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Message-ID: <91ec4e55-8f95-f6ee-1991-458f38916cfe@intel.com>
Date: Thu, 19 Jan 2017 12:04:05 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Ritesh Harjani <riteshh@...eaurora.org>, ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
shawn.lin@...k-chips.com, linux-arm-msm@...r.kernel.org,
georgi.djakov@...aro.org, asutoshd@...eaurora.org,
stummala@...eaurora.org, venkatg@...eaurora.org,
pramod.gurav@...aro.org, jeremymc@...hat.com, git@...r.de
Subject: Re: [RESEND PATCHv1 1/8] mmc: sdhci-msm: Factor out
sdhci_msm_hc_select_mode
On 10/01/17 09:00, Ritesh Harjani wrote:
> This factors out sdhci_msm_hc_select_mode to later use
> it during enhanced_strobe mode select.
> It also further breaks sdhci_msm_hc_select_mode
> into separate functions for configuring HS400 mode
> or other modes.
>
> Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
> drivers/mmc/host/sdhci-msm.c | 201 ++++++++++++++++++++++++-------------------
> 1 file changed, 114 insertions(+), 87 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 32879b8..1e42647 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -464,6 +464,119 @@ static int msm_init_cm_dll(struct sdhci_host *host)
> return 0;
> }
>
> +static void msm_hc_select_default(struct sdhci_host *host)
> +{
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + u32 config;
> +
> + if (!msm_host->use_cdclp533) {
> + config = readl_relaxed(host->ioaddr +
> + CORE_VENDOR_SPEC3);
> + config &= ~CORE_PWRSAVE_DLL;
> + writel_relaxed(config, host->ioaddr +
> + CORE_VENDOR_SPEC3);
> + }
> +
> + config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> + config &= ~CORE_HC_MCLK_SEL_MASK;
> + config |= CORE_HC_MCLK_SEL_DFLT;
> + writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> +
> + /*
> + * Disable HC_SELECT_IN to be able to use the UHS mode select
> + * configuration from Host Control2 register for all other
> + * modes.
> + * Write 0 to HC_SELECT_IN and HC_SELECT_IN_EN field
> + * in VENDOR_SPEC_FUNC
> + */
> + config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> + config &= ~CORE_HC_SELECT_IN_EN;
> + config &= ~CORE_HC_SELECT_IN_MASK;
> + writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> +
> + /*
> + * Make sure above writes impacting free running MCLK are completed
> + * before changing the clk_rate at GCC.
> + */
> + wmb();
> +}
> +
> +static void msm_hc_select_hs400(struct sdhci_host *host)
> +{
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + u32 config, dll_lock;
> + int rc;
> +
> + /* Select the divided clock (free running MCLK/2) */
> + config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> + config &= ~CORE_HC_MCLK_SEL_MASK;
> + config |= CORE_HC_MCLK_SEL_HS400;
> +
> + writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> + /*
> + * Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
> + * register
> + */
> + if (msm_host->tuning_done && !msm_host->calibration_done) {
> + config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> + config |= CORE_HC_SELECT_IN_HS400;
> + config |= CORE_HC_SELECT_IN_EN;
> + writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> + }
> + if (!msm_host->clk_rate && !msm_host->use_cdclp533) {
> + /*
> + * Poll on DLL_LOCK or DDR_DLL_LOCK bits in
> + * CORE_DLL_STATUS to be set. This should get set
> + * within 15 us at 200 MHz.
> + */
> + rc = readl_relaxed_poll_timeout(host->ioaddr +
> + CORE_DLL_STATUS,
> + dll_lock,
> + (dll_lock &
> + (CORE_DLL_LOCK |
> + CORE_DDR_DLL_LOCK)), 10,
> + 1000);
> + if (rc == -ETIMEDOUT)
> + pr_err("%s: Unable to get DLL_LOCK/DDR_DLL_LOCK, dll_status: 0x%08x\n",
> + mmc_hostname(host->mmc), dll_lock);
> + }
> + /*
> + * Make sure above writes impacting free running MCLK are completed
> + * before changing the clk_rate at GCC.
> + */
> + wmb();
> +}
> +
> +/*
> + * sdhci_msm_hc_select_mode :- In general all timing modes are
> + * controlled via UHS mode select in Host Control2 register.
> + * eMMC specific HS200/HS400 doesn't have their respective modes
> + * defined here, hence we use these values.
> + *
> + * HS200 - SDR104 (Since they both are equivalent in functionality)
> + * HS400 - This involves multiple configurations
> + * Initially SDR104 - when tuning is required as HS200
> + * Then when switching to DDR @ 400MHz (HS400) we use
> + * the vendor specific HC_SELECT_IN to control the mode.
