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As usual, this patches were taken (and rebased) from https://github.com/raspberrypi/linux/commits/rpi-4.1.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 47258
293 lines
8.8 KiB
Diff
293 lines
8.8 KiB
Diff
From 8509eb475ed00c7d581cf05866a27fa48c4c007c Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 25 Jun 2015 08:47:09 +0100
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Subject: [PATCH 092/203] bcm2835-sdhost: Further improve overclock back-off
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---
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drivers/mmc/host/bcm2835-sdhost.c | 144 +++++++++++++++++++++-----------------
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1 file changed, 78 insertions(+), 66 deletions(-)
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--- a/drivers/mmc/host/bcm2835-sdhost.c
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+++ b/drivers/mmc/host/bcm2835-sdhost.c
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@@ -161,8 +161,6 @@ struct bcm2835_host {
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unsigned int use_busy:1; /* Wait for busy interrupt */
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- unsigned int reduce_overclock:1; /* ...at the next opportunity */
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-
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unsigned int debug:1; /* Enable debug output */
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u32 thread_isr;
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@@ -466,36 +464,25 @@ static void bcm2835_sdhost_dma_complete(
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spin_unlock_irqrestore(&host->lock, flags);
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}
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-static bool data_transfer_wait(struct bcm2835_host *host, const char *caller)
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+static bool data_transfer_wait(struct bcm2835_host *host)
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{
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unsigned long timeout = 1000000;
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- u32 hsts;
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while (timeout)
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{
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- hsts = bcm2835_sdhost_read(host, SDHSTS);
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- if (hsts & (SDHSTS_TRANSFER_ERROR_MASK |
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- SDHSTS_DATA_FLAG)) {
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- bcm2835_sdhost_write(host, SDHSTS_TRANSFER_ERROR_MASK,
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- SDHSTS);
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+ u32 sdhsts = bcm2835_sdhost_read(host, SDHSTS);
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+ if (sdhsts & SDHSTS_DATA_FLAG) {
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+ bcm2835_sdhost_write(host, SDHSTS_DATA_FLAG, SDHSTS);
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break;
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}
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timeout--;
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}
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-
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- if (hsts & (SDHSTS_CRC16_ERROR |
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- SDHSTS_CRC7_ERROR |
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- SDHSTS_FIFO_ERROR)) {
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- pr_err("%s: data error in %s - HSTS %x\n",
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- mmc_hostname(host->mmc), caller, hsts);
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- host->data->error = -EILSEQ;
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- return false;
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- } else if ((timeout == 0) ||
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- (hsts & (SDHSTS_CMD_TIME_OUT |
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- SDHSTS_REW_TIME_OUT))) {
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- pr_err("%s: timeout in %s - HSTS %x\n",
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- mmc_hostname(host->mmc), caller, hsts);
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- host->data->error = -ETIMEDOUT;
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- return false;
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+ if (timeout == 0) {
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+ pr_err("%s: Data %s timeout\n",
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+ mmc_hostname(host->mmc),
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+ (host->data->flags & MMC_DATA_READ) ? "read" : "write");
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+ bcm2835_sdhost_dumpregs(host);
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+ host->data->error = -ETIMEDOUT;
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+ return false;
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}
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return true;
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}
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@@ -523,7 +510,7 @@ static void bcm2835_sdhost_read_block_pi
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buf = (u32 *)host->sg_miter.addr;
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while (len) {
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- if (!data_transfer_wait(host, "read_block_pio"))
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+ if (!data_transfer_wait(host))
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break;
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*(buf++) = bcm2835_sdhost_read(host, SDDATA);
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@@ -562,7 +549,7 @@ static void bcm2835_sdhost_write_block_p
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buf = host->sg_miter.addr;
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while (len) {
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- if (!data_transfer_wait(host, "write_block_pio"))
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+ if (!data_transfer_wait(host))
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break;
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bcm2835_sdhost_write(host, *(buf++), SDDATA);
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@@ -581,13 +568,33 @@ static void bcm2835_sdhost_write_block_p
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static void bcm2835_sdhost_transfer_pio(struct bcm2835_host *host)
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{
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+ u32 sdhsts;
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+ bool is_read;
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BUG_ON(!host->data);
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- if (host->data->flags & MMC_DATA_READ) {
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+ is_read = (host->data->flags & MMC_DATA_READ) != 0;
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+ if (is_read)
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bcm2835_sdhost_read_block_pio(host);
