linux-kernel - Re: [PATCH V4 1/2] mmc: sdhci: Fix O2 Host data read/write DLL Lock Phase shift issue

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Message-ID: <34425078-f5fa-5f7d-1a80-c27346bb87d9@intel.com>
Date:   Tue, 6 Aug 2019 14:07:11 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Shirley Her (SC)" <shirley.her@...hubtech.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "Louis Lu (TP)" <louis.lu@...hubtech.com>,
        "Chevron Li (WH)" <chevron.li@...hubtech.com>,
        "Max Huang (SC)" <max.huang@...hubtech.com>
Subject: Re: [PATCH V4 1/2] mmc: sdhci: Fix O2 Host data read/write DLL Lock
 Phase shift issue

On 2/08/19 8:39 PM, Shirley Her (SC) wrote:
> Fix data read/write error in HS200 mode due to chip DLL lock phase shift
> 
> Signed-off-by:Shirley Her<shirley.her@...hubtech.com>
> ---
> change in V4:
>  1. add a bug fix in V3
> 
> change in V3:
>  1. add more explanation in dll_recovery and execute_tuning function
>  2. move dll_adjust_count to O2_host struct
>  3. fix some coding style error
>  4. renaming O2_PLL_WDT_CONTROL1 TO O2_PLL_DLL_WDT_CONTROL1
> 
> change in V2:
>  1. use usleep_range instead of udelay
>  2. move dll_adjust_count to sdhci-pci-o2micro.c
> 
> chagne in V1:
>  1. add error recovery function to relock DLL with correct phase
>  2. retuning HS200 after DLL locked
> ---
>  drivers/mmc/host/sdhci-pci-o2micro.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
> index 9dc4548..186a33d 100644
> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
> +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
> @@ -51,7 +51,7 @@
>  #define O2_SD_VENDOR_SETTING2	0x1C8
>  #define O2_SD_HW_TUNING_DISABLE	BIT(4)
>  
> -#define O2_PLL_WDT_CONTROL1	0x1CC
> +#define O2_PLL_DLL_WDT_CONTROL1	0x1CC

Please also change the other places that O2_PLL_WDT_CONTROL1 appears, so
that the code compiles.

>  #define  O2_PLL_FORCE_ACTIVE	BIT(18)
>  #define  O2_PLL_LOCK_STATUS	BIT(14)
>  #define  O2_PLL_SOFT_RESET	BIT(12)
>