V2 main changes: - Add Rob's reviewed-by in the binding patch. - Re-name the error out labels and new RXWM macro. - In #3 patch, add one fix tag, and CC stable kernel.
Based on i.MX8QM HSIO PHY driver, refine i.MX8QM SATA driver by using PHY interface.
[PATCH v2 1/4] dt-bindings: ata: Add i.MX8QM AHCI compatible string [PATCH v2 2/4] ata: ahci_imx: Clean up code by using i.MX8Q HSIO PHY [PATCH v2 3/4] ata: ahci_imx: Enlarge RX water mark for i.MX8QM SATA [PATCH v2 4/4] ata: ahci_imx: Correct the email address
Documentation/devicetree/bindings/ata/imx-sata.yaml | 47 +++++++++++ drivers/ata/ahci_imx.c | 406 ++++++++++++++++++++++++----------------------------------------------------------------- 2 files changed, 155 insertions(+), 298 deletions(-)
Add i.MX8QM AHCI "fsl,imx8qm-ahci" compatible strings.
i.MX8QM AHCI SATA doesn't require AHB clock rate to set the vendor specified TIMER1MS register. ahb clock is not required by i.MX8QM AHCI.
Update the description of clocks in the dt-binding accordingly.
Signed-off-by: Richard Zhu hongxing.zhu@nxp.com Reviewed-by: Rob Herring (Arm) robh@kernel.org --- .../devicetree/bindings/ata/imx-sata.yaml | 47 +++++++++++++++++++ 1 file changed, 47 insertions(+)
diff --git a/Documentation/devicetree/bindings/ata/imx-sata.yaml b/Documentation/devicetree/bindings/ata/imx-sata.yaml index 68ffb97ddc9b2..f4eb3550a0960 100644 --- a/Documentation/devicetree/bindings/ata/imx-sata.yaml +++ b/Documentation/devicetree/bindings/ata/imx-sata.yaml @@ -19,6 +19,7 @@ properties: - fsl,imx53-ahci - fsl,imx6q-ahci - fsl,imx6qp-ahci + - fsl,imx8qm-ahci
reg: maxItems: 1 @@ -27,12 +28,14 @@ properties: maxItems: 1
clocks: + minItems: 2 items: - description: sata clock - description: sata reference clock - description: ahb clock
clock-names: + minItems: 2 items: - const: sata - const: sata_ref @@ -58,6 +61,25 @@ properties: $ref: /schemas/types.yaml#/definitions/flag description: if present, disable spread-spectrum clocking on the SATA link.
+ phys: + items: + - description: phandle to SATA PHY. + Since "REXT" pin is only present for first lane of i.MX8QM PHY, it's + calibration result will be stored, passed through second lane, and + shared with all three lanes PHY. The first two lanes PHY are used as + calibration PHYs, although only the third lane PHY is used by SATA. + - description: phandle to the first lane PHY of i.MX8QM. + - description: phandle to the second lane PHY of i.MX8QM. + + phy-names: + items: + - const: sata-phy + - const: cali-phy0 + - const: cali-phy1 + + power-domains: + maxItems: 1 + required: - compatible - reg @@ -65,6 +87,31 @@ required: - clocks - clock-names
+allOf: + - if: + properties: + compatible: + contains: + enum: + - fsl,imx53-ahci + - fsl,imx6q-ahci + - fsl,imx6qp-ahci + then: + properties: + clock-names: + minItems: 3 + + - if: + properties: + compatible: + contains: + enum: + - fsl,imx8qm-ahci + then: + properties: + clock-names: + minItems: 2 + additionalProperties: false
examples:
Hi,
Thanks for your patch.
FYI: kernel test robot notices the stable kernel rule is not satisfied.
The check is based on https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html#opti...
Rule: add the tag "Cc: stable@vger.kernel.org" in the sign-off area to have the patch automatically included in the stable tree. Subject: [PATCH v2 1/4] dt-bindings: ata: Add i.MX8QM AHCI compatible string Link: https://lore.kernel.org/stable/1721008436-24288-2-git-send-email-hongxing.zh...
Clean up code by using PHY interface.