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- } else {
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+ else
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bcm2835_sdhost_write_block_pio(host);
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+ sdhsts = bcm2835_sdhost_read(host, SDHSTS);
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+ if (sdhsts & (SDHSTS_CRC16_ERROR |
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+ SDHSTS_CRC7_ERROR |
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+ SDHSTS_FIFO_ERROR)) {
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+ pr_err("%s: %s transfer error - HSTS %x\n",
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+ mmc_hostname(host->mmc),
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+ is_read ? "read" : "write",
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+ sdhsts);
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+ host->data->error = -EILSEQ;
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+ } else if ((sdhsts & (SDHSTS_CMD_TIME_OUT |
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+ SDHSTS_REW_TIME_OUT))) {
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+ pr_err("%s: %s timeout error - HSTS %x\n",
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+ mmc_hostname(host->mmc),
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+ is_read ? "read" : "write",
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+ sdhsts);
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+ host->data->error = -ETIMEDOUT;
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+ } else if (!is_read && !host->data->error) {
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/* Start a timer in case a transfer error occurs because
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there is no error interrupt */
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mod_timer(&host->pio_timer, jiffies + host->pio_timeout);
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@@ -701,8 +708,9 @@ static void bcm2835_sdhost_prepare_data(
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void bcm2835_sdhost_send_command(struct bcm2835_host *host, struct mmc_command *cmd)
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{
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- u32 sdcmd;
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+ u32 sdcmd, sdhsts;
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unsigned long timeout;
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+ int delay;
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WARN_ON(host->cmd);
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@@ -719,8 +727,8 @@ void bcm2835_sdhost_send_command(struct
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mmc_hostname(host->mmc),
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cmd->opcode, cmd->arg, cmd->flags);
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- /* Wait max 10 ms */
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- timeout = 1000;
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+ /* Wait max 100 ms */
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+ timeout = 10000;
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while (bcm2835_sdhost_read(host, SDCMD) & SDCMD_NEW_FLAG) {
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if (timeout == 0) {
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@@ -735,8 +743,9 @@ void bcm2835_sdhost_send_command(struct
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udelay(10);
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}
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- if ((1000-timeout)/100 > 1 && (1000-timeout)/100 > host->max_delay) {
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- host->max_delay = (1000-timeout)/100;
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+ delay = (10000 - timeout)/100;
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+ if (delay > host->max_delay) {
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+ host->max_delay = delay;
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pr_warning("%s: controller hung for %d ms\n",
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mmc_hostname(host->mmc),
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host->max_delay);
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@@ -751,6 +760,11 @@ void bcm2835_sdhost_send_command(struct
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host->cmd = cmd;
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+ /* Clear any error flags */
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+ sdhsts = bcm2835_sdhost_read(host, SDHSTS);
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+ if (sdhsts & SDHSTS_ERROR_MASK)
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+ bcm2835_sdhost_write(host, sdhsts, SDHSTS);
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+
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bcm2835_sdhost_prepare_data(host, cmd);
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bcm2835_sdhost_write(host, cmd->arg, SDARG);
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@@ -876,7 +890,7 @@ static void bcm2835_sdhost_transfer_comp
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static void bcm2835_sdhost_finish_command(struct bcm2835_host *host)
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{
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u32 sdcmd;
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- int timeout = 1000;
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+ unsigned long timeout;
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#ifdef DEBUG
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struct timeval before, after;
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int timediff = 0;
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@@ -889,6 +903,8 @@ static void bcm2835_sdhost_finish_comman
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#ifdef DEBUG
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do_gettimeofday(&before);
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#endif
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+ /* Wait max 100 ms */
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+ timeout = 10000;
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for (sdcmd = bcm2835_sdhost_read(host, SDCMD);
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(sdcmd & SDCMD_NEW_FLAG) && timeout;
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timeout--) {
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@@ -1049,9 +1065,9 @@ static void bcm2835_sdhost_pio_timeout(u
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spin_lock_irqsave(&host->lock, flags);
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if (host->data) {
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- u32 hsts = bcm2835_sdhost_read(host, SDHSTS);
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+ u32 sdhsts = bcm2835_sdhost_read(host, SDHSTS);
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- if (hsts & SDHSTS_REW_TIME_OUT) {
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+ if (sdhsts & SDHSTS_REW_TIME_OUT) {
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pr_err("%s: transfer timeout\n",
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mmc_hostname(host->mmc));
