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freifunkist-firmware/target/linux/brcm2708/patches-3.10/0026-Add-low-latency-mode-t...

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From fc153c5cb49f20f5e9644d92b8be064ed9159a16 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Sun, 12 May 2013 12:27:48 +0100
Subject: [PATCH 026/174] Add low-latency mode to sdcard driver. Disable with
sdhci-bcm2708.enable_llm=0. Thanks ddv2005.
---
drivers/mmc/host/sdhci-bcm2708.c | 17 ++--
drivers/mmc/host/sdhci.c | 165 ++++++++++++++++++++++++++++++---------
drivers/mmc/host/sdhci.h | 6 ++
include/linux/mmc/sdhci.h | 1 +
4 files changed, 145 insertions(+), 44 deletions(-)
--- a/drivers/mmc/host/sdhci-bcm2708.c
+++ b/drivers/mmc/host/sdhci-bcm2708.c
@@ -135,6 +135,7 @@ static bool allow_highspeed = 1;
static int emmc_clock_freq = BCM2708_EMMC_CLOCK_FREQ;
static bool sync_after_dma = 1;
static bool missing_status = 1;
+bool enable_llm = 1;
#if 0
static void hptime_test(void)
@@ -871,12 +872,11 @@ static irqreturn_t sdhci_bcm2708_dma_irq
struct sdhci_host *host = dev_id;
struct sdhci_bcm2708_priv *host_priv = SDHCI_HOST_PRIV(host);
u32 dma_cs; /* control and status register */
- unsigned long flags;
BUG_ON(NULL == dev_id);
BUG_ON(NULL == host_priv->dma_chan_base);
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock(host);
dma_cs = readl(host_priv->dma_chan_base + BCM2708_DMA_CS);
@@ -917,8 +917,7 @@ static irqreturn_t sdhci_bcm2708_dma_irq
result = IRQ_HANDLED;
}
-
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock(host);
return result;
}
@@ -1193,9 +1192,12 @@ static int sdhci_bcm2708_probe(struct pl
sdhci_bcm2708_ops.missing_status = sdhci_bcm2708_missing_status;
}
+ printk("sdhci: %s low-latency mode\n",enable_llm?"Enable":"Disable");
+
host->hw_name = "BCM2708_Arasan";
host->ops = &sdhci_bcm2708_ops;
host->irq = platform_get_irq(pdev, 0);
+ host->second_irq = 0;
host->quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
@@ -1256,12 +1258,13 @@ static int sdhci_bcm2708_probe(struct pl
}
host_priv->dma_chan = ret;
- ret = request_irq(host_priv->dma_irq, sdhci_bcm2708_dma_irq,
- IRQF_SHARED, DRIVER_NAME " (dma)", host);
+ ret = request_irq(host_priv->dma_irq, sdhci_bcm2708_dma_irq,0,//IRQF_SHARED,
+ DRIVER_NAME " (dma)", host);
if (ret) {
dev_err(&pdev->dev, "cannot set DMA IRQ\n");
goto err_add_dma_irq;
}
+ host->second_irq = host_priv->dma_irq;
DBG("DMA CBs %p handle %08X DMA%d %p DMA IRQ %d\n",
host_priv->cb_base, (unsigned)host_priv->cb_handle,
host_priv->dma_chan, host_priv->dma_chan_base,
@@ -1384,6 +1387,7 @@ module_param(allow_highspeed, bool, 0444
module_param(emmc_clock_freq, int, 0444);
module_param(sync_after_dma, bool, 0444);
module_param(missing_status, bool, 0444);
+module_param(enable_llm, bool, 0444);
MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
MODULE_AUTHOR("Broadcom <info@broadcom.com>");
@@ -1394,5 +1398,6 @@ MODULE_PARM_DESC(allow_highspeed, "Allow
MODULE_PARM_DESC(emmc_clock_freq, "Specify the speed of emmc clock");
MODULE_PARM_DESC(sync_after_dma, "Block in driver until dma complete");
MODULE_PARM_DESC(missing_status, "Use the missing status quirk");
+MODULE_PARM_DESC(enable_llm, "Enable low-latency mode");
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -124,6 +124,91 @@ static void sdhci_dumpregs(struct sdhci_
* Low level functions *
* *
\*****************************************************************************/
+extern bool enable_llm;
+static int sdhci_locked=0;
+void sdhci_spin_lock(struct sdhci_host *host)
+{
+ spin_lock(&host->lock);
+#ifdef CONFIG_PREEMPT
+ if(enable_llm)
+ {
+ disable_irq_nosync(host->irq);
+ if(host->second_irq)
+ disable_irq_nosync(host->second_irq);
+ local_irq_enable();
+ }
+#endif
+}
+
+void sdhci_spin_unlock(struct sdhci_host *host)
+{
+#ifdef CONFIG_PREEMPT
+ if(enable_llm)
+ {
+ local_irq_disable();
+ if(host->second_irq)
+ enable_irq(host->second_irq);
+ enable_irq(host->irq);
+ }
+#endif
+ spin_unlock(&host->lock);
+}
+
+void sdhci_spin_lock_irqsave(struct sdhci_host *host,unsigned long *flags)
+{
+#ifdef CONFIG_PREEMPT
+ if(enable_llm)
+ {
+ while(sdhci_locked)
+ {
+ preempt_schedule();
+ }
+ spin_lock_irqsave(&host->lock,*flags);
+ disable_irq(host->irq);
+ if(host->second_irq)
+ disable_irq(host->second_irq);
+ local_irq_enable();
+ }
+ else
+#endif
+ spin_lock_irqsave(&host->lock,*flags);
+}
+
+void sdhci_spin_unlock_irqrestore(struct sdhci_host *host,unsigned long flags)
+{
+#ifdef CONFIG_PREEMPT
+ if(enable_llm)