Signed-off-by: Richard Zhu hongxing.zhu@nxp.com --- drivers/ata/ahci_imx.c | 396 ++++++++++------------------------------- 1 file changed, 98 insertions(+), 298 deletions(-)
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c index cb768f66f0a70..e94c0fdea2260 100644 --- a/drivers/ata/ahci_imx.c +++ b/drivers/ata/ahci_imx.c @@ -19,6 +19,7 @@ #include <linux/libata.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> +#include <linux/phy/phy.h> #include <linux/thermal.h> #include "ahci.h"
@@ -44,42 +45,6 @@ enum { /* Clock Reset Register */ IMX_CLOCK_RESET = 0x7f3f, IMX_CLOCK_RESET_RESET = 1 << 0, - /* IMX8QM HSIO AHCI definitions */ - IMX8QM_SATA_PHY_RX_IMPED_RATIO_OFFSET = 0x03, - IMX8QM_SATA_PHY_TX_IMPED_RATIO_OFFSET = 0x09, - IMX8QM_SATA_PHY_IMPED_RATIO_85OHM = 0x6c, - IMX8QM_LPCG_PHYX2_OFFSET = 0x00000, - IMX8QM_CSR_PHYX2_OFFSET = 0x90000, - IMX8QM_CSR_PHYX1_OFFSET = 0xa0000, - IMX8QM_CSR_PHYX_STTS0_OFFSET = 0x4, - IMX8QM_CSR_PCIEA_OFFSET = 0xb0000, - IMX8QM_CSR_PCIEB_OFFSET = 0xc0000, - IMX8QM_CSR_SATA_OFFSET = 0xd0000, - IMX8QM_CSR_PCIE_CTRL2_OFFSET = 0x8, - IMX8QM_CSR_MISC_OFFSET = 0xe0000, - - IMX8QM_LPCG_PHYX2_PCLK0_MASK = (0x3 << 16), - IMX8QM_LPCG_PHYX2_PCLK1_MASK = (0x3 << 20), - IMX8QM_PHY_APB_RSTN_0 = BIT(0), - IMX8QM_PHY_MODE_SATA = BIT(19), - IMX8QM_PHY_MODE_MASK = (0xf << 17), - IMX8QM_PHY_PIPE_RSTN_0 = BIT(24), - IMX8QM_PHY_PIPE_RSTN_OVERRIDE_0 = BIT(25), - IMX8QM_PHY_PIPE_RSTN_1 = BIT(26), - IMX8QM_PHY_PIPE_RSTN_OVERRIDE_1 = BIT(27), - IMX8QM_STTS0_LANE0_TX_PLL_LOCK = BIT(4), - IMX8QM_MISC_IOB_RXENA = BIT(0), - IMX8QM_MISC_IOB_TXENA = BIT(1), - IMX8QM_MISC_PHYX1_EPCS_SEL = BIT(12), - IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_1 = BIT(24), - IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_0 = BIT(25), - IMX8QM_MISC_CLKREQN_IN_OVERRIDE_1 = BIT(28), - IMX8QM_MISC_CLKREQN_IN_OVERRIDE_0 = BIT(29), - IMX8QM_SATA_CTRL_RESET_N = BIT(12), - IMX8QM_SATA_CTRL_EPCS_PHYRESET_N = BIT(7), - IMX8QM_CTRL_BUTTON_RST_N = BIT(21), - IMX8QM_CTRL_POWER_UP_RST_N = BIT(23), - IMX8QM_CTRL_LTSSM_ENABLE = BIT(4), };
enum ahci_imx_type { @@ -95,14 +60,10 @@ struct imx_ahci_priv { struct clk *sata_clk; struct clk *sata_ref_clk; struct clk *ahb_clk; - struct clk *epcs_tx_clk; - struct clk *epcs_rx_clk; - struct clk *phy_apbclk; - struct clk *phy_pclk0; - struct clk *phy_pclk1; - void __iomem *phy_base; - struct gpio_desc *clkreq_gpiod; struct regmap *gpr; + struct phy *sata_phy; + struct phy *cali_phy0; + struct phy *cali_phy1; bool no_device; bool first_time; u32 phy_params; @@ -450,201 +411,73 @@ ATTRIBUTE_GROUPS(fsl_sata_ahci);
static int imx8_sata_enable(struct ahci_host_priv *hpriv) { - u32 val, reg; - int i, ret; + u32 val; + int ret; struct imx_ahci_priv *imxpriv = hpriv->plat_data; struct device *dev = &imxpriv->ahci_pdev->dev;