> + *
> + * In addition to controlling the modes we also need to select the
> + * correct input clock for DLL depending on the mode.
> + *
> + * HS400 - divided clock (free running MCLK/2)
> + * All other modes - default (free running MCLK)
> + */
> +void sdhci_msm_hc_select_mode(struct sdhci_host *host)
> +{
> + struct mmc_ios ios = host->mmc->ios;
> +
> + if (ios.timing == MMC_TIMING_MMC_HS400)
> + msm_hc_select_hs400(host);
> + else
> + msm_hc_select_default(host);
> +}
> +
> static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -894,7 +1007,6 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> struct mmc_ios curr_ios = host->mmc->ios;
> - u32 config, dll_lock;
> int rc;
>
> if (!clock) {
> @@ -913,93 +1025,8 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
> curr_ios.timing == MMC_TIMING_MMC_DDR52 ||
> curr_ios.timing == MMC_TIMING_MMC_HS400)
> clock *= 2;
> - /*
> - * In general all timing modes are controlled via UHS mode select in
> - * Host Control2 register. eMMC specific HS200/HS400 doesn't have
> - * their respective modes defined here, hence we use these values.
> - *
> - * HS200 - SDR104 (Since they both are equivalent in functionality)
> - * HS400 - This involves multiple configurations
> - * Initially SDR104 - when tuning is required as HS200
> - * Then when switching to DDR @ 400MHz (HS400) we use
> - * the vendor specific HC_SELECT_IN to control the mode.
> - *
> - * In addition to controlling the modes we also need to select the
> - * correct input clock for DLL depending on the mode.
> - *
> - * HS400 - divided clock (free running MCLK/2)
> - * All other modes - default (free running MCLK)
> - */
> - if (curr_ios.timing == MMC_TIMING_MMC_HS400) {
> - /* Select the divided clock (free running MCLK/2) */
> - config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> - config &= ~CORE_HC_MCLK_SEL_MASK;
> - config |= CORE_HC_MCLK_SEL_HS400;
>
> - writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> - /*
> - * Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
> - * register
> - */
> - if (msm_host->tuning_done && !msm_host->calibration_done) {
> - /*
> - * Write 0x6 to HC_SELECT_IN and 1 to HC_SELECT_IN_EN
> - * field in VENDOR_SPEC_FUNC
> - */
> - config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> - config |= CORE_HC_SELECT_IN_HS400;
> - config |= CORE_HC_SELECT_IN_EN;
> - writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> - }
> - if (!msm_host->clk_rate && !msm_host->use_cdclp533) {
> - /*
> - * Poll on DLL_LOCK or DDR_DLL_LOCK bits in
> - * CORE_DLL_STATUS to be set. This should get set
> - * within 15 us at 200 MHz.
> - */
> - rc = readl_relaxed_poll_timeout(host->ioaddr +
> - CORE_DLL_STATUS,
> - dll_lock,
> - (dll_lock &
> - (CORE_DLL_LOCK |
> - CORE_DDR_DLL_LOCK)), 10,
> - 1000);
> - if (rc == -ETIMEDOUT)
> - pr_err("%s: Unable to get DLL_LOCK/DDR_DLL_LOCK, dll_status: 0x%08x\n",
> - mmc_hostname(host->mmc), dll_lock);
> - }
> - } else {
> - if (!msm_host->use_cdclp533) {
> - config = readl_relaxed(host->ioaddr +
> - CORE_VENDOR_SPEC3);
> - config &= ~CORE_PWRSAVE_DLL;
> - writel_relaxed(config, host->ioaddr +
> - CORE_VENDOR_SPEC3);
> - }
> -
> - config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> - config &= ~CORE_HC_MCLK_SEL_MASK;
> - config |= CORE_HC_MCLK_SEL_DFLT;
> - writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> -
> - /*
> - * Disable HC_SELECT_IN to be able to use the UHS mode select
> - * configuration from Host Control2 register for all other
> - * modes.
> - * Write 0 to HC_SELECT_IN and HC_SELECT_IN_EN field
> - * in VENDOR_SPEC_FUNC
> - */
> - config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
> - config &= ~CORE_HC_SELECT_IN_EN;
> - config &= ~CORE_HC_SELECT_IN_MASK;
> - writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
> - }
> -
> - /*
> - * Make sure above writes impacting free running MCLK are completed
> - * before changing the clk_rate at GCC.
> - */
> - wmb();
> + sdhci_msm_hc_select_mode(host);
>
> rc = clk_set_rate(msm_host->clk, clock);
> if (rc) {
>
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