On Wednesday 12 June 2013 08:07 PM, Tony Lindgren wrote:
* Balaji T K <balajitk@xxxxxx> [130606 12:20]:PBIAS register configuration is based on the regulator voltage which supplies these pbias cells, sd i/o pads. With PBIAS register address and bit definitions different across omap[3,4,5], Simplify PBIAS configuration under three different regulator voltage levels - O V, 1.8 V, 3 V. Corresponding pinctrl states are defined as pbias_off, pbias_1v8, pbias_3v. pinctrl state mmc_init is used for configuring speed mode, loopback clock (in devconf0/devconf1/prog_io1 register for omap3) and pull strength configuration (in control_mmc1 for omap4) Signed-off-by: Balaji T K <balajitk@xxxxxx> --- drivers/mmc/host/omap_hsmmc.c | 83 ++++++++++++++++++++++++++++++++++++++-- 1 files changed, 78 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 533ced2..8dd1cd3 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -182,6 +182,9 @@ struct omap_hsmmc_host { int req_in_progress; struct omap_hsmmc_next next_data; + struct pinctrl *pinctrl; + struct pinctrl_state *pbias_off, *pbias_1v8, *pbias_3v, *mmc_init; + struct omap_mmc_platform_data *pdata; int needs_vmmc:1; int needs_vmmc_aux:1; @@ -267,6 +270,12 @@ static int omap_hsmmc_set_power(struct device *dev, int slot, int power_on, if (mmc_slot(host).before_set_reg) mmc_slot(host).before_set_reg(dev, slot, power_on, vdd); + if (host->pinctrl && host->pbias_off) { + ret = pinctrl_select_state(host->pinctrl, host->pbias_off); + if (ret < 0) + dev_err(host->dev, "pinctrl pbias_off select error\n"); + } + /* * Assume Vcc regulator is used only to power the card ... OMAP * VDDS is used to power the pins, optionally with a transceiver to @@ -304,6 +313,25 @@ static int omap_hsmmc_set_power(struct device *dev, int slot, int power_on, if (mmc_slot(host).after_set_reg) mmc_slot(host).after_set_reg(dev, slot, power_on, vdd); + /* 100ms delay required for PBIAS configuration */ + msleep(100);Hmm, why is the delay needed before the configuration? Is this something you could avoid by reading the pinconf state maybe?
This delay is needed for regulator voltage to stabilize.
+ if (!vdd && host->pinctrl && host->pbias_off) { + ret = pinctrl_select_state(host->pinctrl, host->pbias_off); + if (ret < 0) + dev_err(host->dev, "pinctrl pbias_off select error\n"); + } else if (((1 << vdd) <= MMC_VDD_165_195) && host->pinctrl && + host->pbias_1v8) { + ret = pinctrl_select_state(host->pinctrl, host->pbias_1v8); + if (ret < 0) + dev_err(host->dev, "pinctrl pbias_1v8 select error\n"); + } else if (((1 << vdd) > MMC_VDD_165_195) && host->pinctrl && + host->pbias_3v) { + ret = pinctrl_select_state(host->pinctrl, host->pbias_3v); + if (ret < 0) + dev_err(host->dev, "pinctrl pbias_3v select error\n"); + } + usleep_range(350, 400); + return ret; }Maybe add some macro for doing the if (((1 << vdd) <= MMC_VDD_165_195)... tests?
OK
@@ -1775,6 +1803,52 @@ static inline struct omap_mmc_platform_data } #endif +static int omap_hsmmc_pinctrl_init(struct omap_hsmmc_host *host) +{ + int ret = 0; + + host->pinctrl = devm_pinctrl_get(host->dev); + if (IS_ERR(host->pinctrl)) { + host->pinctrl = NULL; + dev_warn(host->dev, + "pins are not configured from the driver\n"); + return 0; + } + + host->mmc_init = pinctrl_lookup_state(host->pinctrl, "mmc_init"); + if (IS_ERR(host->mmc_init)) { + dev_vdbg(host->dev, "optional: mmc_init lookup error"); + host->mmc_init = NULL; + } else { + ret = pinctrl_select_state(host->pinctrl, host->mmc_init); + if (ret < 0) { + dev_err(host->dev, "pinctrl mmc_init select error\n"); + goto err_pinctrl; + } + } + + host->pbias_off = pinctrl_lookup_state(host->pinctrl, "pbias_off"); + if (IS_ERR(host->pbias_off)) { + dev_vdbg(host->dev, "optional: pbias_off lookup error"); + host->pbias_off = NULL; + } + + host->pbias_1v8 = pinctrl_lookup_state(host->pinctrl, "pbias_1v8"); + if (IS_ERR(host->pbias_1v8)) { + dev_vdbg(host->dev, "optional: pbias_1v8 lookup error"); + host->pbias_1v8 = NULL; + } + + host->pbias_3v = pinctrl_lookup_state(host->pinctrl, "pbias_3v"); + if (IS_ERR(host->pbias_3v)) { + dev_vdbg(host->dev, "optional: pbias_3v lookup error"); + host->pbias_3v = NULL; + } + +err_pinctrl: + return ret; +}Linus W may have some comments on this, although this is not the standard muxing stuff. The "mmc_init" state pins should be added to just the regular default state? Note that you can have phandles to however many sets of pins there.
Yes, can add &mmc_init pin config to default state.
static int omap_hsmmc_probe(struct platform_device *pdev) { struct omap_mmc_platform_data *pdata = pdev->dev.platform_data; @@ -1785,7 +1859,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev) const struct of_device_id *match; dma_cap_mask_t mask; unsigned tx_req, rx_req; - struct pinctrl *pinctrl; match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev); if (match) { @@ -2005,10 +2078,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev) omap_hsmmc_disable_irq(host); - pinctrl = devm_pinctrl_get_select_default(&pdev->dev); - if (IS_ERR(pinctrl)) - dev_warn(&pdev->dev, - "pins are not configured from the driver\n"); + ret = omap_hsmmc_pinctrl_init(host); + if (ret) + goto err_pinctrl_state; omap_hsmmc_protect_card(host); @@ -2034,6 +2106,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev) err_slot_name: mmc_remove_host(mmc); +err_pinctrl_state: free_irq(mmc_slot(host).card_detect_irq, host); err_irq_cd: omap_hsmmc_reg_put(host);Regards, Tony
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