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Date: Wed, 4 Sep 2019 11:53:03 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Shirley Her (SC)" <shirley.her@...hubtech.com>
Cc: "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Chevron Li (WH)" <chevron.li@...hubtech.com>,
"Shaper Liu (WH)" <shaper.liu@...hubtech.com>,
"Louis Lu (TP)" <louis.lu@...hubtech.com>,
"Xiaoguang Yu (WH)" <xiaoguang.yu@...hubtech.com>,
"Max Huang (SC)" <max.huang@...hubtech.com>
Subject: Re: [PATCH V9 2/3] mmc: sdhci-pci-o2micro: Move functions in
preparation to fix DLL lock phase shift issue
On Thu, 29 Aug 2019 at 19:41, Shirley Her (SC)
<shirley.her@...hubtech.com> wrote:
>
> Move functions in preparation to fix DLL lock phase shift issue
>
> Signed-off-by: Shirley Her <shirley.her@...hubtech.com>
Applied for next, thanks!
Kind regards
Uffe
> ---
> change in V9:
> 1. modify subject and commit message to match the patch
>
> change in V8:
> 1. fix patch format error
>
> change in V7:
> 1. change subject to match the patch
> 2. move functions in preparation to fix DLL lock phase shift issue
>
> change in V6:
> 1. change subject and commit message to match the patch
> 2. modify the get CD status function
> 3. re-arrange the order of some functions
>
> change in V5:
> 1. split 2 patches into 3 patches
> 2. make dll_adjust_count start from 0
> 3. fix ret overwritten issue
> 4. use break instead of goto
>
> change in V4:
> 1. add a bug fix for 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 | 187 ++++++++++++++++++-----------------
> 1 file changed, 94 insertions(+), 93 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
> index b3a33d9..57c8b83 100644
> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
> +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
> @@ -58,6 +58,100 @@
>
> #define O2_SD_DETECT_SETTING 0x324
>
> +static void sdhci_o2_wait_card_detect_stable(struct sdhci_host *host)
> +{
> + ktime_t timeout;
> + u32 scratch32;
> +
> + /* Wait max 50 ms */
> + timeout = ktime_add_ms(ktime_get(), 50);
> + while (1) {
> + bool timedout = ktime_after(ktime_get(), timeout);
> +
> + scratch32 = sdhci_readl(host, SDHCI_PRESENT_STATE);
> + if ((scratch32 & SDHCI_CARD_PRESENT) >> SDHCI_CARD_PRES_SHIFT
> + == (scratch32 & SDHCI_CD_LVL) >> SDHCI_CD_LVL_SHIFT)
> + break;
> +
> + if (timedout) {
> + pr_err("%s: Card Detect debounce never finished.\n",
> + mmc_hostname(host->mmc));
> + sdhci_dumpregs(host);
> + return;
> + }
> + udelay(10);
> + }
> +}
> +
> +static void sdhci_o2_enable_internal_clock(struct sdhci_host *host)
> +{
> + ktime_t timeout;
> + u16 scratch;
> + u32 scratch32;
> +
> + /* PLL software reset */
> + scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
> + scratch32 |= O2_PLL_SOFT_RESET;
> + sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> + udelay(1);
> + scratch32 &= ~(O2_PLL_SOFT_RESET);
> + sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> +
> + /* PLL force active */
> + scratch32 |= O2_PLL_FORCE_ACTIVE;
> + sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> +
> + /* Wait max 20 ms */
> + timeout = ktime_add_ms(ktime_get(), 20);
> + while (1) {
> + bool timedout = ktime_after(ktime_get(), timeout);
> +
> + scratch = sdhci_readw(host, O2_PLL_DLL_WDT_CONTROL1);
> + if (scratch & O2_PLL_LOCK_STATUS)
> + break;
> + if (timedout) {
> + pr_err("%s: Internal clock never stabilised.\n",
> + mmc_hostname(host->mmc));
> + sdhci_dumpregs(host);
> + goto out;
> + }
> + udelay(10);
> + }
> +
> + /* Wait for card detect finish */
> + udelay(1);
> + sdhci_o2_wait_card_detect_stable(host);
> +
> +out:
> + /* Cancel PLL force active */
> + scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
