| Message ID | 1478517877-23733-6-git-send-email-riteshh@codeaurora.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
On 11/07, Ritesh Harjani wrote: > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > index 42f42aa..32b0b79 100644 > --- a/drivers/mmc/host/sdhci-msm.c > +++ b/drivers/mmc/host/sdhci-msm.c > @@ -58,11 +58,17 @@ > #define CORE_DLL_CONFIG 0x100 > #define CORE_DLL_STATUS 0x108 > > +#define CORE_DLL_CONFIG_2 0x1b4 > +#define CORE_FLL_CYCLE_CNT BIT(18) > +#define CORE_DLL_CLOCK_DISABLE BIT(21) > + > #define CORE_VENDOR_SPEC 0x10c > #define CORE_CLK_PWRSAVE BIT(1) > > #define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c > > +#define TCXO_FREQ 19200000 TCXO_FREQ could change based on the board. For example, IPQ has it as 25 MHz. > + > #define CDR_SELEXT_SHIFT 20 > #define CDR_SELEXT_MASK (0xf << CDR_SELEXT_SHIFT) > #define CMUX_SHIFT_PHASE_SHIFT 24 > @@ -330,6 +349,24 @@ static int msm_init_cm_dll(struct sdhci_host *host) > writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); > msm_cm_dll_set_freq(host); > > + if (msm_host->use_14lpp_dll_reset) { > + u32 mclk_freq = 0; > + > + if ((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2) > + & CORE_FLL_CYCLE_CNT)) I suggest you grow a local variable. > + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 8); Is the cast necessary? > + else > + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 4); Ditto > + > + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); > + config &= ~(0xFF << 10); > + config |= mclk_freq << 10; > + > + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); > + /* wait for 5us before enabling DLL clock */ Usually there's a barrier between writel_relaxed() and delay because we don't know when the writel will be posted out and the delay is there to wait for the operation to happen. Probably should change this to be a writel() instead. > + udelay(5); > + } > + > /* Write 0 to DLL_RST bit of DLL_CONFIG register */ > config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); > config &= ~CORE_DLL_RST; > @@ -340,6 +377,14 @@ static int msm_init_cm_dll(struct sdhci_host *host) > config &= ~CORE_DLL_PDN; > writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); > > + if (msm_host->use_14lpp_dll_reset) { > + msm_cm_dll_set_freq(host); > + /* Enable the DLL clock */ > + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); > + config &= ~CORE_DLL_CLOCK_DISABLE; > + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); > + } > + > /* Set DLL_EN bit to 1. */ > config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); > config |= CORE_DLL_EN; > @@ -641,6 +686,9 @@ static int sdhci_msm_probe(struct platform_device *pdev) > dev_dbg(&pdev->dev, "MCI Version: 0x%08x, major: 0x%04x, minor: 0x%02x\n", > core_version, core_major, core_minor); > > + if ((core_major == 1) && (core_minor >= 0x42)) Why so many parenthesis? > + msm_host->use_14lpp_dll_reset = true; > + > /*
On Tuesday, November 8, 2016 3:06:22 PM CET Stephen Boyd wrote: > > + > > + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); > > + config &= ~(0xFF << 10); > > + config |= mclk_freq << 10; > > + > > + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); > > + /* wait for 5us before enabling DLL clock */ > > Usually there's a barrier between writel_relaxed() and delay > because we don't know when the writel will be posted out and the > delay is there to wait for the operation to happen. Probably > should change this to be a writel() instead. > The barrier in writel() is not for posted writes, it is to synchronize with memory accesses *before* the write. In general, if you want to ensure that a write has made it to the device, you need to read back from the same address (the specific behavior may depend on the bus). While in general, using the non-relaxed accessors should be the default (and there should be a comment for each *_relaxed access), but I don't think using writel() would let you skip the delay here. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-clk" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Stephen, On 11/9/2016 4:36 AM, Stephen Boyd wrote: > On 11/07, Ritesh Harjani wrote: >> >> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c >> index 42f42aa..32b0b79 100644 >> --- a/drivers/mmc/host/sdhci-msm.c >> +++ b/drivers/mmc/host/sdhci-msm.c >> @@ -58,11 +58,17 @@ >> #define CORE_DLL_CONFIG 0x100 >> #define CORE_DLL_STATUS 0x108 >> >> +#define CORE_DLL_CONFIG_2 0x1b4 >> +#define CORE_FLL_CYCLE_CNT BIT(18) >> +#define CORE_DLL_CLOCK_DISABLE BIT(21) >> + >> #define CORE_VENDOR_SPEC 0x10c >> #define CORE_CLK_PWRSAVE BIT(1) >> >> #define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c >> >> +#define TCXO_FREQ 19200000 > > TCXO_FREQ could change based on the board. For example, IPQ has > it as 25 MHz. Actually not sure of the proper way on how to get this freq in driver today. We may use xo_board clock but, it is not available for all boards except 8996/8916 I guess. Also, there is no sdhc for IPQ board and for all other boards TCXO_FREQ is same where sdhci-msm driver is used. For that purpose this was defined here for sdhci-msm driver. Do you think in that case we should keep it this way for now and later change if a need arise to change the TCXO_FREQ ? > >> + >> #define CDR_SELEXT_SHIFT 20 >> #define CDR_SELEXT_MASK (0xf << CDR_SELEXT_SHIFT) >> #define CMUX_SHIFT_PHASE_SHIFT 24 >> @@ -330,6 +349,24 @@ static int msm_init_cm_dll(struct sdhci_host *host) >> writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); >> msm_cm_dll_set_freq(host); >> >> + if (msm_host->use_14lpp_dll_reset) { >> + u32 mclk_freq = 0; >> + >> + if ((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2) >> + & CORE_FLL_CYCLE_CNT)) > > I suggest you grow a local variable. Ok. > >> + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 8); > > Is the cast necessary? Will remove it. > >> + else >> + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 4); > > Ditto Will remove it. > >> + >> + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); >> + config &= ~(0xFF << 10); >> + config |= mclk_freq << 10; >> + >> + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); >> + /* wait for 5us before enabling DLL clock */ > > Usually there's a barrier between writel_relaxed() and delay > because we don't know when the writel will be posted out and the > delay is there to wait for the operation to happen. Probably > should change this to be a writel() instead. Arnd, already explained here. We do need the udelay here as per the HW sequence itself. > >> + udelay(5); >> + } >> + >> /* Write 0 to DLL_RST bit of DLL_CONFIG register */ >> config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); >> config &= ~CORE_DLL_RST; >> @@ -340,6 +377,14 @@ static int msm_init_cm_dll(struct sdhci_host *host) >> config &= ~CORE_DLL_PDN; >> writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); >> >> + if (msm_host->use_14lpp_dll_reset) { >> + msm_cm_dll_set_freq(host); >> + /* Enable the DLL clock */ >> + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); >> + config &= ~CORE_DLL_CLOCK_DISABLE; >> + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); >> + } >> + >> /* Set DLL_EN bit to 1. */ >> config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); >> config |= CORE_DLL_EN; >> @@ -641,6 +686,9 @@ static int sdhci_msm_probe(struct platform_device *pdev) >> dev_dbg(&pdev->dev, "MCI Version: 0x%08x, major: 0x%04x, minor: 0x%02x\n", >> core_version, core_major, core_minor); >> >> + if ((core_major == 1) && (core_minor >= 0x42)) > > Why so many parenthesis? Sure, will remove it. > >> + msm_host->use_14lpp_dll_reset = true; >> + >> /* >
On 11/09, Ritesh Harjani wrote: > Hi Stephen, > > On 11/9/2016 4:36 AM, Stephen Boyd wrote: > >On 11/07, Ritesh Harjani wrote: > >> > >>diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > >>index 42f42aa..32b0b79 100644 > >>--- a/drivers/mmc/host/sdhci-msm.c > >>+++ b/drivers/mmc/host/sdhci-msm.c > >>@@ -58,11 +58,17 @@ > >> #define CORE_DLL_CONFIG 0x100 > >> #define CORE_DLL_STATUS 0x108 > >> > >>+#define CORE_DLL_CONFIG_2 0x1b4 > >>+#define CORE_FLL_CYCLE_CNT BIT(18) > >>+#define CORE_DLL_CLOCK_DISABLE BIT(21) > >>+ > >> #define CORE_VENDOR_SPEC 0x10c > >> #define CORE_CLK_PWRSAVE BIT(1) > >> > >> #define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c > >> > >>+#define TCXO_FREQ 19200000 > > > >TCXO_FREQ could change based on the board. For example, IPQ has > >it as 25 MHz. > Actually not sure of the proper way on how to get this freq in driver > today. We may use xo_board clock but, it is not available for all boards > except 8996/8916 I guess. > > Also, there is no sdhc for IPQ board and for all other boards > TCXO_FREQ is same where sdhci-msm driver is used. For that purpose > this was defined here for sdhci-msm driver. > > Do you think in that case we should keep it this way for now and > later change if a need arise to change the TCXO_FREQ ? We've added xo_board (or cxo_board/pxo_board) to all the qcom platforms upstream, so there should always be something to reference in the dts and call clk_get_rate() on. So I would add it to the binding as another clock and then use that instead of hardcoding the value. That's much more flexible in case this changes in the future.
