From: Jeremy McNicoll <jeremymc@redhat.com>
To: linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
devicetree@vger.kernel.org, linux-mmc@vger.kernel.org
Cc: andy.gross@linaro.org, sboyd@codeaurora.org, robh@kernel.org,
arnd@arndb.de, bjorn.andersson@linaro.org,
riteshh@codeaurora.org, git@kchr.de, ulf.hansson@linaro.org,
jszhang@marvell.com, jeremymc@redhat.com
Subject: [PATCH V3 2/6] sdhci: Add quirk for delayed IRQ ACK
Date: Tue, 24 Jan 2017 01:36:24 -0800 [thread overview]
Message-ID: <1485250588-24698-3-git-send-email-jeremymc@redhat.com> (raw)
In-Reply-To: <1485250588-24698-1-git-send-email-jeremymc@redhat.com>
On msm8992 it has been observed that IRQs were not getting
ACK'd correctly when clocked at speeds greater than 400KHz.
Signed-off-by: Jeremy McNicoll <jeremymc@redhat.com>
---
drivers/mmc/host/sdhci-msm.c | 7 +++++++
drivers/mmc/host/sdhci.c | 12 ++++++++++--
drivers/mmc/host/sdhci.h | 2 ++
3 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index f3f3fb3..11dc389 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -1304,6 +1304,13 @@ static int sdhci_msm_probe(struct platform_device *pdev)
CORE_VENDOR_SPEC_CAPABILITIES0);
}
+ /* Enable delayed IRQ handling workaround on 8992 */
+ if (core_major == 1 && core_minor == 0x3e) {
+ /* Add 40us delay in interrupt handler when operating
+ * at initialization frequency of 400KHz. */
+ host->quirks2 |= SDHCI_QUIRK2_SLOW_INT_CLR;
+ }
+
/* Setup IRQ for handling power/voltage tasks with PMIC */
msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq");
if (msm_host->pwr_irq < 0) {
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 06dfac2..68a21a3 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2742,11 +2742,19 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
result = IRQ_WAKE_THREAD;
}
- if (intmask & SDHCI_INT_CMD_MASK)
+ if (intmask & SDHCI_INT_CMD_MASK) {
+ if ((host->quirks2 & SDHCI_QUIRK2_SLOW_INT_CLR) && (host->clock <= 400000)) {
+ udelay(40);
+ }
sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
+ }
- if (intmask & SDHCI_INT_DATA_MASK)
+ if (intmask & SDHCI_INT_DATA_MASK) {
+ if ((host->quirks2 & SDHCI_QUIRK2_SLOW_INT_CLR) && (host->clock <= 400000)) {
+ udelay(40);
+ }
sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
+ }
if (intmask & SDHCI_INT_BUS_POWER)
pr_err("%s: Card is consuming too much power!\n",
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 400f3a1..7fa1004 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -24,6 +24,8 @@
* Controller registers
*/
+#define SDHCI_QUIRK2_SLOW_INT_CLR (1<<5)
+
#define SDHCI_DMA_ADDRESS 0x00
#define SDHCI_ARGUMENT2 SDHCI_DMA_ADDRESS
--
2.6.1
next prev parent reply other threads:[~2017-01-24 9:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-24 9:36 [PATCH V3 0/6] Enable onboard SDHCI for Nexus 5X (msm8992) Jeremy McNicoll
2017-01-24 9:36 ` [PATCH V3 1/6] dt-bindings: qcom: clk: Add missing binding for SDCHI enablement on Nexus 5X/6P Jeremy McNicoll
2017-01-27 0:24 ` Stephen Boyd
2017-01-26 21:58 ` Jeremy McNicoll
2017-01-24 9:36 ` Jeremy McNicoll [this message]
2017-01-25 10:18 ` [PATCH V3 2/6] sdhci: Add quirk for delayed IRQ ACK Ritesh Harjani
2017-01-26 22:32 ` Jeremy McNicoll
2017-01-24 9:36 ` [PATCH V3 3/6] arm64: dts: msm8992 add fixed regulator Jeremy McNicoll
2017-01-24 9:36 ` [PATCH V3 4/6] arm64: dts: smem enablement for msm8992 Jeremy McNicoll
2017-01-24 9:36 ` [PATCH V3 5/6] dts: arm64: Enable onboard SDHCI on msm8992 Jeremy McNicoll
2017-01-24 9:36 ` [PATCH V3 6/6] dts: doc: rename rpm_requests to respect DT naming conventions Jeremy McNicoll
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