> + scratch32 &= ~O2_PLL_FORCE_ACTIVE;
> + sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> +}
> +
> +static int sdhci_o2_get_cd(struct mmc_host *mmc)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> +
> + sdhci_o2_enable_internal_clock(host);
> +
> + return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
> +}
> +
> +static void o2_pci_set_baseclk(struct sdhci_pci_chip *chip, u32 value)
> +{
> + u32 scratch_32;
> +
> + pci_read_config_dword(chip->pdev,
> + O2_SD_PLL_SETTING, &scratch_32);
> +
> + scratch_32 &= 0x0000FFFF;
> + scratch_32 |= value;
> +
> + pci_write_config_dword(chip->pdev,
> + O2_SD_PLL_SETTING, scratch_32);
> +}
> +
> static void sdhci_o2_set_tuning_mode(struct sdhci_host *host)
> {
> u16 reg;
> @@ -136,19 +230,6 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
> return 0;
> }
>
> -static void o2_pci_set_baseclk(struct sdhci_pci_chip *chip, u32 value)
> -{
> - u32 scratch_32;
> - pci_read_config_dword(chip->pdev,
> - O2_SD_PLL_SETTING, &scratch_32);
> -
> - scratch_32 &= 0x0000FFFF;
> - scratch_32 |= value;
> -
> - pci_write_config_dword(chip->pdev,
> - O2_SD_PLL_SETTING, scratch_32);
> -}
> -
> static void o2_pci_led_enable(struct sdhci_pci_chip *chip)
> {
> int ret;
> @@ -284,86 +365,6 @@ static void sdhci_pci_o2_enable_msi(struct sdhci_pci_chip *chip,
> host->irq = pci_irq_vector(chip->pdev, 0);
> }
>
> -static void sdhci_o2_wait_card_detect_stable(struct sdhci_host *host)
> -{
> - ktime_t timeout;
> - u32 scratch32;
> -
> - /* Wait max 50 ms */
> - timeout = ktime_add_ms(ktime_get(), 50);
> - while (1) {
> - bool timedout = ktime_after(ktime_get(), timeout);
> -
> - scratch32 = sdhci_readl(host, SDHCI_PRESENT_STATE);
> - if ((scratch32 & SDHCI_CARD_PRESENT) >> SDHCI_CARD_PRES_SHIFT
> - == (scratch32 & SDHCI_CD_LVL) >> SDHCI_CD_LVL_SHIFT)
> - break;
> -
> - if (timedout) {
> - pr_err("%s: Card Detect debounce never finished.\n",
> - mmc_hostname(host->mmc));
> - sdhci_dumpregs(host);
> - return;
> - }
> - udelay(10);
> - }
> -}
> -
> -static void sdhci_o2_enable_internal_clock(struct sdhci_host *host)
> -{
> - ktime_t timeout;
> - u16 scratch;
> - u32 scratch32;
> -
> - /* PLL software reset */
> - scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
> - scratch32 |= O2_PLL_SOFT_RESET;
> - sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> - udelay(1);
> - scratch32 &= ~(O2_PLL_SOFT_RESET);
> - sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> -
> - /* PLL force active */
> - scratch32 |= O2_PLL_FORCE_ACTIVE;
> - sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> -
> - /* Wait max 20 ms */
> - timeout = ktime_add_ms(ktime_get(), 20);
> - while (1) {
> - bool timedout = ktime_after(ktime_get(), timeout);
> -
> - scratch = sdhci_readw(host, O2_PLL_DLL_WDT_CONTROL1);
> - if (scratch & O2_PLL_LOCK_STATUS)
> - break;
> - if (timedout) {
> - pr_err("%s: Internal clock never stabilised.\n",
> - mmc_hostname(host->mmc));
> - sdhci_dumpregs(host);
> - goto out;
> - }
> - udelay(10);
> - }
> -
> - /* Wait for card detect finish */
> - udelay(1);
> - sdhci_o2_wait_card_detect_stable(host);
> -
> -out:
> - /* Cancel PLL force active */
> - scratch32 = sdhci_readl(host, O2_PLL_DLL_WDT_CONTROL1);
> - scratch32 &= ~O2_PLL_FORCE_ACTIVE;
> - sdhci_writel(host, scratch32, O2_PLL_DLL_WDT_CONTROL1);
> -}
> -
> -static int sdhci_o2_get_cd(struct mmc_host *mmc)
> -{
> - struct sdhci_host *host = mmc_priv(mmc);
> -
> - sdhci_o2_enable_internal_clock(host);
> -
> - return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
> -}
> -
> static void sdhci_o2_enable_clk(struct sdhci_host *host, u16 clk)
> {
> /* Enable internal clock */
> --
> 2.7.4
>
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