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if (host->debug)
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@@ -1380,19 +1396,10 @@ void bcm2835_sdhost_set_clock(struct bcm
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if (host->debug)
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pr_info("%s: set_clock(%d)\n", mmc_hostname(host->mmc), clock);
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- if ((clock == 0) && host->reduce_overclock) {
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- /* This is a reset following data corruption - reduce any
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- overclock */
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- host->reduce_overclock = 0;
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- if (host->overclock_50 > 50) {
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- pr_warn("%s: reducing overclock due to errors\n",
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- mmc_hostname(host->mmc));
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- host->overclock_50--;
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- }
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- }
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-
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- if (host->overclock_50 && (clock == 50*MHZ))
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+ if ((host->overclock_50 > 50) &&
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+ (clock == 50*MHZ)) {
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clock = host->overclock_50 * MHZ + (MHZ - 1);
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+ }
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/* The SDCDIV register has 11 bits, and holds (div - 2).
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But in data mode the max is 50MHz wihout a minimum, and only the
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@@ -1450,11 +1457,12 @@ void bcm2835_sdhost_set_clock(struct bcm
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host->overclock = clock;
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}
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}
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- else if ((clock == 50 * MHZ) && host->overclock)
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+ else if (host->overclock)
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{
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- pr_warn("%s: cancelling overclock\n",
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- mmc_hostname(host->mmc));
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host->overclock = 0;
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+ if (clock == 50 * MHZ)
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+ pr_warn("%s: cancelling overclock\n",
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+ mmc_hostname(host->mmc));
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}
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host->cdiv = div;
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@@ -1492,6 +1500,14 @@ static void bcm2835_sdhost_request(struc
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cmd->opcode, cmd->arg, cmd->flags);
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}
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+ /* Reset the error statuses in case this is a retry */
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+ if (mrq->cmd)
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+ mrq->cmd->error = 0;
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+ if (mrq->data)
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+ mrq->data->error = 0;
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+ if (mrq->stop)
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+ mrq->stop->error = 0;
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+
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if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
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pr_err("%s: unsupported block size (%d bytes)\n",
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mmc_hostname(mmc), mrq->data->blksz);
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@@ -1613,21 +1629,16 @@ static void bcm2835_sdhost_tasklet_finis
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/* Drop the overclock after any data corruption, or after any
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error overclocked */
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- if (mrq->data && (mrq->data->error == -EILSEQ))
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- host->reduce_overclock = 1;
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- else if (host->overclock) {
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- /* Convert timeout errors while overclocked to data errors,
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- because the system recovers better. */
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- if (mrq->cmd && mrq->cmd->error) {
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- host->reduce_overclock = 1;
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- if (mrq->cmd->error == -ETIMEDOUT)
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- mrq->cmd->error = -EILSEQ;
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- }
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-
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- if (mrq->data && mrq->data->error) {
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- host->reduce_overclock = 1;
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- if (mrq->data->error == -ETIMEDOUT)
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- mrq->data->error = -EILSEQ;
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+ if (host->overclock) {
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+ if ((mrq->cmd && mrq->cmd->error) ||
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+ (mrq->data && mrq->data->error) ||
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+ (mrq->stop && mrq->stop->error)) {
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+ host->overclock_50--;
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+ pr_warn("%s: reducing overclock due to errors\n",
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+ mmc_hostname(host->mmc));
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+ bcm2835_sdhost_set_clock(host,50*MHZ);
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+ mrq->cmd->error = -EILSEQ;
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+ mrq->cmd->retries = 1;
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}
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}
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@@ -1769,6 +1780,7 @@ static int bcm2835_sdhost_probe(struct p
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host = mmc_priv(mmc);
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host->mmc = mmc;
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host->pio_timeout = msecs_to_jiffies(500);
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+ host->max_delay = 1; /* Warn if over 1ms */
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spin_lock_init(&host->lock);
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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