[PATCH 5/8] sdhci: sdhci-esdhc-imx: change pinctrl state according to uhs mode
Dong Aisheng
dongas86 at gmail.com
Thu Sep 5 11:06:45 EDT 2013
On Thu, Sep 5, 2013 at 2:34 PM, Shawn Guo <shawn.guo at linaro.org> wrote:
> On Wed, Sep 04, 2013 at 08:54:14PM +0800, Dong Aisheng wrote:
>> Without proper pinctrl state, the card may not be able to work
>> on high speed stablely. e.g. SDR104.
>>
>> This patch add pinctrl state switch code according to different
>> uhs mode include 100mhz sate, 200mhz sate and normal state
>> (50Mhz and below).
>>
>> Signed-off-by: Dong Aisheng <b29396 at freescale.com>
>> ---
>> drivers/mmc/host/sdhci-esdhc-imx.c | 110 ++++++++++++++++++++++++++-
>> include/linux/platform_data/mmc-esdhc-imx.h | 4 +
>> 2 files changed, 113 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
>> index 36b9f63..3e89863 100644
>> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
>> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
>> @@ -49,6 +49,10 @@
>>
>> #define ESDHC_TUNING_BLOCK_PATTERN_LEN 64
>>
>> +/* pinctrl state */
>> +#define ESDHC_PINCTRL_STATE_100MHZ "state_100mhz"
>> +#define ESDHC_PINCTRL_STATE_200MHZ "state_200mhz"
>> +
>> /*
>> * Our interpretation of the SDHCI_HOST_CONTROL register
>> */
>> @@ -90,6 +94,10 @@ struct pltfm_imx_data {
>> u32 scratchpad;
>> enum imx_esdhc_type devtype;
>> struct pinctrl *pinctrl;
>> + struct pinctrl_state *pins_current;
>> + struct pinctrl_state *pins_default;
>> + struct pinctrl_state *pins_100mhz;
>> + struct pinctrl_state *pins_200mhz;
>> struct esdhc_platform_data boarddata;
>> struct clk *clk_ipg;
>> struct clk *clk_ahb;
>> @@ -642,6 +650,75 @@ static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
>> return ret;
>> }
>>
>> +static int esdhc_change_pinstate(struct sdhci_host *host,
>> + unsigned int uhs)
>> +{
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct pltfm_imx_data *imx_data = pltfm_host->priv;
>> + struct pinctrl_state *pinctrl;
>> + int ret;
>> +
>> + dev_dbg(mmc_dev(host->mmc), "change pinctrl state for uhs %d\n", uhs);
>> +
>> + if (IS_ERR(imx_data->pinctrl) ||
>> + IS_ERR(imx_data->pins_default) ||
>> + IS_ERR(imx_data->pins_100mhz) ||
>> + IS_ERR(imx_data->pins_200mhz))
>> + return -EINVAL;
>> +
>> + switch (uhs) {
>> + case MMC_TIMING_UHS_SDR12:
>> + case MMC_TIMING_UHS_SDR25:
>> + case MMC_TIMING_UHS_DDR50:
>> + pinctrl = imx_data->pins_default;
>> + break;
>> + case MMC_TIMING_UHS_SDR50:
>> + pinctrl = imx_data->pins_100mhz;
>> + break;
>> + case MMC_TIMING_UHS_SDR104:
>> + pinctrl = imx_data->pins_200mhz;
>> + break;
>> + default:
>> + /* back to default state for other legacy timing */
>> + pinctrl = imx_data->pins_default;
>> + }
>
> So it can be equally written as below?
>
> switch (uhs) {
> case MMC_TIMING_UHS_SDR104:
> pinctrl = imx_data->pins_200mhz;
> break;
> case MMC_TIMING_UHS_SDR50:
> pinctrl = imx_data->pins_100mhz;
> break;
> default:
> pinctrl = imx_data->pins_default;
> }
>
Seems good.
>> +
>> + if (pinctrl == imx_data->pins_current)
>> + return 0;
>
> I think pinctrl_select_state() already take care of the check?
>
Looks right.
I will remove it.
