As is custom, use a big switch statement to transition
between the edges of the state machine inside
the ux500 ->busy_complete callback.
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
ChangeLog v6->v7:
- No changes.
ChangeLog v4->v6:
- No changes.
ChangeLog v3->v4:
- No changes.
ChangeLog v2->v3:
- Rebased.
ChangeLog v1->v2:
- No changes
---
drivers/mmc/host/mmci.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index f89e4c44ea04..d38ba9aa9be8 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -686,6 +686,12 @@ static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
goto out_ret_state;
}
+ /*
+ * The state transitions are encoded in a state machine crossing
+ * the edges in this switch statement.
+ */
+ switch (host->busy_state) {
+
/*
* Before unmasking for the busy end IRQ, confirm that the
* command was sent successfully. To keep track of having a
@@ -696,7 +702,7 @@ static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
* it starts signaling busy on DAT0, hence re-read the
* MMCISTATUS register here, to allow the busy bit to be set.
*/
- if (host->busy_state == MMCI_BUSY_DONE) {
+ case MMCI_BUSY_DONE:
/*
* Save the first status register read to be sure to catch
* all bits that may be lost will retrying. If the command
@@ -722,8 +728,7 @@ static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
writel(readl(base + MMCIMASK0) &
~host->variant->busy_detect_mask, base + MMCIMASK0);
host->busy_state = MMCI_BUSY_DONE;
- goto out_ret_state;
- }
+ break;
/*
* If there is a command in-progress that has been successfully
@@ -736,12 +741,11 @@ static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
* both the start and the end interrupts needs to be cleared,
* one after the other. So, clear the busy start IRQ here.
*/
- if (host->busy_state == MMCI_BUSY_WAITING_FOR_START_IRQ) {
+ case MMCI_BUSY_WAITING_FOR_START_IRQ:
if (status & host->variant->busy_detect_flag) {
host->busy_status |= status & (MCI_CMDSENT | MCI_CMDRESPEND);
writel(host->variant->busy_detect_mask, base + MMCICLEAR);
host->busy_state = MMCI_BUSY_WAITING_FOR_END_IRQ;
- goto out_ret_state;
} else {
dev_dbg(mmc_dev(host->mmc),
"lost busy status when waiting for busy start IRQ\n");
@@ -750,23 +754,24 @@ static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
~host->variant->busy_detect_mask, base + MMCIMASK0);
host->busy_state = MMCI_BUSY_DONE;
host->busy_status = 0;
- goto out_ret_state;
}
- }
+ break;
- if (host->busy_state == MMCI_BUSY_WAITING_FOR_END_IRQ) {
+ case MMCI_BUSY_WAITING_FOR_END_IRQ:
if (!(status & host->variant->busy_detect_flag)) {
host->busy_status |= status & (MCI_CMDSENT | MCI_CMDRESPEND);
host->busy_state = MMCI_BUSY_DONE;
- goto out_ret_state;
} else {
dev_dbg(mmc_dev(host->mmc),
"busy status still asserted when handling busy end IRQ - will keep waiting\n");
- goto out_ret_state;
}
- }
+ break;
- return true;
+ default:
+ dev_dbg(mmc_dev(host->mmc), "fell through on state %d\n",
+ host->busy_state);
+ break;
+ }
out_ret_state:
return (host->busy_state == MMCI_BUSY_DONE);
--
2.40.1