- /* configure the hsio for sata */ - ret = clk_prepare_enable(imxpriv->phy_pclk0); - if (ret < 0) { - dev_err(dev, "can't enable phy_pclk0.\n"); + /* + * Since "REXT" pin is only present for first lane of i.MX8QM + * PHY, its calibration results will be stored, passed through + * to the second lane PHY, and shared with all three lane PHYs. + * + * Initialize the first two lane PHYs here, although only the + * third lane PHY is used by SATA. + */ + ret = phy_init(imxpriv->cali_phy0); + if (ret) { + dev_err(dev, "cali PHY init failed\n"); return ret; } - ret = clk_prepare_enable(imxpriv->phy_pclk1); - if (ret < 0) { - dev_err(dev, "can't enable phy_pclk1.\n"); - goto disable_phy_pclk0; + ret = phy_power_on(imxpriv->cali_phy0); + if (ret) { + dev_err(dev, "cali PHY power on failed\n"); + goto err_cali_phy0_exit; } - ret = clk_prepare_enable(imxpriv->epcs_tx_clk); - if (ret < 0) { - dev_err(dev, "can't enable epcs_tx_clk.\n"); - goto disable_phy_pclk1; + ret = phy_init(imxpriv->cali_phy1); + if (ret) { + dev_err(dev, "cali PHY1 init failed\n"); + goto err_cali_phy0_off; } - ret = clk_prepare_enable(imxpriv->epcs_rx_clk); - if (ret < 0) { - dev_err(dev, "can't enable epcs_rx_clk.\n"); - goto disable_epcs_tx_clk; + ret = phy_power_on(imxpriv->cali_phy1); + if (ret) { + dev_err(dev, "cali PHY1 power on failed\n"); + goto err_cali_phy1_exit; } - ret = clk_prepare_enable(imxpriv->phy_apbclk); - if (ret < 0) { - dev_err(dev, "can't enable phy_apbclk.\n"); - goto disable_epcs_rx_clk; + ret = phy_init(imxpriv->sata_phy); + if (ret) { + dev_err(dev, "sata PHY init failed\n"); + goto err_cali_phy1_off; } - /* Configure PHYx2 PIPE_RSTN */ - regmap_read(imxpriv->gpr, IMX8QM_CSR_PCIEA_OFFSET + - IMX8QM_CSR_PCIE_CTRL2_OFFSET, &val); - if ((val & IMX8QM_CTRL_LTSSM_ENABLE) == 0) { - /* The link of the PCIEA of HSIO is down */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_PHYX2_OFFSET, - IMX8QM_PHY_PIPE_RSTN_0 | - IMX8QM_PHY_PIPE_RSTN_OVERRIDE_0, - IMX8QM_PHY_PIPE_RSTN_0 | - IMX8QM_PHY_PIPE_RSTN_OVERRIDE_0); + ret = phy_set_mode(imxpriv->sata_phy, PHY_MODE_SATA); + if (ret) { + dev_err(dev, "unable to set SATA PHY mode\n"); + goto err_sata_phy_exit; } - regmap_read(imxpriv->gpr, IMX8QM_CSR_PCIEB_OFFSET + - IMX8QM_CSR_PCIE_CTRL2_OFFSET, ®); - if ((reg & IMX8QM_CTRL_LTSSM_ENABLE) == 0) { - /* The link of the PCIEB of HSIO is down */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_PHYX2_OFFSET, - IMX8QM_PHY_PIPE_RSTN_1 | - IMX8QM_PHY_PIPE_RSTN_OVERRIDE_1, - IMX8QM_PHY_PIPE_RSTN_1 | - IMX8QM_PHY_PIPE_RSTN_OVERRIDE_1); - } - if (((reg | val) & IMX8QM_CTRL_LTSSM_ENABLE) == 0) { - /* The links of both PCIA and PCIEB of HSIO are down */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_LPCG_PHYX2_OFFSET, - IMX8QM_LPCG_PHYX2_PCLK0_MASK | - IMX8QM_LPCG_PHYX2_PCLK1_MASK, - 0); - } - - /* set PWR_RST and BT_RST of csr_pciea */ - val = IMX8QM_CSR_PCIEA_OFFSET + IMX8QM_CSR_PCIE_CTRL2_OFFSET; - regmap_update_bits(imxpriv->gpr, - val, - IMX8QM_CTRL_BUTTON_RST_N, - IMX8QM_CTRL_BUTTON_RST_N); - regmap_update_bits(imxpriv->gpr, - val, - IMX8QM_CTRL_POWER_UP_RST_N, - IMX8QM_CTRL_POWER_UP_RST_N); - - /* PHYX1_MODE to SATA */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_PHYX1_OFFSET, - IMX8QM_PHY_MODE_MASK, - IMX8QM_PHY_MODE_SATA); - - /* - * BIT0 RXENA 1, BIT1 TXENA 0 - * BIT12 PHY_X1_EPCS_SEL 1. - */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_MISC_OFFSET, - IMX8QM_MISC_IOB_RXENA, - IMX8QM_MISC_IOB_RXENA); - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_MISC_OFFSET, - IMX8QM_MISC_IOB_TXENA, - 0); - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_MISC_OFFSET, - IMX8QM_MISC_PHYX1_EPCS_SEL, - IMX8QM_MISC_PHYX1_EPCS_SEL); - /* - * It is possible, for PCIe and SATA are sharing - * the same clock source, HPLL or external oscillator. - * When PCIe is in low power modes (L1.X or L2 etc), - * the clock source can be turned off. In this case, - * if this clock source is required to be toggling by - * SATA, then SATA functions will be abnormal. - * Set the override here to avoid it. - */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_MISC_OFFSET, - IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_1 | - IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_0 | - IMX8QM_MISC_CLKREQN_IN_OVERRIDE_1 | - IMX8QM_MISC_CLKREQN_IN_OVERRIDE_0, - IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_1 | - IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_0 | - IMX8QM_MISC_CLKREQN_IN_OVERRIDE_1 | - IMX8QM_MISC_CLKREQN_IN_OVERRIDE_0); - - /* clear PHY RST, then set it */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_SATA_OFFSET, - IMX8QM_SATA_CTRL_EPCS_PHYRESET_N, - 0); - - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_SATA_OFFSET, - IMX8QM_SATA_CTRL_EPCS_PHYRESET_N, - IMX8QM_SATA_CTRL_EPCS_PHYRESET_N); - - /* CTRL RST: SET -> delay 1 us -> CLEAR -> SET */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_SATA_OFFSET, - IMX8QM_SATA_CTRL_RESET_N, - IMX8QM_SATA_CTRL_RESET_N); - udelay(1); - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_SATA_OFFSET, - IMX8QM_SATA_CTRL_RESET_N, - 0); - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_SATA_OFFSET, - IMX8QM_SATA_CTRL_RESET_N, - IMX8QM_SATA_CTRL_RESET_N); - - /* APB reset */ - regmap_update_bits(imxpriv->gpr, - IMX8QM_CSR_PHYX1_OFFSET, - IMX8QM_PHY_APB_RSTN_0, - IMX8QM_PHY_APB_RSTN_0); - - for (i = 0; i < 100; i++) { - reg = IMX8QM_CSR_PHYX1_OFFSET + - IMX8QM_CSR_PHYX_STTS0_OFFSET; - regmap_read(imxpriv->gpr, reg, &val); - val &= IMX8QM_STTS0_LANE0_TX_PLL_LOCK; - if (val == IMX8QM_STTS0_LANE0_TX_PLL_LOCK) - break; - udelay(1); + ret = phy_power_on(imxpriv->sata_phy); + if (ret) { + dev_err(dev, "sata PHY power up failed\n"); + goto err_sata_phy_exit; }
- if (val != IMX8QM_STTS0_LANE0_TX_PLL_LOCK) { - dev_err(dev, "TX PLL of the PHY is not locked\n"); - ret = -ENODEV; - } else { - writeb(imxpriv->imped_ratio, imxpriv->phy_base + - IMX8QM_SATA_PHY_RX_IMPED_RATIO_OFFSET); - writeb(imxpriv->imped_ratio, imxpriv->phy_base + - IMX8QM_SATA_PHY_TX_IMPED_RATIO_OFFSET); - reg = readb(imxpriv->phy_base + - IMX8QM_SATA_PHY_RX_IMPED_RATIO_OFFSET); - if (unlikely(reg != imxpriv->imped_ratio)) - dev_info(dev, "Can't set PHY RX impedance ratio.\n"); - reg = readb(imxpriv->phy_base + - IMX8QM_SATA_PHY_TX_IMPED_RATIO_OFFSET); - if (unlikely(reg != imxpriv->imped_ratio)) - dev_info(dev, "Can't set PHY TX impedance ratio.\n"); - usleep_range(50, 100); + /* The cali_phy# can be turned off after SATA PHY is initialized. */ + phy_power_off(imxpriv->cali_phy1); + phy_exit(imxpriv->cali_phy1); + phy_power_off(imxpriv->cali_phy0); + phy_exit(imxpriv->cali_phy0);
