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openwrt/target/linux/brcm2708/patches-4.4/0224-Revert-bcm2835-sdhost-Adjust-to-core-clock-changes.patch
Álvaro Fernández Rojas 011f2c26f1 brcm2708: update linux 4.4 patches to latest version 
As usual these patches were extracted and rebased from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2016-12-04 12:32:04 +01:00

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9.6 KiB
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From 1537ae821b86a8d13c669e1fed2d20d87bb6d2dd Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 4 Apr 2016 12:35:51 +0100
Subject: [PATCH] Revert "bcm2835-sdhost: Adjust to core clock changes"
This reverts commit 4b89d07fd299a0f4e25321920cb74416ba2e638e.
---
drivers/mmc/host/Kconfig | 1 -
drivers/mmc/host/bcm2835-sdhost.c | 140 ++++++--------------------------------
2 files changed, 22 insertions(+), 119 deletions(-)
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -36,7 +36,6 @@ config MMC_BCM2835_PIO_DMA_BARRIER
config MMC_BCM2835_SDHOST
tristate "Support for the SDHost controller on BCM2708/9"
depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835
- depends on RASPBERRYPI_FIRMWARE
help
This selects the SDHost controller on BCM2835/6.
--- a/drivers/mmc/host/bcm2835-sdhost.c
+++ b/drivers/mmc/host/bcm2835-sdhost.c
@@ -50,10 +50,6 @@
#include <linux/of_dma.h>
#include <linux/time.h>
#include <linux/workqueue.h>
-#include <linux/cpufreq.h>
-#include <linux/semaphore.h>
-#include <soc/bcm2835/raspberrypi-firmware.h>
-
#define DRIVER_NAME "sdhost-bcm2835"
@@ -140,8 +136,6 @@
#define MHZ 1000000
-#define RPI_FIRMWARE_CLOCK_CORE 4
-
struct bcm2835_host {
spinlock_t lock;
@@ -157,9 +151,7 @@ struct bcm2835_host {
bool slow_card; /* Force 11-bit divisor */
- unsigned int max_clk; /* Max src clock freq */
- unsigned int min_clk; /* Min src clock freq */
- unsigned int cur_clk; /* Current src clock freq */
+ unsigned int max_clk; /* Max possible freq */
struct tasklet_struct finish_tasklet; /* Tasklet structures */
@@ -191,7 +183,6 @@ struct bcm2835_host {
unsigned int use_sbc:1; /* Send CMD23 */
unsigned int debug:1; /* Enable debug output */
- unsigned int variable_clock:1; /* The core clock may change */
/*DMA part*/
struct dma_chan *dma_chan_rxtx; /* DMA channel for reads and writes */
@@ -217,9 +208,6 @@ struct bcm2835_host {
u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */
u32 sectors; /* Cached card size in sectors */
-
- struct notifier_block cpufreq_nb; /* The cpufreq callback list item */
- struct semaphore cpufreq_semaphore; /* Interlock between SD activity and cpufreq changes */
};
#if ENABLE_LOG
@@ -239,10 +227,6 @@ static u32 sdhost_log_idx;
static spinlock_t log_lock;
static void __iomem *timer_base;
-static int bcm2835_sdhost_cpufreq_callback(struct notifier_block *nb,
- unsigned long action, void *data);
-static unsigned int get_core_clock(unsigned int mode);
-
#define LOG_ENTRIES (256*1)
#define LOG_SIZE (sizeof(LOG_ENTRY_T)*LOG_ENTRIES)
@@ -464,14 +448,20 @@ static void bcm2835_sdhost_reset(struct
static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
-static void bcm2835_sdhost_init(struct bcm2835_host *host)
+static void bcm2835_sdhost_init(struct bcm2835_host *host, int soft)
{
