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Message-ID: <20191008095604.20675-2-ludovic.Barre@st.com>
Date: Tue, 8 Oct 2019 11:56:02 +0200
From: Ludovic Barre <ludovic.Barre@...com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
Rob Herring <robh+dt@...nel.org>
CC: <srinivas.kandagatla@...aro.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-mmc@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH V7 1/3] mmc: mmci: add hardware busy timeout feature
From: Ludovic Barre <ludovic.barre@...com>
In the stm32_sdmmc variant, the datatimer is active not only during
data transfers with the DPSM, but also while waiting for the busyend
IRQs from commands having the MMC_RSP_BUSY flag set. This leads to an
incorrect IRQ being raised to signal MCI_DATATIMEOUT error, which
simply breaks the behaviour.
Address this by updating the datatimer value before sending a command
having the MMC_RSP_BUSY flag set. To inform the mmc core about the
maximum supported busy timeout, which also depends on the current
clock rate, set ->max_busy_timeout (in ms).
Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
drivers/mmc/host/mmci.c | 42 ++++++++++++++++++++++++++++++++++++-----
drivers/mmc/host/mmci.h | 3 +++
2 files changed, 40 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index e14003e52058..ed0b40287dea 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1075,6 +1075,7 @@ static void
mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
{
void __iomem *base = host->base;
+ unsigned long long clks;
dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
cmd->opcode, cmd->arg, cmd->flags);
@@ -1097,6 +1098,16 @@ mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
else
c |= host->variant->cmdreg_srsp;
}
+
+ if (host->variant->busy_timeout && cmd->flags & MMC_RSP_BUSY) {
+ if (!cmd->busy_timeout)
+ cmd->busy_timeout = 10 * MSEC_PER_SEC;
+
+ clks = (unsigned long long)cmd->busy_timeout * host->cclk;
+ do_div(clks, MSEC_PER_SEC);
+ writel_relaxed(clks, host->base + MMCIDATATIMER);
+ }
+
if (/*interrupt*/0)
c |= MCI_CPSM_INTERRUPT;
@@ -1201,6 +1212,7 @@ static void
mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
unsigned int status)
{
+ u32 err_msk = MCI_CMDCRCFAIL | MCI_CMDTIMEOUT;
void __iomem *base = host->base;
bool sbc, busy_resp;
@@ -1215,8 +1227,11 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
* handling. Note that we tag on any latent IRQs postponed
* due to waiting for busy status.
*/
- if (!((status|host->busy_status) &
- (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND)))
+ if (host->variant->busy_timeout && busy_resp)
+ err_msk |= MCI_DATATIMEOUT;
+
+ if (!((status | host->busy_status) &
+ (err_msk | MCI_CMDSENT | MCI_CMDRESPEND)))
return;
/* Handle busy detection on DAT0 if the variant supports it. */
@@ -1235,8 +1250,7 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
* while, to allow it to be set, but tests indicates that it
* isn't needed.
*/
- if (!host->busy_status &&
- !(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) &&
+ if (!host->busy_status && !(status & err_msk) &&
(readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) {
writel(readl(base + MMCIMASK0) |
@@ -1290,6 +1304,9 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
cmd->error = -ETIMEDOUT;
} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
cmd->error = -EILSEQ;
+ } else if (host->variant->busy_timeout && busy_resp &&
+ status & MCI_DATATIMEOUT) {
+ cmd->error = -ETIMEDOUT;
} else {
cmd->resp[0] = readl(base + MMCIRESPONSE0);
cmd->resp[1] = readl(base + MMCIRESPONSE1);
@@ -1583,6 +1600,20 @@ static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
spin_unlock_irqrestore(&host->lock, flags);
}
+static void mmci_set_max_busy_timeout(struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ u32 max_busy_timeout = 0;
+
+ if (!host->variant->busy_detect)
+ return;
+
+ if (host->variant->busy_timeout && mmc->actual_clock)
+ max_busy_timeout = ~0UL / (mmc->actual_clock / MSEC_PER_SEC);
+
+ mmc->max_busy_timeout = max_busy_timeout;
+}
+
static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmci_host *host = mmc_priv(mmc);
@@ -1687,6 +1718,8 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
else
mmci_set_clkreg(host, ios->clock);
+ mmci_set_max_busy_timeout(mmc);
+
if (host->ops && host->ops->set_pwrreg)
host->ops->set_pwrreg(host, pwr);
else
@@ -1957,7 +1990,6 @@ static int mmci_probe(struct amba_device *dev,
mmci_write_datactrlreg(host,
host->variant->busy_dpsm_flag);
mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
- mmc->max_busy_timeout = 0;
}
/* Prepare a CMD12 - needed to clear the DPSM on some variants. */
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 833236ecb31e..d8b7f6774e8f 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -287,6 +287,8 @@ struct mmci_host;
* @signal_direction: input/out direction of bus signals can be indicated
* @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock
* @busy_detect: true if the variant supports busy detection on DAT0.
+ * @busy_timeout: true if the variant starts data timer when the DPSM
+ * enter in Wait_R or Busy state.
* @busy_dpsm_flag: bitmask enabling busy detection in the DPSM
* @busy_detect_flag: bitmask identifying the bit in the MMCISTATUS register
* indicating that the card is busy
@@ -333,6 +335,7 @@ struct variant_data {
u8 signal_direction:1;
u8 pwrreg_clkgate:1;
u8 busy_detect:1;
+ u8 busy_timeout:1;
u32 busy_dpsm_flag;
u32 busy_detect_flag;
u32 busy_detect_mask;
--
2.17.1
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