+ {
+ local_irq_disable();
+ if(host->second_irq)
+ enable_irq(host->second_irq);
+ enable_irq(host->irq);
+ }
+#endif
+ spin_unlock_irqrestore(&host->lock,flags);
+}
+
+static void sdhci_spin_enable_schedule(struct sdhci_host *host)
+{
+#ifdef CONFIG_PREEMPT
+ if(enable_llm)
+ {
+ sdhci_locked = 1;
+ preempt_enable();
+ }
+#endif
+}
+
+static void sdhci_spin_disable_schedule(struct sdhci_host *host)
+{
+#ifdef CONFIG_PREEMPT
+ if(enable_llm)
+ {
+ preempt_disable();
+ sdhci_locked = 0;
+ }
+#endif
+}
static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
{
@@ -289,7 +374,7 @@ static void sdhci_led_control(struct led
struct sdhci_host *host = container_of(led, struct sdhci_host, led);
unsigned long flags;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
if (host->runtime_suspended)
goto out;
@@ -299,7 +384,7 @@ static void sdhci_led_control(struct led
else
sdhci_activate_led(host);
out:
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
#endif
@@ -1007,7 +1092,9 @@ static void sdhci_send_command(struct sd
return;
}
timeout--;
+ sdhci_spin_enable_schedule(host);
mdelay(1);
+ sdhci_spin_disable_schedule(host);
}
DBG("send cmd %d - wait 0x%X irq 0x%x\n", cmd->opcode, mask,
sdhci_readl(host, SDHCI_INT_STATUS));
@@ -1234,7 +1321,9 @@ clock_set:
return;
}
timeout--;
+ sdhci_spin_enable_schedule(host);
mdelay(1);
+ sdhci_spin_disable_schedule(host);
}
clk |= SDHCI_CLOCK_CARD_EN;
@@ -1330,7 +1419,7 @@ static void sdhci_request(struct mmc_hos
sdhci_runtime_pm_get(host);
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
WARN_ON(host->mrq != NULL);
@@ -1388,9 +1477,9 @@ static void sdhci_request(struct mmc_hos
mmc->card->type == MMC_TYPE_MMC ?
MMC_SEND_TUNING_BLOCK_HS200 :
MMC_SEND_TUNING_BLOCK;
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
sdhci_execute_tuning(mmc, tuning_opcode);
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
/* Restore original mmc_request structure */
host->mrq = mrq;
@@ -1404,7 +1493,7 @@ static void sdhci_request(struct mmc_hos
}
mmiowb();
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
@@ -1413,10 +1502,10 @@ static void sdhci_do_set_ios(struct sdhc
int vdd_bit = -1;
u8 ctrl;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
if (host->flags & SDHCI_DEVICE_DEAD) {
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
if (host->vmmc && ios->power_mode == MMC_POWER_OFF)
mmc_regulator_set_ocr(host->mmc, host->vmmc, 0);
return;
@@ -1443,9 +1532,9 @@ static void sdhci_do_set_ios(struct sdhc
vdd_bit = sdhci_set_power(host, ios->vdd);
if (host->vmmc && vdd_bit != -1) {
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
mmc_regulator_set_ocr(host->mmc, host->vmmc, vdd_bit);
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
}
if (host->ops->platform_send_init_74_clocks)
@@ -1583,7 +1672,7 @@ static void sdhci_do_set_ios(struct sdhc
sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
mmiowb();
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
@@ -1631,7 +1720,7 @@ static int sdhci_check_ro(struct sdhci_h
unsigned long flags;
int is_readonly;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
if (host->flags & SDHCI_DEVICE_DEAD)
is_readonly = 0;
@@ -1641,7 +1730,7 @@ static int sdhci_check_ro(struct sdhci_h
is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
& SDHCI_WRITE_PROTECT);
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
/* This quirk needs to be replaced by a callback-function later */
return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
@@ -1714,9 +1803,9 @@ static void sdhci_enable_sdio_irq(struct
struct sdhci_host *host = mmc_priv(mmc);
unsigned long flags;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
sdhci_enable_sdio_irq_nolock(host, enable);
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
@@ -2060,7 +2149,7 @@ static void sdhci_card_event(struct mmc_
struct sdhci_host *host = mmc_priv(mmc);
unsigned long flags;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
/* Check host->mrq first in case we are runtime suspended */
if (host->mrq &&
@@ -2077,7 +2166,7 @@ static void sdhci_card_event(struct mmc_
tasklet_schedule(&host->finish_tasklet);
}
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
static const struct mmc_host_ops sdhci_ops = {
@@ -2116,14 +2205,14 @@ static void sdhci_tasklet_finish(unsigne
host = (struct sdhci_host*)param;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
/*
* If this tasklet gets rescheduled while running, it will
* be run again afterwards but without any active request.