Hi Stephen, On 11/10/2016 2:13 AM, Stephen Boyd wrote: > On 11/09, Ritesh Harjani wrote: >> Hi Stephen, >> >> On 11/9/2016 4:36 AM, Stephen Boyd wrote: >>> On 11/07, Ritesh Harjani wrote: >>>> >>>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c >>>> index 42f42aa..32b0b79 100644 >>>> --- a/drivers/mmc/host/sdhci-msm.c >>>> +++ b/drivers/mmc/host/sdhci-msm.c >>>> @@ -58,11 +58,17 @@ >>>> #define CORE_DLL_CONFIG 0x100 >>>> #define CORE_DLL_STATUS 0x108 >>>> >>>> +#define CORE_DLL_CONFIG_2 0x1b4 >>>> +#define CORE_FLL_CYCLE_CNT BIT(18) >>>> +#define CORE_DLL_CLOCK_DISABLE BIT(21) >>>> + >>>> #define CORE_VENDOR_SPEC 0x10c >>>> #define CORE_CLK_PWRSAVE BIT(1) >>>> >>>> #define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c >>>> >>>> +#define TCXO_FREQ 19200000 >>> >>> TCXO_FREQ could change based on the board. For example, IPQ has >>> it as 25 MHz. >> Actually not sure of the proper way on how to get this freq in driver >> today. We may use xo_board clock but, it is not available for all boards >> except 8996/8916 I guess. >> >> Also, there is no sdhc for IPQ board and for all other boards >> TCXO_FREQ is same where sdhci-msm driver is used. For that purpose >> this was defined here for sdhci-msm driver. >> >> Do you think in that case we should keep it this way for now and >> later change if a need arise to change the TCXO_FREQ ? > > We've added xo_board (or cxo_board/pxo_board) to all the qcom > platforms upstream, so there should always be something to > reference in the dts and call clk_get_rate() on. So I would add > it to the binding as another clock and then use that instead of > hardcoding the value. That's much more flexible in case this > changes in the future. > Sure, I have addressed this in v7 as per your above comment.
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 42f42aa..32b0b79 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -58,11 +58,17 @@ #define CORE_DLL_CONFIG 0x100 #define CORE_DLL_STATUS 0x108 +#define CORE_DLL_CONFIG_2 0x1b4 +#define CORE_FLL_CYCLE_CNT BIT(18) +#define CORE_DLL_CLOCK_DISABLE BIT(21) + #define CORE_VENDOR_SPEC 0x10c #define CORE_CLK_PWRSAVE BIT(1) #define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c +#define TCXO_FREQ 19200000 + #define CDR_SELEXT_SHIFT 20 #define CDR_SELEXT_MASK (0xf << CDR_SELEXT_SHIFT) #define CMUX_SHIFT_PHASE_SHIFT 24 @@ -76,6 +82,7 @@ struct sdhci_msm_host { struct clk *pclk; /* SDHC peripheral bus clock */ struct clk *bus_clk; /* SDHC bus voter clock */ struct mmc_host *mmc; + bool use_14lpp_dll_reset; }; /* Platform specific tuning */ @@ -304,6 +311,8 @@ static inline void msm_cm_dll_set_freq(struct sdhci_host *host) static int msm_init_cm_dll(struct sdhci_host *host) { struct mmc_host *mmc = host->mmc; + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); int wait_cnt = 50; unsigned long flags; u32 config = 0; @@ -319,6 +328,16 @@ static int msm_init_cm_dll(struct sdhci_host *host) config &= ~CORE_CLK_PWRSAVE; writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC); + if (msm_host->use_14lpp_dll_reset) { + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); + config &= ~CORE_CK_OUT_EN; + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); + + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); + config |= CORE_DLL_CLOCK_DISABLE; + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); + } + /* Write 1 to DLL_RST bit of DLL_CONFIG register */ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); config |= CORE_DLL_RST; @@ -330,6 +349,24 @@ static int msm_init_cm_dll(struct sdhci_host *host) writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); msm_cm_dll_set_freq(host); + if (msm_host->use_14lpp_dll_reset) { + u32 mclk_freq = 0; + + if ((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2) + & CORE_FLL_CYCLE_CNT)) + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 8); + else + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 4); + + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); + config &= ~(0xFF << 10); + config |= mclk_freq << 10; + + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); + /* wait for 5us before enabling DLL clock */ + udelay(5); + } + /* Write 0 to DLL_RST bit of DLL_CONFIG register */ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); config &= ~CORE_DLL_RST; @@ -340,6 +377,14 @@ static int msm_init_cm_dll(struct sdhci_host *host) config &= ~CORE_DLL_PDN; writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); + if (msm_host->use_14lpp_dll_reset) { + msm_cm_dll_set_freq(host); + /* Enable the DLL clock */ + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); + config &= ~CORE_DLL_CLOCK_DISABLE; + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); + } + /* Set DLL_EN bit to 1. */ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); config |= CORE_DLL_EN; @@ -641,6 +686,9 @@ static int sdhci_msm_probe(struct platform_device *pdev) dev_dbg(&pdev->dev, "MCI Version: 0x%08x, major: 0x%04x, minor: 0x%02x\n", core_version, core_major, core_minor); + if ((core_major == 1) && (core_minor >= 0x42)) + msm_host->use_14lpp_dll_reset = true; + /* * Support for some capabilities is not advertised by newer * controller versions and must be explicitly enabled.