[PATCH 5/8] sdhci: sdhci-esdhc-imx: change pinctrl state according to uhs mode
Dong Aisheng
dongas86 at gmail.com
Fri Sep 13 12:38:34 EDT 2013
Hi Ulf,
Thanks for the reply.
On Fri, Sep 13, 2013 at 10:01 PM, Ulf Hansson <ulf.hansson at linaro.org> wrote:
> On 5 September 2013 18:04, Dong Aisheng <dongas86 at gmail.com> wrote:
>> Hi Ulf,
>>
>> On Thu, Sep 5, 2013 at 3:38 PM, Ulf Hansson <ulf.hansson at linaro.org> wrote:
>>> On 4 September 2013 14:54, Dong Aisheng <b29396 at freescale.com> 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;
>>>> + }
>>>> +
>>>> + if (pinctrl == imx_data->pins_current)
>>>> + return 0;
>>>> +
>>>> + 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;
>>>> +
>>>> 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);
>>>
>>> I believe you should look into the new pinctrl APIs and the new
>>> sequence at device driver core probe, which automatically fetches
>>> default, idle and sleep state pins. Additionally it sets the default
>>> state.
>>>
>>> It should likely simplifies some code in this patch.
>>>
>>
>> After looking into the pinctrl automatically fetch states, it seems
>> above two line may could be replaced as:
>> imx_data->pinctrl = (&pdev->dev)->pins->p;
>> imx_data->pins_default = (&pdev->dev)->pins->default_state;
>
> pinctrl_pm_select_default_state(dev)
> pinctrl_pm_select_ilde_state(dev)
> pinctrl_pm_select_sleep_state(dev)
>
> The states are fetched from device core at probe.
>
I did not use idle and sleep state, instead, i need get another two private
defined states, state_100mhz, state_200mhz and select between them,
so these API seems not so useful for my case.
Even i want to use this API, i can only use it for default state which seems
not so neccesary.
Regards
Dong Aisheng
> Kind regards
> Ulf Hansson
>
>
>>
>> However, i'm not sure touching the pinctrl internal implementations in
>> device core is a good choice.
>> So i may still like to keep the exist using.
>>
>> Regards
>> Dong Aisheng
>>
>>> Kind regards
>>> Ulf Hansson
>>>
>>>
>>>> + 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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>>>
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