>> +
>> + ret = pinctrl_select_state(imx_data->pinctrl, pinctrl);
>> + if (!ret)
>> + imx_data->pins_current = pinctrl;
>> +
>> + return ret;
>> +}
>> +
>> +static int esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
>> +{
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct pltfm_imx_data *imx_data = pltfm_host->priv;
>> +
>> + switch (uhs) {
>> + case MMC_TIMING_UHS_SDR12:
>> + imx_data->uhs_mode = SDHCI_CTRL_UHS_SDR12;
>> + break;
>> + case MMC_TIMING_UHS_SDR25:
>> + imx_data->uhs_mode = SDHCI_CTRL_UHS_SDR25;
>> + break;
>> + case MMC_TIMING_UHS_SDR50:
>> + imx_data->uhs_mode = SDHCI_CTRL_UHS_SDR50;
>> + break;
>> + case MMC_TIMING_UHS_SDR104:
>> + imx_data->uhs_mode = SDHCI_CTRL_UHS_SDR104;
>> + break;
>> + case MMC_TIMING_UHS_DDR50:
>> + imx_data->uhs_mode = SDHCI_CTRL_UHS_DDR50;
>> + break;
>> + }
>> +
>> + return esdhc_change_pinstate(host, uhs);
>> +}
>> +
>> static const struct sdhci_ops sdhci_esdhc_ops = {
>> .read_l = esdhc_readl_le,
>> .read_w = esdhc_readw_le,
>> @@ -653,6 +730,7 @@ static const struct sdhci_ops sdhci_esdhc_ops = {
>> .get_min_clock = esdhc_pltfm_get_min_clock,
>> .get_ro = esdhc_pltfm_get_ro,
>> .platform_bus_width = esdhc_pltfm_bus_width,
>> + .set_uhs_signaling = esdhc_set_uhs_signaling,
>> .platform_execute_tuning = esdhc_executing_tuning,
>> };
>>
>> @@ -695,6 +773,11 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
>>
>> of_property_read_u32(np, "max-frequency", &boarddata->f_max);
>>
>> + if (of_find_property(np, "no-1-8-v", NULL))
>> + boarddata->support_vsel = false;
>> + else
>> + boarddata->support_vsel = true;
>
> So you check "no-1-8-v" property, set support_vsel here and then set
> SDHCI_QUIRK2_NO_1_8_V accordingly below in sdhci_esdhc_imx_probe().
> But sdhci_get_of_property() - sdhci-pltfm.c already does the job.
>
We're not using sdhci_get_of_property.
I will consider to use it, that can be another patch later.
Regards
Dong Aisheng
> Shawn
>
>> +
>> return 0;
>> }
>> #else
>> @@ -757,12 +840,20 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
>> clk_prepare_enable(imx_data->clk_ipg);
>> clk_prepare_enable(imx_data->clk_ahb);
>>
>> - imx_data->pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
>> + imx_data->pinctrl = devm_pinctrl_get(&pdev->dev);
>> if (IS_ERR(imx_data->pinctrl)) {
>> err = PTR_ERR(imx_data->pinctrl);
>> goto disable_clk;
>> }
>>
>> + imx_data->pins_default = pinctrl_lookup_state(imx_data->pinctrl,
>> + PINCTRL_STATE_DEFAULT);
>> + if (IS_ERR(imx_data->pins_default)) {
>> + err = PTR_ERR(imx_data->pins_default);
>> + dev_err(mmc_dev(host->mmc), "could not get default state\n");
>> + goto disable_clk;
>> + }
>> +
>> host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
>>
>> if (is_imx25_esdhc(imx_data) || is_imx35_esdhc(imx_data))
>> @@ -839,6 +930,23 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
>> break;
>> }
>>
>> + /* sdr50 and sdr104 needs work on 1.8v signal voltage */
>> + if ((boarddata->support_vsel) && is_imx6q_usdhc(imx_data)) {
>> + imx_data->pins_100mhz = pinctrl_lookup_state(imx_data->pinctrl,
>> + ESDHC_PINCTRL_STATE_100MHZ);
>> + imx_data->pins_200mhz = pinctrl_lookup_state(imx_data->pinctrl,
>> + ESDHC_PINCTRL_STATE_200MHZ);
>> + if (IS_ERR(imx_data->pins_100mhz) ||
>> + IS_ERR(imx_data->pins_200mhz)) {
>> + dev_warn(mmc_dev(host->mmc),
>> + "could not get ultra high speed state, work on normal mode\n");
>> + /* fall back to not support uhs by specify no 1.8v quirk */
>> + host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
>> + }
>> + } else {
>> + host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
>> + }
>> +
>> err = sdhci_add_host(host);
>> if (err)
>> goto disable_clk;
>> diff --git a/include/linux/platform_data/mmc-esdhc-imx.h b/include/linux/platform_data/mmc-esdhc-imx.h
>> index d44912d..a0f5a8f 100644
>> --- a/include/linux/platform_data/mmc-esdhc-imx.h
>> +++ b/include/linux/platform_data/mmc-esdhc-imx.h
>> @@ -10,6 +10,8 @@
>> #ifndef __ASM_ARCH_IMX_ESDHC_H
>> #define __ASM_ARCH_IMX_ESDHC_H
>>
>> +#include <linux/types.h>
>> +
>> enum wp_types {
>> ESDHC_WP_NONE, /* no WP, neither controller nor gpio */
>> ESDHC_WP_CONTROLLER, /* mmc controller internal WP */
>> @@ -32,6 +34,7 @@ enum cd_types {
>> * @cd_gpio: gpio for card_detect interrupt
>> * @wp_type: type of write_protect method (see wp_types enum above)
>> * @cd_type: type of card_detect method (see cd_types enum above)
>> + * @support_vsel: indicate it supports 1.8v switching
>> */
>>
>> struct esdhc_platform_data {
>> @@ -41,5 +44,6 @@ struct esdhc_platform_data {
>> enum cd_types cd_type;
>> int max_bus_width;
>> unsigned int f_max;
>> + bool support_vsel;
>> };
>> #endif /* __ASM_ARCH_IMX_ESDHC_H */
>> --
>> 1.7.1
>>
>>
>
>
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