diff options
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/meson-gx-mmc.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 3a6e51c8c5d2..eb5ee68dbd46 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -349,6 +349,31 @@ static int meson_mmc_clk_init(struct meson_host *host) return ret; } +static void meson_mmc_set_tuning_params(struct mmc_host *mmc) +{ + struct meson_host *host = mmc_priv(mmc); + u32 regval; + + /* stop clock */ + regval = readl(host->regs + SD_EMMC_CFG); + regval |= CFG_STOP_CLOCK; + writel(regval, host->regs + SD_EMMC_CFG); + + regval = readl(host->regs + SD_EMMC_CLOCK); + regval &= ~CLK_CORE_PHASE_MASK; + regval |= FIELD_PREP(CLK_CORE_PHASE_MASK, host->tp.core_phase); + regval &= ~CLK_TX_PHASE_MASK; + regval |= FIELD_PREP(CLK_TX_PHASE_MASK, host->tp.tx_phase); + regval &= ~CLK_RX_PHASE_MASK; + regval |= FIELD_PREP(CLK_RX_PHASE_MASK, host->tp.rx_phase); + writel(regval, host->regs + SD_EMMC_CLOCK); + + /* start clock */ + regval = readl(host->regs + SD_EMMC_CFG); + regval &= ~CFG_STOP_CLOCK; + writel(regval, host->regs + SD_EMMC_CFG); +} + static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct meson_host *host = mmc_priv(mmc); @@ -682,6 +707,29 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id) return IRQ_HANDLED; } +static int meson_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + struct meson_host *host = mmc_priv(mmc); + struct meson_tuning_params tp_old = host->tp; + int ret = -EINVAL, i, cmd_error; + + dev_info(mmc_dev(mmc), "(re)tuning...\n"); + + for (i = CLK_PHASE_0; i <= CLK_PHASE_270; i++) { + host->tp.rx_phase = i; + /* exclude the active parameter set if retuning */ + if (!memcmp(&tp_old, &host->tp, sizeof(tp_old)) && + mmc->doing_retune) + continue; + meson_mmc_set_tuning_params(mmc); + ret = mmc_send_tuning(mmc, opcode, &cmd_error); + if (!ret) + break; + } + + return ret; +} + /* * NOTE: we only need this until the GPIO/pinctrl driver can handle * interrupts. For now, the MMC core will use this for polling. @@ -712,6 +760,7 @@ static const struct mmc_host_ops meson_mmc_ops = { .request = meson_mmc_request, .set_ios = meson_mmc_set_ios, .get_cd = meson_mmc_get_cd, + .execute_tuning = meson_mmc_execute_tuning, }; static int meson_mmc_probe(struct platform_device *pdev) |