From: Victor Shih <victorshihgli@gmail.com>
To: ulf.hansson@linaro.org, adrian.hunter@intel.com
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
benchuanggli@gmail.com, HL.Liu@genesyslogic.com.tw,
Greg.tu@genesyslogic.com.tw, takahiro.akashi@linaro.org,
dlunev@chromium.org,
Victor Shih <victor.shih@genesyslogic.com.tw>,
Ben Chuang <ben.chuang@genesyslogic.com.tw>
Subject: [PATCH V5 14/26] mmc: sdhci-uhs2: add set_timeout()
Date: Fri, 14 Oct 2022 19:45:49 +0800 [thread overview]
Message-ID: <20221014114601.15594-15-victor.shih@genesyslogic.com.tw> (raw)
In-Reply-To: <20221014114601.15594-1-victor.shih@genesyslogic.com.tw>
From: AKASHI Takahiro <takahiro.akashi@linaro.org>
This is a UHS-II version of sdhci's set_timeout() operation.
Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
drivers/mmc/host/sdhci-uhs2.c | 85 +++++++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci-uhs2.h | 1 +
2 files changed, 86 insertions(+)
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 4dc3e904d7d2..2b90e5308764 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -196,6 +196,91 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
}
EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
+static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res,
+ u8 *dead_lock)
+{
+ u8 count;
+ unsigned int cmd_res_timeout, dead_lock_timeout, current_timeout;
+
+ /*
+ * If the host controller provides us with an incorrect timeout
+ * value, just skip the check and use 0xE. The hardware may take
+ * longer to time out, but that's much better than having a too-short
+ * timeout value.
+ */
+ if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) {
+ *cmd_res = 0xE;
+ *dead_lock = 0xE;
+ return 0xE;
+ }
+
+ /* timeout in us */
+ cmd_res_timeout = 5 * 1000;
+ dead_lock_timeout = 1 * 1000 * 1000;
+
+ /*
+ * Figure out needed cycles.
+ * We do this in steps in order to fit inside a 32 bit int.
+ * The first step is the minimum timeout, which will have a
+ * minimum resolution of 6 bits:
+ * (1) 2^13*1000 > 2^22,
+ * (2) host->timeout_clk < 2^16
+ * =>
+ * (1) / (2) > 2^6
+ */
+ count = 0;
+ current_timeout = (1 << 13) * 1000 / host->timeout_clk;
+ while (current_timeout < cmd_res_timeout) {
+ count++;
+ current_timeout <<= 1;
+ if (count >= 0xF)
+ break;
+ }
+
+ if (count >= 0xF) {
+ DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n",
+ mmc_hostname(host->mmc), count);
+ count = 0xE;
+ }
+ *cmd_res = count;
+
+ count = 0;
+ current_timeout = (1 << 13) * 1000 / host->timeout_clk;
+ while (current_timeout < dead_lock_timeout) {
+ count++;
+ current_timeout <<= 1;
+ if (count >= 0xF)
+ break;
+ }
+
+ if (count >= 0xF) {
+ DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n",
+ mmc_hostname(host->mmc), count);
+ count = 0xE;
+ }
+ *dead_lock = count;
+
+ return count;
+}
+
+static void __sdhci_uhs2_set_timeout(struct sdhci_host *host)
+{
+ u8 cmd_res, dead_lock;
+
+ sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
+ cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;
+ sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
+}
+
+void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
+{
+ __sdhci_set_timeout(host, cmd);
+
+ if (host->mmc->flags & MMC_UHS2_SUPPORT)
+ __sdhci_uhs2_set_timeout(host);
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
+
/*****************************************************************************\
* *
* MMC callbacks *
diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index 3179915f7f79..5ea235b14108 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -215,5 +215,6 @@ bool sdhci_uhs2_mode(struct sdhci_host *host);
void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
unsigned short vdd);
+void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
#endif /* __SDHCI_UHS2_H */
--
2.25.1
next prev parent reply other threads:[~2022-10-14 11:48 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-14 11:45 [PATCH V5 00/26] Add support UHS-II for GL9755 Victor Shih
2022-10-14 11:45 ` [PATCH V5 01/26] mmc: core: Cleanup printing of speed mode at card insertion Victor Shih
2022-10-14 11:45 ` [PATCH V5 02/26] mmc: core: Prepare to support SD UHS-II cards Victor Shih
2022-10-14 11:45 ` [PATCH V5 03/26] mmc: core: Announce successful insertion of an SD UHS-II card Victor Shih
2022-10-14 11:45 ` [PATCH V5 04/26] mmc: core: Extend support for mmc regulators with a vqmmc2 Victor Shih
2022-10-14 11:45 ` [PATCH V5 05/26] mmc: core: Add definitions for SD UHS-II cards Victor Shih
2022-10-14 11:45 ` [PATCH V5 06/26] mmc: core: Support UHS-II card control and access Victor Shih
2022-10-14 11:45 ` [PATCH V5 07/26] mmc: sdhci: add a kernel configuration for enabling UHS-II support Victor Shih
2022-10-14 11:45 ` [PATCH V5 08/26] mmc: sdhci: add UHS-II related definitions in headers Victor Shih
2022-10-14 11:45 ` [PATCH V5 09/26] mmc: sdhci: add UHS-II module Victor Shih
2022-10-14 11:45 ` [PATCH V5 10/26] mmc: sdhci-uhs2: dump UHS-II registers Victor Shih
2022-10-14 11:45 ` [PATCH V5 11/26] mmc: sdhci-uhs2: add reset function and uhs2_mode function Victor Shih
2022-10-14 11:45 ` [PATCH V5 12/26] mmc: sdhci-uhs2: add set_power() to support vdd2 Victor Shih
2022-10-14 11:45 ` [PATCH V5 13/26] mmc: sdhci-uhs2: skip signal_voltage_switch() Victor Shih
2022-10-14 11:45 ` Victor Shih [this message]
2022-10-14 11:45 ` [PATCH V5 15/26] mmc: sdhci-uhs2: add set_ios() Victor Shih
2022-10-14 11:45 ` [PATCH V5 16/26] mmc: sdhci-uhs2: add detect_init() to detect the interface Victor Shih
2022-10-14 11:45 ` [PATCH V5 17/26] mmc: sdhci-uhs2: add clock operations Victor Shih
2022-10-14 11:45 ` [PATCH V5 18/26] mmc: sdhci-uhs2: add uhs2_control() to initialise the interface Victor Shih
2022-10-14 11:45 ` [PATCH V5 19/26] mmc: sdhci-uhs2: add request() and others Victor Shih
2022-10-14 11:45 ` [PATCH V5 20/26] mmc: sdhci-uhs2: add irq() " Victor Shih
2022-10-14 11:45 ` [PATCH V5 21/26] mmc: sdhci-uhs2: add add_host() and others to set up the driver Victor Shih
2022-10-14 11:45 ` [PATCH V5 22/26] mmc: sdhci-uhs2: add pre-detect_init hook Victor Shih
2022-10-14 11:45 ` [PATCH V5 23/26] mmc: core: add post-mmc_attach_sd hook Victor Shih
2022-10-14 11:45 ` [PATCH V5 24/26] mmc: sdhci-uhs2: " Victor Shih
2022-10-14 11:46 ` [PATCH V5 25/26] mmc: sdhci-pci: add UHS-II support framework Victor Shih
2022-10-14 11:46 ` [PATCH V5 26/26] mmc: sdhci-pci-gli: enable UHS-II mode for GL9755 Victor Shih
2022-10-17 11:31 ` [PATCH V5 00/26] Add support UHS-II " Ulf Hansson
2022-10-19 11:02 ` Victor Shih
2022-10-17 9:11 Victor Shih
2022-10-17 9:11 ` [PATCH V5 14/26] mmc: sdhci-uhs2: add set_timeout() Victor Shih
2022-10-19 11:06 [PATCH V5 00/26] Add support UHS-II for GL9755 Victor Shih
2022-10-19 11:06 ` [PATCH V5 14/26] mmc: sdhci-uhs2: add set_timeout() Victor Shih
2022-11-01 17:14 ` Adrian Hunter
2022-12-13 8:46 ` Victor Shih
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