mmc: core: Fix the HPI execution sequence

mmc_execute_hpi should send the HPI command only once, and only
if the card is in PRG state.

According to eMMC spec, the command's completion time is
not dependent on OUT_OF_INTERRUPT_TIME. Only the transition
out of PRG STATE is guarded by OUT_OF_INTERRUPT_TIME - which
is defined to begin at the end of sending the command itself.

Specify the default timeout for the actual sending of HPI
command, and then use OUT_OF_INTERRUPT_TIME to wait for
the transition out of PRG state.

Reported-by: Alex Lemberg <Alex.Lemberg@sandisk.com>
Signed-off-by: Venkatraman S <svenkatr@ti.com>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 0b6141d..a7e2c4b 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -404,6 +404,7 @@ int mmc_interrupt_hpi(struct mmc_card *card)
 {
        int err;
        u32 status;
+       unsigned long prg_wait;
 
        BUG_ON(!card);
 
@@ -419,30 +420,38 @@ int mmc_interrupt_hpi(struct mmc_card *card)
                goto out;
        }
 
-       /*
-        * If the card status is in PRG-state, we can send the HPI command.
-        */
-       if (R1_CURRENT_STATE(status) == R1_STATE_PRG) {
-               do {
-                       /*
-                        * We don't know when the HPI command will finish
-                        * processing, so we need to resend HPI until out
-                        * of prg-state, and keep checking the card status
-                        * with SEND_STATUS.  If a timeout error occurs when
-                        * sending the HPI command, we are already out of
-                        * prg-state.
-                        */
-                       err = mmc_send_hpi_cmd(card, &status);
-                       if (err)
-                               pr_debug("%s: abort HPI (%d error)\n",
-                                        mmc_hostname(card->host), err);
+       switch (R1_CURRENT_STATE(status)) {
+       case R1_STATE_IDLE:
+       case R1_STATE_READY:
+       case R1_STATE_STBY:
+               /*
+                * In idle states, HPI is not needed and the caller
+                * can issue the next intended command immediately
+                */
+               goto out;
+       case R1_STATE_PRG:
+               break;
+       default:
+               /* In all other states, it's illegal to issue HPI */
+               pr_debug("%s: HPI cannot be sent. Card state=%d\n",
+                       mmc_hostname(card->host), R1_CURRENT_STATE(status));
+               err = -EINVAL;
+               goto out;
+       }
 
-                       err = mmc_send_status(card, &status);
-                       if (err)
-                               break;
-               } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
-       } else
-               pr_debug("%s: Left prg-state\n", mmc_hostname(card->host));
+       err = mmc_send_hpi_cmd(card, &status);
+       if (err)
+               goto out;
+
+       prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
+       do {
+               err = mmc_send_status(card, &status);
+
+               if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
+                       break;
+               if (time_after(jiffies, prg_wait))
+                       err = -ETIMEDOUT;
+       } while (!err);
 
 out:
        mmc_release_host(card->host);

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 69370f4..0ed2cc5 100644 (file)
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -569,7 +569,6 @@ int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
 
        cmd.opcode = opcode;
        cmd.arg = card->rca << 16 | 1;
-       cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
 
        err = mmc_wait_for_cmd(card->host, &cmd, 0);
        if (err) {