- /* - * To reduce the power consumption, gate off - * the PHY clks - */ - clk_disable_unprepare(imxpriv->phy_apbclk); - clk_disable_unprepare(imxpriv->phy_pclk1); - clk_disable_unprepare(imxpriv->phy_pclk0); - return ret; - } + return 0;
- clk_disable_unprepare(imxpriv->phy_apbclk); -disable_epcs_rx_clk: - clk_disable_unprepare(imxpriv->epcs_rx_clk); -disable_epcs_tx_clk: - clk_disable_unprepare(imxpriv->epcs_tx_clk); -disable_phy_pclk1: - clk_disable_unprepare(imxpriv->phy_pclk1); -disable_phy_pclk0: - clk_disable_unprepare(imxpriv->phy_pclk0); +err_sata_phy_exit: + phy_exit(imxpriv->sata_phy); +err_cali_phy1_off: + phy_power_off(imxpriv->cali_phy1); +err_cali_phy1_exit: + phy_exit(imxpriv->cali_phy1); +err_cali_phy0_off: + phy_power_off(imxpriv->cali_phy0); +err_cali_phy0_exit: + phy_exit(imxpriv->cali_phy0);
return ret; } @@ -698,6 +531,9 @@ static int imx_sata_enable(struct ahci_host_priv *hpriv) } } else if (imxpriv->type == AHCI_IMX8QM) { ret = imx8_sata_enable(hpriv); + if (ret) + goto disable_clk; + }
usleep_range(1000, 2000); @@ -736,8 +572,10 @@ static void imx_sata_disable(struct ahci_host_priv *hpriv) break;
case AHCI_IMX8QM: - clk_disable_unprepare(imxpriv->epcs_rx_clk); - clk_disable_unprepare(imxpriv->epcs_tx_clk); + if (imxpriv->sata_phy) { + phy_power_off(imxpriv->sata_phy); + phy_exit(imxpriv->sata_phy); + } break;
default: @@ -760,6 +598,9 @@ static void ahci_imx_error_handler(struct ata_port *ap)
ahci_error_handler(ap);
+ if (imxpriv->type == AHCI_IMX8QM) + return; + if (!(imxpriv->first_time) || ahci_imx_hotplug) return;
@@ -986,65 +827,22 @@ static const struct scsi_host_template ahci_platform_sht = {
static int imx8_sata_probe(struct device *dev, struct imx_ahci_priv *imxpriv) { - struct resource *phy_res; - struct platform_device *pdev = imxpriv->ahci_pdev; - struct device_node *np = dev->of_node; - - if (of_property_read_u32(np, "fsl,phy-imp", &imxpriv->imped_ratio)) - imxpriv->imped_ratio = IMX8QM_SATA_PHY_IMPED_RATIO_85OHM; - phy_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy"); - if (phy_res) { - imxpriv->phy_base = devm_ioremap(dev, phy_res->start, - resource_size(phy_res)); - if (!imxpriv->phy_base) { - dev_err(dev, "error with ioremap\n"); - return -ENOMEM; - } - } else { - dev_err(dev, "missing *phy* reg region.\n"); - return -ENOMEM; - } - imxpriv->gpr = - syscon_regmap_lookup_by_phandle(np, "hsio"); - if (IS_ERR(imxpriv->gpr)) { - dev_err(dev, "unable to find gpr registers\n"); - return PTR_ERR(imxpriv->gpr); - } - - imxpriv->epcs_tx_clk = devm_clk_get(dev, "epcs_tx"); - if (IS_ERR(imxpriv->epcs_tx_clk)) { - dev_err(dev, "can't get epcs_tx_clk clock.\n"); - return PTR_ERR(imxpriv->epcs_tx_clk); - } - imxpriv->epcs_rx_clk = devm_clk_get(dev, "epcs_rx"); - if (IS_ERR(imxpriv->epcs_rx_clk)) { - dev_err(dev, "can't get epcs_rx_clk clock.\n"); - return PTR_ERR(imxpriv->epcs_rx_clk); - } - imxpriv->phy_pclk0 = devm_clk_get(dev, "phy_pclk0"); - if (IS_ERR(imxpriv->phy_pclk0)) { - dev_err(dev, "can't get phy_pclk0 clock.\n"); - return PTR_ERR(imxpriv->phy_pclk0); - } - imxpriv->phy_pclk1 = devm_clk_get(dev, "phy_pclk1"); - if (IS_ERR(imxpriv->phy_pclk1)) { - dev_err(dev, "can't get phy_pclk1 clock.