed, 80 insertions(+), 89 deletions(-)
> 
> diff --git a/arch/arm/mach-s3c24xx/include/mach/pm-core.h b/arch/arm/mach-s3c24xx/include/mach/pm-core.h
> index 5e4ce89d0158..8f87606c4cdc 100644
> --- a/arch/arm/mach-s3c24xx/include/mach/pm-core.h
> +++ b/arch/arm/mach-s3c24xx/include/mach/pm-core.h
> @@ -15,6 +15,7 @@
>  
>  static inline void s3c_pm_debug_init_uart(void)
>  {
> +#ifdef CONFIG_SAMSUNG_PM_DEBUG
>  	unsigned long tmp = __raw_readl(S3C2410_CLKCON);
>  
>  	/* re-start uart clocks */
> @@ -24,6 +25,7 @@ static inline void s3c_pm_debug_init_uart(void)
>  
>  	__raw_writel(tmp, S3C2410_CLKCON);
>  	udelay(10);
> +#endif
>  }
>  
>  static inline void s3c_pm_arch_prepare_irqs(void)
> @@ -75,11 +77,6 @@ static inline void s3c_pm_arch_show_resume_irqs(void)
>  				s3c_irqwake_eintmask);
>  }
>  
> -static inline void s3c_pm_arch_update_uart(void __iomem *regs,
> -					   struct pm_uart_save *save)
> -{
> -}
> -
>  static inline void s3c_pm_restored_gpios(void) { }
>  static inline void samsung_pm_saved_gpios(void) { }
>  
> diff --git a/arch/arm/mach-s3c64xx/include/mach/pm-core.h b/arch/arm/mach-s3c64xx/include/mach/pm-core.h
> index bbf79ed28583..33cf242734a0 100644
> --- a/arch/arm/mach-s3c64xx/include/mach/pm-core.h
> +++ b/arch/arm/mach-s3c64xx/include/mach/pm-core.h
> @@ -20,6 +20,7 @@
>  
>  static inline void s3c_pm_debug_init_uart(void)
>  {
> +#ifdef CONFIG_SAMSUNG_PM_DEBUG
>  	u32 tmp = __raw_readl(S3C_PCLK_GATE);
>  
>  	/* As a note, since the S3C64XX UARTs generally have multiple
> @@ -35,6 +36,7 @@ static inline void s3c_pm_debug_init_uart(void)
>  
>  	__raw_writel(tmp, S3C_PCLK_GATE);
>  	udelay(10);
> +#endif
>  }
>  
>  static inline void s3c_pm_arch_prepare_irqs(void)
> @@ -63,48 +65,6 @@ static inline void s3c_pm_arch_show_resume_irqs(void)
>  #define s3c_irqwake_intallow  0
>  #endif
>  
> -static inline void s3c_pm_arch_update_uart(void __iomem *regs,
> -					   struct pm_uart_save *save)
> -{
> -	u32 ucon = __raw_readl(regs + S3C2410_UCON);
> -	u32 ucon_clk = ucon & S3C6400_UCON_CLKMASK;
> -	u32 save_clk = save->ucon & S3C6400_UCON_CLKMASK;
> -	u32 new_ucon;
> -	u32 delta;
> -
> -	/* S3C64XX UART blocks only support level interrupts, so ensure that
> -	 * when we restore unused UART blocks we force the level interrupt
> -	 * settigs. */
> -	save->ucon |= S3C2410_UCON_TXILEVEL | S3C2410_UCON_RXILEVEL;
> -
> -	/* We have a constraint on changing the clock type of the UART
> -	 * between UCLKx and PCLK, so ensure that when we restore UCON
> -	 * that the CLK field is correctly modified if the bootloader
> -	 * has changed anything.
> -	 */
> -	if (ucon_clk != save_clk) {
> -		new_ucon = save->ucon;
> -		delta = ucon_clk ^ save_clk;
> -
> -		/* change from UCLKx => wrong PCLK,
> -		 * either UCLK can be tested for by a bit-test
> -		 * with UCLK0 */
> -		if (ucon_clk & S3C6400_UCON_UCLK0 &&
> -		    !(save_clk & S3C6400_UCON_UCLK0) &&
> -		    delta & S3C6400_UCON_PCLK2) {
