mmc: sdhci-uhs2: add set_timeout()

This is a UHS-II version of sdhci's set_timeout() operation.
Use sdhci_uhs2_set_timeout() to set and calculate the timeout time.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Message-ID: <20241018105333.4569-8-victorshihgli@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 756e44d84b87aa375ec9fd47113699345be0a8e6..6b249eb8395a8edf8945377009dc1350d0fd6ca4 100644 (file)
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -13,6 +13,7 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/iopoll.h>
+#include <linux/bitfield.h>
 
 #include "sdhci.h"
 #include "sdhci-uhs2.h"
@@ -135,6 +136,77 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, unsigned
 }
 EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
 
+static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res, u8 *dead_lock)
+{
+       /* timeout in us */
+       unsigned int dead_lock_timeout = 1 * 1000 * 1000;
+       unsigned int cmd_res_timeout = 5 * 1000;
+       unsigned int current_timeout;
+       u8 count;
+
+       /*
+        * 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 |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock);
+       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 (mmc_card_uhs2(host->mmc))
+               __sdhci_uhs2_set_timeout(host);
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
+
 /*****************************************************************************\
  *                                                                           *
  * Driver init/exit                                                          *

diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index 31db04f80bb99ba1ed7468cd7329b4b0e25cf8f5..d91474e656f82b3afcee867d25bce3658dc246f3 100644 (file)
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -173,9 +173,11 @@
 #define SDHCI_UHS2_VENDOR_PTR                  0xE8
 
 struct sdhci_host;
+struct mmc_command;
 
 void sdhci_uhs2_dump_regs(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 */