\n"); - return PTR_ERR(imxpriv->phy_pclk1); - } - imxpriv->phy_apbclk = devm_clk_get(dev, "phy_apbclk"); - if (IS_ERR(imxpriv->phy_apbclk)) { - dev_err(dev, "can't get phy_apbclk clock.\n"); - return PTR_ERR(imxpriv->phy_apbclk); - } - - /* Fetch GPIO, then enable the external OSC */ - imxpriv->clkreq_gpiod = devm_gpiod_get_optional(dev, "clkreq", - GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE); - if (IS_ERR(imxpriv->clkreq_gpiod)) - return PTR_ERR(imxpriv->clkreq_gpiod); - if (imxpriv->clkreq_gpiod) - gpiod_set_consumer_name(imxpriv->clkreq_gpiod, "SATA CLKREQ"); - + if (!(dev->bus_dma_limit)) + dev->bus_dma_limit = DMA_BIT_MASK(32); + + imxpriv->sata_phy = devm_phy_get(dev, "sata-phy"); + if (IS_ERR(imxpriv->sata_phy)) + return dev_err_probe(dev, PTR_ERR(imxpriv->sata_phy), + "Failed to get sata_phy\n"); + + imxpriv->cali_phy0 = devm_phy_get(dev, "cali-phy0"); + if (IS_ERR(imxpriv->cali_phy0)) + return dev_err_probe(dev, PTR_ERR(imxpriv->cali_phy0), + "Failed to get cali_phy0\n"); + imxpriv->cali_phy1 = devm_phy_get(dev, "cali-phy1"); + if (IS_ERR(imxpriv->cali_phy1)) + return dev_err_probe(dev, PTR_ERR(imxpriv->cali_phy1), + "Failed to get cali_phy1\n"); return 0; }
@@ -1077,12 +875,6 @@ static int imx_ahci_probe(struct platform_device *pdev) return PTR_ERR(imxpriv->sata_ref_clk); }
- imxpriv->ahb_clk = devm_clk_get(dev, "ahb"); - if (IS_ERR(imxpriv->ahb_clk)) { - dev_err(dev, "can't get ahb clock.\n"); - return PTR_ERR(imxpriv->ahb_clk); - } - if (imxpriv->type == AHCI_IMX6Q || imxpriv->type == AHCI_IMX6QP) { u32 reg_value;
@@ -1142,11 +934,8 @@ static int imx_ahci_probe(struct platform_device *pdev) goto disable_clk;
/* - * Configure the HWINIT bits of the HOST_CAP and HOST_PORTS_IMPL, - * and IP vendor specific register IMX_TIMER1MS. - * Configure CAP_SSS (support stagered spin up). - * Implement the port0. - * Get the ahb clock rate, and configure the TIMER1MS register. + * Configure the HWINIT bits of the HOST_CAP and HOST_PORTS_IMPL. + * Set CAP_SSS (support stagered spin up) and Implement the port0. */ reg_val = readl(hpriv->mmio + HOST_CAP); if (!(reg_val & HOST_CAP_SSS)) { @@ -1159,8 +948,19 @@ static int imx_ahci_probe(struct platform_device *pdev) writel(reg_val, hpriv->mmio + HOST_PORTS_IMPL); }
- reg_val = clk_get_rate(imxpriv->ahb_clk) / 1000; - writel(reg_val, hpriv->mmio + IMX_TIMER1MS); + if (imxpriv->type != AHCI_IMX8QM) { + /* + * Get AHB clock rate and configure the vendor specified + * TIMER1MS register on i.MX53, i.MX6Q and i.MX6QP only. + */ + imxpriv->ahb_clk = devm_clk_get(dev, "ahb"); + if (IS_ERR(imxpriv->ahb_clk)) { + dev_err(dev, "Failed to get ahb clock\n"); + goto disable_sata; + } + reg_val = clk_get_rate(imxpriv->ahb_clk) / 1000; + writel(reg_val, hpriv->mmio + IMX_TIMER1MS); + }
ret = ahci_platform_init_host(pdev, hpriv, &ahci_imx_port_info, &ahci_platform_sht);
The RXWM(RxWaterMark) sets the minimum number of free location within the RX FIFO before the watermark is exceeded which in turn will cause the Transport Layer to instruct the Link Layer to transmit HOLDS to the transmitting end.
