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mmc: cmdq_hci: Add retry mechanism for cmdq_halt

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Currently all functions which calls cmdq_halt relies upon HALT
to pass other wise considers it as a FATAL error (like clk scaling).

So add retry mechanism in halt - retry if halt completion
timesout & HALT also did not complete(by doing register read).

Change-Id: I59e199681e46085f804636f4c07249e6f21de1d5
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
This commit is contained in:
Ritesh Harjani 2015-09-15 19:21:32 +05:30 • committed by Subhash Jadavani
parent 9a4df9847e
commit 24bd8b95d9
1 changed files with 17 additions and 7 deletions
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24
drivers/mmc/host/cmdq_hci.c
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@ -778,17 +778,27 @@ static int cmdq_halt(struct mmc_host *mmc, bool halt)
{
struct cmdq_host *cq_host = (struct cmdq_host *)mmc_cmdq_private(mmc);
u32 ret = 0;
int retries = 3;
cmdq_runtime_pm_get(cq_host);
if (halt) {
cmdq_writel(cq_host, cmdq_readl(cq_host, CQCTL) | HALT,
CQCTL);
ret = wait_for_completion_timeout(&cq_host->halt_comp,
while (retries) {
cmdq_writel(cq_host, cmdq_readl(cq_host, CQCTL) | HALT,
CQCTL);
ret = wait_for_completion_timeout(&cq_host->halt_comp,
msecs_to_jiffies(HALT_TIMEOUT_MS));
/* halt done: re-enable legacy interrupts */
if (cq_host->ops->clear_set_irqs)
cq_host->ops->clear_set_irqs(mmc, false);
ret = ret ? 0 : -ETIMEDOUT;
if (!ret && !(cmdq_readl(cq_host, CQCTL) & HALT)) {
retries--;
continue;
} else {
/* halt done: re-enable legacy interrupts */
if (cq_host->ops->clear_set_irqs)
cq_host->ops->clear_set_irqs(mmc,
false);
break;
}
}
return retries ? 0 : -ETIMEDOUT;
} else {
if (cq_host->ops->set_data_timeout)
cq_host->ops->set_data_timeout(mmc, 0xf);