From: Ulf Hansson <ulf.hansson@linaro.org>
To: Sowjanya Komatineni <skomatineni@nvidia.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>,
Bradley Bolen <bradleybolen@gmail.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jon Hunter <jonathanh@nvidia.com>,
Aniruddha Tvs Rao <anrao@nvidia.com>,
linux-tegra <linux-tegra@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>
Subject: Re: [PATCH v2 1/2] sdhci: tegra: Implement Tegra specific set_timeout callback
Date: Thu, 12 Mar 2020 14:08:11 +0100 [thread overview]
Message-ID: <CAPDyKFpAgk0uboGXdmA_m1-2=GK2oRXVv+97ZFFFAtT-ZZo4fw@mail.gmail.com> (raw)
In-Reply-To: <1583886030-11339-1-git-send-email-skomatineni@nvidia.com>
-trimmed cc list
On Thu, 12 Mar 2020 at 00:51, Sowjanya Komatineni
<skomatineni@nvidia.com> wrote:
>
> Tegra host supports HW busy detection and timeouts based on the
> count programmed in SDHCI_TIMEOUT_CONTROL register and max busy
> timeout it supports is 11s in finite busy wait mode.
>
> Some operations like SLEEP_AWAKE, ERASE and flush cache through
> SWITCH commands take longer than 11s and Tegra host supports
> infinite HW busy wait mode where HW waits forever till the card
> is busy without HW timeout.
>
> This patch implements Tegra specific set_timeout sdhci_ops to allow
> switching between finite and infinite HW busy detection wait modes
> based on the device command expected operation time.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Applied for next, thanks!
We should probably tag this for stable as well, don't you think?
Kind regards
Uffe
> ---
> drivers/mmc/host/sdhci-tegra.c | 31 +++++++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index a25c3a4..fa8f6a4 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -45,6 +45,7 @@
> #define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT 8
>
> #define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120
> +#define SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT BIT(0)
> #define SDHCI_MISC_CTRL_ENABLE_SDR104 0x8
> #define SDHCI_MISC_CTRL_ENABLE_SDR50 0x10
> #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20
> @@ -1227,6 +1228,34 @@ static u32 sdhci_tegra_cqhci_irq(struct sdhci_host *host, u32 intmask)
> return 0;
> }
>
> +static void tegra_sdhci_set_timeout(struct sdhci_host *host,
> + struct mmc_command *cmd)
> +{
> + u32 val;
> +
> + /*
> + * HW busy detection timeout is based on programmed data timeout
> + * counter and maximum supported timeout is 11s which may not be
> + * enough for long operations like cache flush, sleep awake, erase.
> + *
> + * ERASE_TIMEOUT_LIMIT bit of VENDOR_MISC_CTRL register allows
> + * host controller to wait for busy state until the card is busy
> + * without HW timeout.
> + *
> + * So, use infinite busy wait mode for operations that may take
> + * more than maximum HW busy timeout of 11s otherwise use finite
> + * busy wait mode.
> + */
> + val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
> + if (cmd && cmd->busy_timeout >= 11 * HZ)
> + val |= SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
> + else
> + val &= ~SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
> + sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_MISC_CTRL);
> +
> + __sdhci_set_timeout(host, cmd);
> +}
> +
> static const struct cqhci_host_ops sdhci_tegra_cqhci_ops = {
> .write_l = tegra_cqhci_writel,
> .enable = sdhci_tegra_cqe_enable,
> @@ -1366,6 +1395,7 @@ static const struct sdhci_ops tegra210_sdhci_ops = {
> .set_uhs_signaling = tegra_sdhci_set_uhs_signaling,
> .voltage_switch = tegra_sdhci_voltage_switch,
> .get_max_clock = tegra_sdhci_get_max_clock,
> + .set_timeout = tegra_sdhci_set_timeout,
> };
>
> static const struct sdhci_pltfm_data sdhci_tegra210_pdata = {
> @@ -1403,6 +1433,7 @@ static const struct sdhci_ops tegra186_sdhci_ops = {
> .voltage_switch = tegra_sdhci_voltage_switch,
> .get_max_clock = tegra_sdhci_get_max_clock,
> .irq = sdhci_tegra_cqhci_irq,
> + .set_timeout = tegra_sdhci_set_timeout,
> };
>
> static const struct sdhci_pltfm_data sdhci_tegra186_pdata = {
> --
> 2.7.4
>
next prev parent reply other threads:[~2020-03-12 13:08 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 0:20 [PATCH v2 1/2] sdhci: tegra: Implement Tegra specific set_timeout callback Sowjanya Komatineni
2020-03-11 0:20 ` [PATCH v2 2/2] sdhci: tegra: Enable MMC_CAP_WAIT_WHILE_BUSY host capability Sowjanya Komatineni
2020-03-12 13:08 ` Ulf Hansson [this message]
2020-03-12 15:28 ` [PATCH v2 1/2] sdhci: tegra: Implement Tegra specific set_timeout callback Sowjanya Komatineni
2020-03-12 15:35 ` Ulf Hansson
2020-03-13 1:19 ` Sowjanya Komatineni
2020-04-15 17:55 ` Naresh Kamboju
2020-04-16 10:59 ` Ulf Hansson
2020-04-16 11:37 ` Greg Kroah-Hartman
2020-04-16 16:29 ` Sowjanya Komatineni
2020-04-16 19:38 ` Sowjanya Komatineni
2020-04-17 8:04 ` Ulf Hansson
2020-04-17 18:29 ` Sowjanya Komatineni
2020-03-11 8:54 Sowjanya Komatineni
2020-03-11 8:56 Sowjanya Komatineni
2020-03-11 15:47 Sowjanya Komatineni
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