*/
if (!host->mrq) {
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
return;
}
@@ -2161,7 +2250,7 @@ static void sdhci_tasklet_finish(unsigne
#endif
mmiowb();
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
mmc_request_done(host->mmc, mrq);
sdhci_runtime_pm_put(host);
@@ -2174,7 +2263,7 @@ static void sdhci_timeout_timer(unsigned
host = (struct sdhci_host*)data;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
if (host->mrq) {
pr_err("%s: Timeout waiting for hardware "
@@ -2195,7 +2284,7 @@ static void sdhci_timeout_timer(unsigned
}
mmiowb();
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
static void sdhci_tuning_timer(unsigned long data)
@@ -2205,11 +2294,11 @@ static void sdhci_tuning_timer(unsigned
host = (struct sdhci_host *)data;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
host->flags |= SDHCI_NEEDS_RETUNING;
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
/*****************************************************************************\
@@ -2433,10 +2522,10 @@ static irqreturn_t sdhci_irq(int irq, vo
u32 intmask, unexpected = 0;
int cardint = 0, max_loops = 16;
- spin_lock(&host->lock);
+ sdhci_spin_lock(host);
if (host->runtime_suspended) {
- spin_unlock(&host->lock);
+ sdhci_spin_unlock(host);
pr_warning("%s: got irq while runtime suspended\n",
mmc_hostname(host->mmc));
return IRQ_HANDLED;
@@ -2540,7 +2629,7 @@ again:
if (intmask && --max_loops)
goto again;
out:
- spin_unlock(&host->lock);
+ sdhci_spin_unlock(host);
if (unexpected) {
pr_err("%s: Unexpected interrupt 0x%08x.\n",
@@ -2702,15 +2791,15 @@ int sdhci_runtime_suspend_host(struct sd
host->flags &= ~SDHCI_NEEDS_RETUNING;
}
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK);
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
synchronize_irq(host->irq);
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
host->runtime_suspended = true;
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
return ret;
}
@@ -2736,16 +2825,16 @@ int sdhci_runtime_resume_host(struct sdh
sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
if ((host_flags & SDHCI_PV_ENABLED) &&
!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
sdhci_enable_preset_value(host, true);
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
/* Set the re-tuning expiration flag */
if (host->flags & SDHCI_USING_RETUNING_TIMER)
host->flags |= SDHCI_NEEDS_RETUNING;
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
host->runtime_suspended = false;
@@ -2756,7 +2845,7 @@ int sdhci_runtime_resume_host(struct sdh
/* Enable Card Detection */
sdhci_enable_card_detection(host);
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
return ret;
}
@@ -3248,7 +3337,7 @@ int sdhci_add_host(struct sdhci_host *ho
host->tuning_timer.function = sdhci_tuning_timer;
}
- ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
+ ret = request_irq(host->irq, sdhci_irq, 0,//IRQF_SHARED,
mmc_hostname(mmc), host);
if (ret) {
pr_err("%s: Failed to request IRQ %d: %d\n",
@@ -3312,7 +3401,7 @@ void sdhci_remove_host(struct sdhci_host
unsigned long flags;
if (dead) {
- spin_lock_irqsave(&host->lock, flags);
+ sdhci_spin_lock_irqsave(host, &flags);
host->flags |= SDHCI_DEVICE_DEAD;
@@ -3324,7 +3413,7 @@ void sdhci_remove_host(struct sdhci_host
tasklet_schedule(&host->finish_tasklet);
}
- spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_spin_unlock_irqrestore(host, flags);
}
sdhci_disable_card_detection(host);
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -441,4 +441,10 @@ extern int sdhci_runtime_suspend_host(st
extern int sdhci_runtime_resume_host(struct sdhci_host *host);
#endif
+extern void sdhci_spin_lock_irqsave(struct sdhci_host *host,unsigned long *flags);
+extern void sdhci_spin_unlock_irqrestore(struct sdhci_host *host,unsigned long flags);
+extern void sdhci_spin_lock(struct sdhci_host *host);
+extern void sdhci_spin_unlock(struct sdhci_host *host);
+
+
#endif /* __SDHCI_HW_H */
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -97,6 +97,7 @@ struct sdhci_host {
#define SDHCI_QUIRK2_PRESET_VALUE_BROKEN (1<<3)
int irq; /* Device IRQ */
+ int second_irq; /* Additional IRQ to disable/enable in low-latency mode */
void __iomem *ioaddr; /* Mapped address */
const struct sdhci_ops *ops; /* Low level hw interface */