20402106a3
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>
107 lines
3.4 KiB
Diff
107 lines
3.4 KiB
Diff
From f900cc706eca16b68d335810173b253229109ec5 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Mon, 11 Apr 2016 12:50:58 +0100
|
|
Subject: [PATCH 234/423] bcm2835-sdhost: Reset the clock in task context
|
|
|
|
Since reprogramming the clock can now involve a round-trip to the
|
|
firmware it must not be done at atomic context, and a tasklet
|
|
is not a task.
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
---
|
|
drivers/mmc/host/bcm2835-sdhost.c | 25 ++++++++++++++++++-------
|
|
1 file changed, 18 insertions(+), 7 deletions(-)
|
|
|
|
--- a/drivers/mmc/host/bcm2835-sdhost.c
|
|
+++ b/drivers/mmc/host/bcm2835-sdhost.c
|
|
@@ -185,6 +185,7 @@ struct bcm2835_host {
|
|
|
|
unsigned int debug:1; /* Enable debug output */
|
|
unsigned int firmware_sets_cdiv:1; /* Let the firmware manage the clock */
|
|
+ unsigned int reset_clock:1; /* Reset the clock fore the next request */
|
|
|
|
/*DMA part*/
|
|
struct dma_chan *dma_chan_rxtx; /* DMA channel for reads and writes */
|
|
@@ -1505,6 +1506,7 @@ void bcm2835_sdhost_set_clock(struct bcm
|
|
{
|
|
int div = 0; /* Initialized for compiler warning */
|
|
unsigned int input_clock = clock;
|
|
+ unsigned long flags;
|
|
|
|
if (host->debug)
|
|
pr_info("%s: set_clock(%d)\n", mmc_hostname(host->mmc), clock);
|
|
@@ -1544,13 +1546,17 @@ void bcm2835_sdhost_set_clock(struct bcm
|
|
&msg, sizeof(msg));
|
|
|
|
clock = max(msg[1], msg[2]);
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
} else {
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
if (clock < 100000) {
|
|
/* Can't stop the clock, but make it as slow as
|
|
* possible to show willing
|
|
*/
|
|
host->cdiv = SDCDIV_MAX_CDIV;
|
|
bcm2835_sdhost_write(host, host->cdiv, SDCDIV);
|
|
+ mmiowb();
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
return;
|
|
}
|
|
|
|
@@ -1605,6 +1611,11 @@ void bcm2835_sdhost_set_clock(struct bcm
|
|
bcm2835_sdhost_write(host, clock/2, SDTOUT);
|
|
|
|
host->mmc->actual_clock = clock;
|
|
+ host->clock = input_clock;
|
|
+ host->reset_clock = 0;
|
|
+
|
|
+ mmiowb();
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static void bcm2835_sdhost_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
@@ -1653,6 +1664,9 @@ static void bcm2835_sdhost_request(struc
|
|
(mrq->data->blocks > host->pio_limit))
|
|
bcm2835_sdhost_prepare_dma(host, mrq->data);
|
|
|
|
+ if (host->reset_clock)
|
|
+ bcm2835_sdhost_set_clock(host, host->clock);
|
|
+
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
WARN_ON(host->mrq != NULL);
|
|
@@ -1731,14 +1745,12 @@ static void bcm2835_sdhost_set_ios(struc
|
|
|
|
bcm2835_sdhost_write(host, host->hcfg, SDHCFG);
|
|
|
|
- if (!ios->clock || ios->clock != host->clock) {
|
|
- bcm2835_sdhost_set_clock(host, ios->clock);
|
|
- host->clock = ios->clock;
|
|
- }
|
|
-
|
|
mmiowb();
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
+
|
|
+ if (!ios->clock || ios->clock != host->clock)
|
|
+ bcm2835_sdhost_set_clock(host, ios->clock);
|
|
}
|
|
|
|
static struct mmc_host_ops bcm2835_sdhost_ops = {
|
|
@@ -1810,7 +1822,7 @@ 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,50*MHZ);
|
|
+ host->reset_clock = 1;
|
|
mrq->cmd->error = -EILSEQ;
|
|
mrq->cmd->retries = 1;
|
|
}
|
|
@@ -1979,7 +1991,6 @@ static int bcm2835_sdhost_probe(struct p
|
|
mmc->ops = &bcm2835_sdhost_ops;
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc;
|
|
- host->cmd_quick_poll_retries = 0;
|
|
host->pio_timeout = msecs_to_jiffies(500);
|
|
host->pio_limit = 1;
|
|
host->max_delay = 1; /* Warn if over 1ms */
|