Re: [PATCH] mmc: sdhci-pci-gli: Set SDR104's clock to 205MHz and enable SSC for GL975x

From: Ulf Hansson
Date: Wed Aug 05 2020 - 02:34:19 EST

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On Fri, 17 Jul 2020 at 05:33, Ben Chuang <benchuanggli@xxxxxxxxx> wrote:
>
> From: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
>
> Set SDR104's clock to 205MHz and enable SSC for GL9750 and GL9755
>
> Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>

Applied for next (a while ago), thanks!

Kind regards
Uffe

> ---
> drivers/mmc/host/sdhci-pci-gli.c | 220 ++++++++++++++++++++++++++++++-
> 1 file changed, 218 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index ca0166d9bf82..5da2b06d84ae 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -31,10 +31,18 @@
> #define SDHCI_GLI_9750_ALL_RST (BIT(24)|BIT(25)|BIT(28)|BIT(30))
>
> #define SDHCI_GLI_9750_PLL 0x864
> +#define SDHCI_GLI_9750_PLL_LDIV GENMASK(9, 0)
> +#define SDHCI_GLI_9750_PLL_PDIV GENMASK(14, 12)
> +#define SDHCI_GLI_9750_PLL_DIR BIT(15)
> #define SDHCI_GLI_9750_PLL_TX2_INV BIT(23)
> #define SDHCI_GLI_9750_PLL_TX2_DLY GENMASK(22, 20)
> #define GLI_9750_PLL_TX2_INV_VALUE 0x1
> #define GLI_9750_PLL_TX2_DLY_VALUE 0x0
> +#define SDHCI_GLI_9750_PLLSSC_STEP GENMASK(28, 24)
> +#define SDHCI_GLI_9750_PLLSSC_EN BIT(31)
> +
> +#define SDHCI_GLI_9750_PLLSSC 0x86C
> +#define SDHCI_GLI_9750_PLLSSC_PPM GENMASK(31, 16)
>
> #define SDHCI_GLI_9750_SW_CTRL 0x874
> #define SDHCI_GLI_9750_SW_CTRL_4 GENMASK(7, 6)
> @@ -76,6 +84,21 @@
> #define PCIE_GLI_9763E_SCR 0x8E0
> #define GLI_9763E_SCR_AXI_REQ BIT(9)
>
> +#define PCI_GLI_9755_WT 0x800
> +#define PCI_GLI_9755_WT_EN BIT(0)
> +#define GLI_9755_WT_EN_ON 0x1
> +#define GLI_9755_WT_EN_OFF 0x0
> +
> +#define PCI_GLI_9755_PLL 0x64
> +#define PCI_GLI_9755_PLL_LDIV GENMASK(9, 0)
> +#define PCI_GLI_9755_PLL_PDIV GENMASK(14, 12)
> +#define PCI_GLI_9755_PLL_DIR BIT(15)
> +#define PCI_GLI_9755_PLLSSC_STEP GENMASK(28, 24)
> +#define PCI_GLI_9755_PLLSSC_EN BIT(31)
> +
> +#define PCI_GLI_9755_PLLSSC 0x68
> +#define PCI_GLI_9755_PLLSSC_PPM GENMASK(15, 0)
> +
> #define GLI_MAX_TUNING_LOOP 40
>
> /* Genesys Logic chipset */
> @@ -280,6 +303,84 @@ static int gl9750_execute_tuning(struct sdhci_host *host, u32 opcode)
> return 0;
> }
>
> +static void gl9750_disable_ssc_pll(struct sdhci_host *host)
> +{
> + u32 pll;
> +
> + gl9750_wt_on(host);
> + pll = sdhci_readl(host, SDHCI_GLI_9750_PLL);
> + pll &= ~(SDHCI_GLI_9750_PLL_DIR | SDHCI_GLI_9750_PLLSSC_EN);
> + sdhci_writel(host, pll, SDHCI_GLI_9750_PLL);
> + gl9750_wt_off(host);
> +}
> +
> +static void gl9750_set_pll(struct sdhci_host *host, u8 dir, u16 ldiv, u8 pdiv)
> +{
> + u32 pll;
> +
> + gl9750_wt_on(host);
> + pll = sdhci_readl(host, SDHCI_GLI_9750_PLL);
> + pll &= ~(SDHCI_GLI_9750_PLL_LDIV |
> + SDHCI_GLI_9750_PLL_PDIV |
> + SDHCI_GLI_9750_PLL_DIR);
> + pll |= FIELD_PREP(SDHCI_GLI_9750_PLL_LDIV, ldiv) |
> + FIELD_PREP(SDHCI_GLI_9750_PLL_PDIV, pdiv) |
> + FIELD_PREP(SDHCI_GLI_9750_PLL_DIR, dir);
