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Message-ID: <201a16a1-b3bb-8aa9-af42-9683986be417@intel.com>
Date: Wed, 12 Apr 2023 16:12:17 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Victor Shih <victorshihgli@...il.com>, ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
Greg.tu@...esyslogic.com.tw, takahiro.akashi@...aro.org,
dlunev@...omium.org, Victor Shih <victor.shih@...esyslogic.com.tw>,
Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH V7 20/23] mmc: sdhci-uhs2: add add_host() and others to
set up the driver
On 31/03/23 13:55, Victor Shih wrote:
> This is a UHS-II version of sdhci's add_host/remove_host operation.
> Any sdhci drivers which are capable of handling UHS-II cards must
> call those functions instead of the corresponding sdhci's.
>
> Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> ---
> drivers/mmc/host/sdhci-uhs2.c | 119 ++++++++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci-uhs2.h | 2 +
> drivers/mmc/host/sdhci.c | 7 +-
> drivers/mmc/host/sdhci.h | 3 +
> 4 files changed, 129 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index 63f4bfce70b8..610780d425bc 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -17,6 +17,7 @@
> #include <linux/ktime.h>
> #include <linux/mmc/mmc.h>
> #include <linux/mmc/host.h>
> +#include <linux/regulator/consumer.h>
>
> #include "sdhci.h"
> #include "sdhci-uhs2.h"
> @@ -1004,6 +1005,124 @@ static irqreturn_t sdhci_uhs2_thread_irq(int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> +/*****************************************************************************\
> + *
> + * Device allocation/registration *
> + * *
> +\*****************************************************************************/
> +
> +static int __sdhci_uhs2_add_host_v4(struct sdhci_host *host, u32 caps1)
Always returns 0, so change return type to 'void'
> +{
> + struct mmc_host *mmc;
> + u32 max_current_caps2;
> +
> + if (host->version < SDHCI_SPEC_400)
> + return 0;
> +
> + mmc = host->mmc;
> +
> + /* Support UHS2 */
> + if (caps1 & SDHCI_SUPPORT_UHS2)
> + mmc->caps2 |= MMC_CAP2_SD_UHS2;
> +
> + max_current_caps2 = sdhci_readl(host, SDHCI_MAX_CURRENT_1);
> +
> + if ((caps1 & SDHCI_CAN_VDD2_180) &&
> + !max_current_caps2 &&
> + !IS_ERR(mmc->supply.vmmc2)) {
> + /* UHS2 - VDD2 */
> + int curr = regulator_get_current_limit(mmc->supply.vmmc2);
> +
> + if (curr > 0) {
> + /* convert to SDHCI_MAX_CURRENT format */
> + curr = curr / 1000; /* convert to mA */
> + curr = curr / SDHCI_MAX_CURRENT_MULTIPLIER;
> + curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
> + max_current_caps2 = curr;
> + }
> + }
> +
> + if (caps1 & SDHCI_CAN_VDD2_180) {
> + mmc->ocr_avail_uhs2 |= MMC_VDD_165_195;
> + /*
> + * UHS2 doesn't require this. Only UHS-I bus needs to set
> + * max current.
> + */
> + mmc->max_current_180_vdd2 = (max_current_caps2 &
> + SDHCI_MAX_CURRENT_VDD2_180_MASK) *
> + SDHCI_MAX_CURRENT_MULTIPLIER;
max_current_180_vdd2 is not used. Does it have a purpose?