- pr_debug("bcm2835_sdhost_init()\n");
+ pr_debug("bcm2835_sdhost_init(%d)\n", soft);
/* Set interrupt enables */
host->hcfg = SDHCFG_BUSY_IRPT_EN;
bcm2835_sdhost_reset_internal(host);
+
+ if (soft) {
+ /* force clock reconfiguration */
+ host->clock = 0;
+ bcm2835_sdhost_set_ios(host->mmc, &host->mmc->ios);
+ }
}
static void bcm2835_sdhost_wait_transfer_complete(struct bcm2835_host *host)
@@ -1509,10 +1499,10 @@ static irqreturn_t bcm2835_sdhost_irq(in
return result;
}
-void bcm2835_sdhost_set_clock(struct bcm2835_host *host)
+void bcm2835_sdhost_set_clock(struct bcm2835_host *host, unsigned int clock)
{
int div = 0; /* Initialized for compiler warning */
- unsigned int clock = host->clock;
+ unsigned int input_clock = clock;
if (host->debug)
pr_info("%s: set_clock(%d)\n", mmc_hostname(host->mmc), clock);
@@ -1553,17 +1543,17 @@ void bcm2835_sdhost_set_clock(struct bcm
return;
}
- div = host->cur_clk / clock;
+ div = host->max_clk / clock;
if (div < 2)
div = 2;
- if ((host->cur_clk / div) > clock)
+ if ((host->max_clk / div) > clock)
div++;
div -= 2;
if (div > SDCDIV_MAX_CDIV)
div = SDCDIV_MAX_CDIV;
- clock = host->cur_clk / (div + 2);
+ clock = host->max_clk / (div + 2);
host->mmc->actual_clock = clock;
/* Calibrate some delays */
@@ -1571,7 +1561,7 @@ void bcm2835_sdhost_set_clock(struct bcm
host->ns_per_fifo_word = (1000000000/clock) *
((host->mmc->caps & MMC_CAP_4_BIT_DATA) ? 8 : 32);
- if (clock > host->clock) {
+ if (clock > input_clock) {
/* Save the closest value, to make it easier
to reduce in the event of error */
host->overclock_50 = (clock/MHZ);
@@ -1597,9 +1587,9 @@ void bcm2835_sdhost_set_clock(struct bcm
bcm2835_sdhost_write(host, host->mmc->actual_clock/2, SDTOUT);
if (host->debug)
- pr_info("%s: clock=%d -> cur_clk=%d, cdiv=%x (actual clock %d)\n",
- mmc_hostname(host->mmc), host->clock,
- host->cur_clk, host->cdiv, host->mmc->actual_clock);
+ pr_info("%s: clock=%d -> max_clk=%d, cdiv=%x (actual clock %d)\n",
+ mmc_hostname(host->mmc), input_clock,
+ host->max_clk, host->cdiv, host->mmc->actual_clock);
}
static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq)
@@ -1648,13 +1638,6 @@ static void bcm2835_sdhost_request(struc
(mrq->data->blocks > host->pio_limit))
bcm2835_sdhost_prepare_dma(host, mrq->data);
- if (host->variable_clock &&
- (down_killable(&host->cpufreq_semaphore) != 0)) {
- mrq->cmd->error = -EINTR;
- mmc_request_done(mmc, mrq);
- return;
- }
-
spin_lock_irqsave(&host->lock, flags);
WARN_ON(host->mrq != NULL);
@@ -1704,52 +1687,6 @@ static void bcm2835_sdhost_request(struc
spin_unlock_irqrestore(&host->lock, flags);
}
-static int bcm2835_sdhost_cpufreq_callback(struct notifier_block *nb,
- unsigned long action, void *data)
-{
- struct cpufreq_freqs *freq = data;
- struct bcm2835_host *host;
-
- host = container_of(nb, struct bcm2835_host, cpufreq_nb);
-
- if (freq->cpu == 0) {
- switch (action) {
- case CPUFREQ_PRECHANGE:
- if (down_killable(&host->cpufreq_semaphore) != 0)
- return NOTIFY_BAD;
- break;
- case CPUFREQ_POSTCHANGE:
- if (freq->new > freq->old)
- host->cur_clk = host->max_clk;
- else
- host->cur_clk = host->min_clk;
- bcm2835_sdhost_set_clock(host);
- up(&host->cpufreq_semaphore);
- break;
- default:
- break;
- }
- }
- return NOTIFY_OK;
-}
-