> + sdhci_writel(host, pll, SDHCI_GLI_9750_PLL);
> + gl9750_wt_off(host);
> +
> + /* wait for pll stable */
> + mdelay(1);
> +}
> +
> +static void gl9750_set_ssc(struct sdhci_host *host, u8 enable, u8 step, u16 ppm)
> +{
> + u32 pll;
> + u32 ssc;
> +
> + gl9750_wt_on(host);
> + pll = sdhci_readl(host, SDHCI_GLI_9750_PLL);
> + ssc = sdhci_readl(host, SDHCI_GLI_9750_PLLSSC);
> + pll &= ~(SDHCI_GLI_9750_PLLSSC_STEP |
> + SDHCI_GLI_9750_PLLSSC_EN);
> + ssc &= ~SDHCI_GLI_9750_PLLSSC_PPM;
> + pll |= FIELD_PREP(SDHCI_GLI_9750_PLLSSC_STEP, step) |
> + FIELD_PREP(SDHCI_GLI_9750_PLLSSC_EN, enable);
> + ssc |= FIELD_PREP(SDHCI_GLI_9750_PLLSSC_PPM, ppm);
> + sdhci_writel(host, ssc, SDHCI_GLI_9750_PLLSSC);
> + sdhci_writel(host, pll, SDHCI_GLI_9750_PLL);
> + gl9750_wt_off(host);
> +}
> +
> +static void gl9750_set_ssc_pll_205mhz(struct sdhci_host *host)
> +{
> + /* set pll to 205MHz and enable ssc */
> + gl9750_set_ssc(host, 0x1, 0x1F, 0xFFE7);
> + gl9750_set_pll(host, 0x1, 0x246, 0x0);
> +}
> +
> +static void sdhci_gl9750_set_clock(struct sdhci_host *host, unsigned int clock)
> +{
> + struct mmc_ios *ios = &host->mmc->ios;
> + u16 clk;
> +
> + host->mmc->actual_clock = 0;
> +
> + gl9750_disable_ssc_pll(host);
> + sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> +
> + if (clock == 0)
> + return;
> +
> + clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
> + if (clock == 200000000 && ios->timing == MMC_TIMING_UHS_SDR104) {
> + host->mmc->actual_clock = 205000000;
> + gl9750_set_ssc_pll_205mhz(host);
> + }
> +
> + sdhci_enable_clk(host, clk);
> +}
> +
> static void gli_pcie_enable_msi(struct sdhci_pci_slot *slot)
> {
> int ret;
> @@ -295,6 +396,121 @@ static void gli_pcie_enable_msi(struct sdhci_pci_slot *slot)
> slot->host->irq = pci_irq_vector(slot->chip->pdev, 0);
> }
>
> +static inline void gl9755_wt_on(struct pci_dev *pdev)
> +{
> + u32 wt_value;
> + u32 wt_enable;
> +
> + pci_read_config_dword(pdev, PCI_GLI_9755_WT, &wt_value);
> + wt_enable = FIELD_GET(PCI_GLI_9755_WT_EN, wt_value);
> +
> + if (wt_enable == GLI_9755_WT_EN_ON)
> + return;
> +
> + wt_value &= ~PCI_GLI_9755_WT_EN;
> + wt_value |= FIELD_PREP(PCI_GLI_9755_WT_EN, GLI_9755_WT_EN_ON);
> +
> + pci_write_config_dword(pdev, PCI_GLI_9755_WT, wt_value);
> +}
> +
> +static inline void gl9755_wt_off(struct pci_dev *pdev)
> +{
> + u32 wt_value;
> + u32 wt_enable;
> +
> + pci_read_config_dword(pdev, PCI_GLI_9755_WT, &wt_value);
> + wt_enable = FIELD_GET(PCI_GLI_9755_WT_EN, wt_value);
> +
> + if (wt_enable == GLI_9755_WT_EN_OFF)
> + return;
> +
> + wt_value &= ~PCI_GLI_9755_WT_EN;
> + wt_value |= FIELD_PREP(PCI_GLI_9755_WT_EN, GLI_9755_WT_EN_OFF);
> +
> + pci_write_config_dword(pdev, PCI_GLI_9755_WT, wt_value);
> +}
> +
> +static void gl9755_disable_ssc_pll(struct pci_dev *pdev)
> +{
> + u32 pll;
> +
> + gl9755_wt_on(pdev);
> + pci_read_config_dword(pdev, PCI_GLI_9755_PLL, &pll);
> + pll &= ~(PCI_GLI_9755_PLL_DIR | PCI_GLI_9755_PLLSSC_EN);
> + pci_write_config_dword(pdev, PCI_GLI_9755_PLL, pll);