Based on the default RXWM value 0x20, RX FIFO overflow might be observed on i.MX8QM MEK board, when some Gen3 SATA disks are used.
The FIFO overflow will result in CRC error, internal error and protocol error, then the SATA link is not stable anymore.
To fix this issue, enlarge RX water mark setting from 0x20 to 0x29.
Fixes: 027fa4dee935 ("ahci: imx: add the imx8qm ahci sata support") Cc: stable@vger.kernel.org Signed-off-by: Richard Zhu hongxing.zhu@nxp.com --- drivers/ata/ahci_imx.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c index e94c0fdea2260..12d69a6429b6a 100644 --- a/drivers/ata/ahci_imx.c +++ b/drivers/ata/ahci_imx.c @@ -45,6 +45,10 @@ enum { /* Clock Reset Register */ IMX_CLOCK_RESET = 0x7f3f, IMX_CLOCK_RESET_RESET = 1 << 0, + /* IMX8QM SATA specific control registers */ + IMX8QM_SATA_AHCI_VEND_PTC = 0xc8, + IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK = 0x7f, + IMX8QM_SATA_AHCI_VEND_PTC_NEWRXWM = 0x29, };
enum ahci_imx_type { @@ -466,6 +470,12 @@ static int imx8_sata_enable(struct ahci_host_priv *hpriv) phy_power_off(imxpriv->cali_phy0); phy_exit(imxpriv->cali_phy0);
+ /* RxWaterMark setting */ + val = readl(hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC); + val &= ~IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK; + val |= IMX8QM_SATA_AHCI_VEND_PTC_NEWRXWM; + writel(val, hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC); + return 0;
err_sata_phy_exit:
On 7/15/24 10:53, Richard Zhu wrote:
The RXWM(RxWaterMark) sets the minimum number of free location within the RX FIFO before the watermark is exceeded which in turn will cause the Transport Layer to instruct the Link Layer to transmit HOLDS to the transmitting end.
Based on the default RXWM value 0x20, RX FIFO overflow might be observed on i.MX8QM MEK board, when some Gen3 SATA disks are used.
The FIFO overflow will result in CRC error, internal error and protocol error, then the SATA link is not stable anymore.
To fix this issue, enlarge RX water mark setting from 0x20 to 0x29.
Fixes: 027fa4dee935 ("ahci: imx: add the imx8qm ahci sata support") Cc: stable@vger.kernel.org Signed-off-by: Richard Zhu hongxing.zhu@nxp.com
drivers/ata/ahci_imx.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c index e94c0fdea2260..12d69a6429b6a 100644 --- a/drivers/ata/ahci_imx.c +++ b/drivers/ata/ahci_imx.c @@ -45,6 +45,10 @@ enum { /* Clock Reset Register */ IMX_CLOCK_RESET = 0x7f3f, IMX_CLOCK_RESET_RESET = 1 << 0,
- /* IMX8QM SATA specific control registers */
- IMX8QM_SATA_AHCI_VEND_PTC = 0xc8,
- IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK = 0x7f,
Please use GENMASK() macro to define this.
- IMX8QM_SATA_AHCI_VEND_PTC_NEWRXWM = 0x29,
Here too. And I do not see the point of the "NEW" in the macro name.
Also, what is "_VEND_" supposed to mean in the macro names ? "Vendor" ? If that is the case, remove that too, which will give you shorter macro names. If not, then spell it out because that is not clear.