-static unsigned int get_core_clock(unsigned int mode)
-{
- struct rpi_firmware *fw = rpi_firmware_get(NULL);
- struct {
- u32 id;
- u32 val;
- } packet;
- int ret;
-
- packet.id = RPI_FIRMWARE_CLOCK_CORE;
- ret = rpi_firmware_property(fw, mode, &packet, sizeof(packet));
- if (ret)
- return 0;
-
- return packet.val;
-}
-
static void bcm2835_sdhost_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
@@ -1763,16 +1700,13 @@ static void bcm2835_sdhost_set_ios(struc
ios->clock, ios->power_mode, ios->bus_width,
ios->timing, ios->signal_voltage, ios->drv_type);
- if (ios->clock && !host->cur_clk)
- host->cur_clk = get_core_clock(RPI_FIRMWARE_GET_CLOCK_RATE);
-
spin_lock_irqsave(&host->lock, flags);
log_event("IOS<", ios->clock, 0);
if (!ios->clock || ios->clock != host->clock) {
+ bcm2835_sdhost_set_clock(host, ios->clock);
host->clock = ios->clock;
- bcm2835_sdhost_set_clock(host);
}
/* set bus width */
@@ -1861,7 +1795,7 @@ static void bcm2835_sdhost_tasklet_finis
host->overclock_50--;
pr_warn("%s: reducing overclock due to errors\n",
mmc_hostname(host->mmc));
- bcm2835_sdhost_set_clock(host);
+ bcm2835_sdhost_set_clock(host,50*MHZ);
mrq->cmd->error = -EILSEQ;
mrq->cmd->retries = 1;
}
@@ -1879,9 +1813,6 @@ static void bcm2835_sdhost_tasklet_finis
spin_unlock_irqrestore(&host->lock, flags);
- if (host->variable_clock)
- up(&host->cpufreq_semaphore);
-
if (terminate_chan)
{
int err = dmaengine_terminate_all(terminate_chan);
@@ -1984,10 +1915,10 @@ int bcm2835_sdhost_add_host(struct bcm28
setup_timer(&host->timer, bcm2835_sdhost_timeout,
(unsigned long)host);
- bcm2835_sdhost_init(host);
+ bcm2835_sdhost_init(host, 0);
ret = request_irq(host->irq, bcm2835_sdhost_irq, 0 /*IRQF_SHARED*/,
- mmc_hostname(mmc), host);
+ mmc_hostname(mmc), host);
if (ret) {
pr_err("%s: failed to request IRQ %d: %d\n",
mmc_hostname(mmc), host->irq, ret);
@@ -2022,7 +1953,6 @@ static int bcm2835_sdhost_probe(struct p
struct bcm2835_host *host;
struct mmc_host *mmc;
const __be32 *addr;
- unsigned int max_clk;
int ret;
pr_debug("bcm2835_sdhost_probe\n");
@@ -2132,28 +2062,6 @@ static int bcm2835_sdhost_probe(struct p
if (ret)
goto err;
- /* Query the core clock frequencies */
- host->min_clk = get_core_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE);
- max_clk = get_core_clock(RPI_FIRMWARE_GET_MAX_CLOCK_RATE);
- if (max_clk != host->max_clk) {
- pr_warn("%s: Expected max clock %d, found %d\n",
- mmc_hostname(mmc), host->max_clk, max_clk);
- host->max_clk = max_clk;
- }
-
- if (host->min_clk != host->max_clk) {
- host->cpufreq_nb.notifier_call =
- bcm2835_sdhost_cpufreq_callback;
- sema_init(&host->cpufreq_semaphore, 1);
- cpufreq_register_notifier(&host->cpufreq_nb,
- CPUFREQ_TRANSITION_NOTIFIER);
- host->variable_clock = 1;
- host->cur_clk = 0; /* Get this later */
- } else {
- host->variable_clock = 0;
- host->cur_clk = host->max_clk;
- }
-
platform_set_drvdata(pdev, host);
pr_debug("bcm2835_sdhost_probe -> OK\n");
@@ -2173,10 +2081,6 @@ static int bcm2835_sdhost_remove(struct
pr_debug("bcm2835_sdhost_remove\n");
- if (host->variable_clock)
- cpufreq_unregister_notifier(&host->cpufreq_nb,
- CPUFREQ_TRANSITION_NOTIFIER);
-
mmc_remove_host(host->mmc);
bcm2835_sdhost_set_power(host, false);
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