> + gl9755_wt_off(pdev);
> +}
> +
> +static void gl9755_set_pll(struct pci_dev *pdev, u8 dir, u16 ldiv, u8 pdiv)
> +{
> + u32 pll;
> +
> + gl9755_wt_on(pdev);
> + pci_read_config_dword(pdev, PCI_GLI_9755_PLL, &pll);
> + pll &= ~(PCI_GLI_9755_PLL_LDIV |
> + PCI_GLI_9755_PLL_PDIV |
> + PCI_GLI_9755_PLL_DIR);
> + pll |= FIELD_PREP(PCI_GLI_9755_PLL_LDIV, ldiv) |
> + FIELD_PREP(PCI_GLI_9755_PLL_PDIV, pdiv) |
> + FIELD_PREP(PCI_GLI_9755_PLL_DIR, dir);
> + pci_write_config_dword(pdev, PCI_GLI_9755_PLL, pll);
> + gl9755_wt_off(pdev);
> +
> + /* wait for pll stable */
> + mdelay(1);
> +}
> +
> +static void gl9755_set_ssc(struct pci_dev *pdev, u8 enable, u8 step, u16 ppm)
> +{
> + u32 pll;
> + u32 ssc;
> +
> + gl9755_wt_on(pdev);
> + pci_read_config_dword(pdev, PCI_GLI_9755_PLL, &pll);
> + pci_read_config_dword(pdev, PCI_GLI_9755_PLLSSC, &ssc);
> + pll &= ~(PCI_GLI_9755_PLLSSC_STEP |
> + PCI_GLI_9755_PLLSSC_EN);
> + ssc &= ~PCI_GLI_9755_PLLSSC_PPM;
> + pll |= FIELD_PREP(PCI_GLI_9755_PLLSSC_STEP, step) |
> + FIELD_PREP(PCI_GLI_9755_PLLSSC_EN, enable);
> + ssc |= FIELD_PREP(PCI_GLI_9755_PLLSSC_PPM, ppm);
> + pci_write_config_dword(pdev, PCI_GLI_9755_PLLSSC, ssc);
> + pci_write_config_dword(pdev, PCI_GLI_9755_PLL, pll);
> + gl9755_wt_off(pdev);
> +}
> +
> +static void gl9755_set_ssc_pll_205mhz(struct pci_dev *pdev)
> +{
> + /* set pll to 205MHz and enable ssc */
> + gl9755_set_ssc(pdev, 0x1, 0x1F, 0xFFE7);
> + gl9755_set_pll(pdev, 0x1, 0x246, 0x0);
> +}
> +
> +static void sdhci_gl9755_set_clock(struct sdhci_host *host, unsigned int clock)
> +{
> + struct sdhci_pci_slot *slot = sdhci_priv(host);
> + struct mmc_ios *ios = &host->mmc->ios;
> + struct pci_dev *pdev;
> + u16 clk;
> +
> + pdev = slot->chip->pdev;
> + host->mmc->actual_clock = 0;
> +
> + gl9755_disable_ssc_pll(pdev);
> + sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> +
> + if (clock == 0)
> + return;
> +
> + clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
> + if (clock == 200000000 && ios->timing == MMC_TIMING_UHS_SDR104) {
> + host->mmc->actual_clock = 205000000;
> + gl9755_set_ssc_pll_205mhz(pdev);
> + }
> +
> + sdhci_enable_clk(host, clk);
> +}
> +
> static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
> {
> struct sdhci_host *host = slot->host;
> @@ -440,7 +656,7 @@ static int gli_probe_slot_gl9763e(struct sdhci_pci_slot *slot)
> }
>
> static const struct sdhci_ops sdhci_gl9755_ops = {
> - .set_clock = sdhci_set_clock,
> + .set_clock = sdhci_gl9755_set_clock,
> .enable_dma = sdhci_pci_enable_dma,
> .set_bus_width = sdhci_set_bus_width,
> .reset = sdhci_reset,
> @@ -460,7 +676,7 @@ const struct sdhci_pci_fixes sdhci_gl9755 = {
>
> static const struct sdhci_ops sdhci_gl9750_ops = {
> .read_l = sdhci_gl9750_readl,
> - .set_clock = sdhci_set_clock,
> + .set_clock = sdhci_gl9750_set_clock,
> .enable_dma = sdhci_pci_enable_dma,
> .set_bus_width = sdhci_set_bus_width,
> .reset = sdhci_gl9750_reset,
> --
> 2.27.0
>

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