}; enum ahci_imx_type { @@ -466,6 +470,12 @@ static int imx8_sata_enable(struct ahci_host_priv *hpriv) phy_power_off(imxpriv->cali_phy0); phy_exit(imxpriv->cali_phy0);
- /* RxWaterMark setting */
- val = readl(hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC);
- val &= ~IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK;
- val |= IMX8QM_SATA_AHCI_VEND_PTC_NEWRXWM;
- writel(val, hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC);
- return 0;
err_sata_phy_exit:
-----Original Message----- From: Damien Le Moal dlemoal@kernel.org Sent: 2024年7月16日 6:01 To: Hongxing Zhu hongxing.zhu@nxp.com; tj@kernel.org; cassel@kernel.org; robh@kernel.org; krzk+dt@kernel.org; conor+dt@kernel.org; shawnguo@kernel.org; s.hauer@pengutronix.de; festevam@gmail.com Cc: linux-ide@vger.kernel.org; stable@vger.kernel.org; devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; imx@lists.linux.dev; kernel@pengutronix.de Subject: Re: [PATCH v2 3/4] ata: ahci_imx: Enlarge RX water mark for i.MX8QM SATA
On 7/15/24 10:53, Richard Zhu wrote:
The RXWM(RxWaterMark) sets the minimum number of free location within the RX FIFO before the watermark is exceeded which in turn will cause the Transport Layer to instruct the Link Layer to transmit HOLDS to the transmitting end.
Based on the default RXWM value 0x20, RX FIFO overflow might be observed on i.MX8QM MEK board, when some Gen3 SATA disks are used.
The FIFO overflow will result in CRC error, internal error and protocol error, then the SATA link is not stable anymore.
To fix this issue, enlarge RX water mark setting from 0x20 to 0x29.
Fixes: 027fa4dee935 ("ahci: imx: add the imx8qm ahci sata support") Cc: stable@vger.kernel.org Signed-off-by: Richard Zhu hongxing.zhu@nxp.com
drivers/ata/ahci_imx.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c index e94c0fdea2260..12d69a6429b6a 100644 --- a/drivers/ata/ahci_imx.c +++ b/drivers/ata/ahci_imx.c @@ -45,6 +45,10 @@ enum { /* Clock Reset Register */ IMX_CLOCK_RESET = 0x7f3f, IMX_CLOCK_RESET_RESET = 1 << 0,
- /* IMX8QM SATA specific control registers */
- IMX8QM_SATA_AHCI_VEND_PTC = 0xc8,
- IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK = 0x7f,
Please use GENMASK() macro to define this.
Thanks for your comments. Okay.
- IMX8QM_SATA_AHCI_VEND_PTC_NEWRXWM = 0x29,
Here too. And I do not see the point of the "NEW" in the macro name.
Okay, "NEW" would be removed.
Also, what is "_VEND_" supposed to mean in the macro names ? "Vendor" ? If that is the case, remove that too, which will give you shorter macro names. If not, then spell it out because that is not clear.
Yes, you're right. "_VEND_" means "Vendor". I would remove them later.
Best Regards Richard Zhu
};
enum ahci_imx_type { @@ -466,6 +470,12 @@ static int imx8_sata_enable(struct ahci_host_priv
*hpriv)
phy_power_off(imxpriv->cali_phy0); phy_exit(imxpriv->cali_phy0);
- /* RxWaterMark setting */
- val = readl(hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC);
- val &= ~IMX8QM_SATA_AHCI_VEND_PTC_RXWM_MASK;
- val |= IMX8QM_SATA_AHCI_VEND_PTC_NEWRXWM;
- writel(val, hpriv->mmio + IMX8QM_SATA_AHCI_VEND_PTC);
- return 0;
err_sata_phy_exit:
-- Damien Le Moal Western Digital Research
Correct the email address of driver author.
Signed-off-by: Richard Zhu hongxing.zhu@nxp.com --- drivers/ata/ahci_imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c index 12d69a6429b6a..c909668bf7204 100644 --- a/drivers/ata/ahci_imx.c +++ b/drivers/ata/ahci_imx.c @@ -1039,6 +1039,6 @@ static struct platform_driver imx_ahci_driver = { module_platform_driver(imx_ahci_driver);
MODULE_DESCRIPTION("Freescale i.MX AHCI SATA platform driver"); -MODULE_AUTHOR("Richard Zhu Hong-Xing.Zhu@freescale.com"); +MODULE_AUTHOR("Richard Zhu hongxing.zhu@nxp.com"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRV_NAME);
linux-stable-mirror@lists.linaro.org
-
Damien Le Moal -
Hongxing Zhu -
kernel test robot -
Richard Zhu