> -			new_ucon &= ~S3C6400_UCON_UCLK0;
> -		} else if (delta == S3C6400_UCON_PCLK2) {
> -			/* as an precaution, don't change from
> -			 * PCLK2 => PCLK or vice-versa */
> -			new_ucon ^= S3C6400_UCON_PCLK2;
> -		}
> -
> -		S3C_PMDBG("ucon change %04x => %04x (save=%04x)\n",
> -			  ucon, new_ucon, save->ucon);
> -		save->ucon = new_ucon;
> -	}
> -}
> -
>  static inline void s3c_pm_restored_gpios(void)
>  {
>  	/* ensure sleep mode has been cleared from the system */
> diff --git a/arch/arm/mach-s3c64xx/pm.c b/arch/arm/mach-s3c64xx/pm.c
> index fd6dbb263ed5..a612e9779057 100644
> --- a/arch/arm/mach-s3c64xx/pm.c
> +++ b/arch/arm/mach-s3c64xx/pm.c
> @@ -305,6 +305,56 @@ static void s3c64xx_pm_prepare(void)
>  	__raw_writel(__raw_readl(S3C64XX_WAKEUP_STAT), S3C64XX_WAKEUP_STAT);
>  }
>  
> +#ifdef CONFIG_SAMSUNG_PM_DEBUG
> +void s3c_pm_arch_update_uart(void __iomem *regs, struct pm_uart_save *save)
> +{
> +	u32 ucon;
> +	u32 ucon_clk
> +	u32 save_clk;
> +	u32 new_ucon;
> +	u32 delta;
> +
> +	if (!soc_is_s3c64xx())
> +		return;
> +
> +	ucon = __raw_readl(regs + S3C2410_UCON);
> +	ucon_clk = ucon & S3C6400_UCON_CLKMASK;
> +	sav_clk = save->ucon & S3C6400_UCON_CLKMASK;
> +
> +	/* S3C64XX UART blocks only support level interrupts, so ensure that
> +	 * when we restore unused UART blocks we force the level interrupt
> +	 * settigs. */
> +	save->ucon |= S3C2410_UCON_TXILEVEL | S3C2410_UCON_RXILEVEL;
> +
> +	/* We have a constraint on changing the clock type of the UART
> +	 * between UCLKx and PCLK, so ensure that when we restore UCON
> +	 * that the CLK field is correctly modified if the bootloader
> +	 * has changed anything.
> +	 */
> +	if (ucon_clk != save_clk) {
> +		new_ucon = save->ucon;
> +		delta = ucon_clk ^ save_clk;
> +
> +		/* change from UCLKx => wrong PCLK,
> +		 * either UCLK can be tested for by a bit-test
> +		 * with UCLK0 */
> +		if (ucon_clk & S3C6400_UCON_UCLK0 &&
> +		    !(save_clk & S3C6400_UCON_UCLK0) &&
> +		    delta & S3C6400_UCON_PCLK2) {
> +			new_ucon &= ~S3C6400_UCON_UCLK0;
> +		} else if (delta == S3C6400_UCON_PCLK2) {
> +			/* as an precaution, don't change from
> +			 * PCLK2 => PCLK or vice-versa */
> +			new_ucon ^= S3C6400_UCON_PCLK2;
> +		}
> +
> +		S3C_PMDBG("ucon change %04x => %04x (save=%04x)\n",
> +			  ucon, new_ucon, save->ucon);
> +		save->ucon = new_ucon;
> +	}
> +}
> +#endif
> +
>  int __init s3c64xx_pm_init(void)
>  {
>  	int i;
> diff --git a/arch/arm/mach-s5pv210/pm.c b/arch/arm/mach-s5pv210/pm.c
> index b336df0c57f3..efdb5a27c060 100644
> --- a/arch/arm/mach-s5pv210/pm.c
> +++ b/arch/arm/mach-s5pv210/pm.c
> @@ -99,8 +99,6 @@ static int s5pv210_suspend_enter(suspend_state_t state)
>  	u32 eint_wakeup_mask = s5pv210_read_eint_wakeup_mask();
>  	int ret;
>  
> -	s3c_pm_debug_init();

Your patch is not equivalent here. If there is a reason behind removal
of UART init (e.g. not needed), I prefer to make it in separate patch.

Rest looks good.

Best regards,
Krzysztof