> + } else {
> + mmc->caps2 &= ~MMC_CAP2_SD_UHS2;
> + }
> +
> + return 0;
> +}
> +
> +static int sdhci_uhs2_host_ops_init(struct sdhci_host *host);
> +
> +static void __sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
> +{
> + if (!sdhci_uhs2_mode(host))
> + return;
> +
> + if (!dead)
> + sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_FULL);
> +}
> +
> +int sdhci_uhs2_add_host(struct sdhci_host *host)
> +{
> + struct mmc_host *mmc = host->mmc;
> + int ret;
> +
> + ret = sdhci_setup_host(host);
> + if (ret)
> + return ret;
> +
> + if (host->version >= SDHCI_SPEC_400) {
> + ret = __sdhci_uhs2_add_host_v4(host, host->caps1);
> + if (ret)
> + goto cleanup;
> + }
> +
> + if ((mmc->caps2 & MMC_CAP2_SD_UHS2) && !host->v4_mode)
> + /* host doesn't want to enable UHS2 support */
> + /* FIXME: Do we have to do some cleanup here? */
Please do not leave FIXMEs
> + mmc->caps2 &= ~MMC_CAP2_SD_UHS2;
> +
> + /* overwrite ops */
> + if (mmc->caps2 & MMC_CAP2_SD_UHS2)
> + sdhci_uhs2_host_ops_init(host);
> +
> + host->complete_work_fn = sdhci_uhs2_complete_work;
> + host->thread_irq_fn = sdhci_uhs2_thread_irq;
> +
> + /* LED support not implemented for UHS2 */
> + host->quirks |= SDHCI_QUIRK_NO_LED;
> +
> + ret = __sdhci_add_host(host);
> + if (ret)
> + goto cleanup2;
> +
> + return 0;
> +
> +cleanup2:
> + if (host->version >= SDHCI_SPEC_400)
> + __sdhci_uhs2_remove_host(host, 0);
> +cleanup:
> + sdhci_cleanup_host(host);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(sdhci_uhs2_add_host);
> +
> +void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
> +{
> + __sdhci_uhs2_remove_host(host, dead);
> +
> + sdhci_remove_host(host, dead);
> +}
> +EXPORT_SYMBOL_GPL(sdhci_uhs2_remove_host);
> +
> void sdhci_uhs2_request(struct mmc_host *mmc, struct mmc_request *mrq)
> {
> struct sdhci_host *host = mmc_priv(mmc);
> diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> index f733c733c692..5b5b4a8d4f27 100644
> --- a/drivers/mmc/host/sdhci-uhs2.h
> +++ b/drivers/mmc/host/sdhci-uhs2.h
> @@ -185,5 +185,7 @@ void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set);
> void sdhci_uhs2_request(struct mmc_host *mmc, struct mmc_request *mrq);
> int sdhci_uhs2_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq);
> u32 sdhci_uhs2_irq(struct sdhci_host *host, u32 intmask);
> +int sdhci_uhs2_add_host(struct sdhci_host *host);
> +void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead);
>
> #endif /* __SDHCI_UHS2_H */
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index b3cf4a26eed5..d976d3a6ff8d 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -4105,6 +4105,9 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev,
>
> host->max_timeout_count = 0xE;
>
> + host->complete_work_fn = sdhci_complete_work;
> + host->thread_irq_fn = sdhci_thread_irq;
> +
> return host;
> }
>
> @@ -4854,7 +4857,7 @@ int __sdhci_add_host(struct sdhci_host *host)
> if (!host->complete_wq)
> return -ENOMEM;
>
> - INIT_WORK(&host->complete_work, sdhci_complete_work);
> + INIT_WORK(&host->complete_work, host->complete_work_fn);
>
> timer_setup(&host->timer, sdhci_timeout_timer, 0);
> timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
> @@ -4863,7 +4866,7 @@ int __sdhci_add_host(struct sdhci_host *host)
>
> sdhci_init(host, 0);
>
> - ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
> + ret = request_threaded_irq(host->irq, sdhci_irq, host->thread_irq_fn,
> IRQF_SHARED, mmc_hostname(mmc), host);
> if (ret) {
> pr_err("%s: Failed to request IRQ %d: %d\n",
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 9e9158f811b1..e16267f5a3c0 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -627,6 +627,9 @@ struct sdhci_host {
> struct timer_list timer; /* Timer for timeouts */
> struct timer_list data_timer; /* Timer for data timeouts */
>
> + void (*complete_work_fn)(struct work_struct *work);
> + irqreturn_t (*thread_irq_fn)(int irq, void *dev_id);
> +
> #if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA)
> struct dma_chan *rx_chan;
> struct dma_chan *tx_chan;
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