diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0185-bcm2835-sdhost-Workaround-for-slow-sectors.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0185-bcm2835-sdhost-Workaround-for-slow-sectors.patch | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0185-bcm2835-sdhost-Workaround-for-slow-sectors.patch b/target/linux/brcm2708/patches-4.4/0185-bcm2835-sdhost-Workaround-for-slow-sectors.patch deleted file mode 100644 index 81abccd11b..0000000000 --- a/target/linux/brcm2708/patches-4.4/0185-bcm2835-sdhost-Workaround-for-slow-sectors.patch +++ /dev/null @@ -1,118 +0,0 @@ -From d8b46a34e59ebee9ffa01a4b5bbe407351dff12d Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Tue, 15 Mar 2016 14:10:29 +0000 -Subject: [PATCH] bcm2835-sdhost: Workaround for "slow" sectors - -Some cards have been seen to cause timeouts after certain sectors are -read. This workaround enforces a minimum delay between the stop after -reading one of those sectors and a subsequent data command. - -Using CMD23 (SET_BLOCK_COUNT) avoids this problem, so good cards will -not be penalised by this workaround. - -Signed-off-by: Phil Elwell <phil@raspberrypi.org> ---- - drivers/mmc/host/bcm2835-sdhost.c | 50 +++++++++++++++++++++++++++++++++++---- - 1 file changed, 46 insertions(+), 4 deletions(-) - ---- a/drivers/mmc/host/bcm2835-sdhost.c -+++ b/drivers/mmc/host/bcm2835-sdhost.c -@@ -202,9 +202,12 @@ struct bcm2835_host { - int max_delay; /* maximum length of time spent waiting */ - struct timeval stop_time; /* when the last stop was issued */ - u32 delay_after_stop; /* minimum time between stop and subsequent data transfer */ -+ u32 delay_after_this_stop; /* minimum time between this stop and subsequent data transfer */ - u32 overclock_50; /* frequency to use when 50MHz is requested (in MHz) */ - u32 overclock; /* Current frequency if overclocked, else zero */ - u32 pio_limit; /* Maximum block count for PIO (0 = always DMA) */ -+ -+ u32 sectors; /* Cached card size in sectors */ - }; - - #if ENABLE_LOG -@@ -425,6 +428,7 @@ static void bcm2835_sdhost_reset_interna - bcm2835_sdhost_set_power(host, true); - mdelay(10); - host->clock = 0; -+ host->sectors = 0; - bcm2835_sdhost_write(host, host->hcfg, SDHCFG); - bcm2835_sdhost_write(host, host->cdiv, SDCDIV); - mmiowb(); -@@ -880,6 +884,24 @@ static void bcm2835_sdhost_prepare_data( - host->flush_fifo = 0; - host->data->bytes_xfered = 0; - -+ if (!host->sectors && host->mmc->card) { -+ struct mmc_card *card = host->mmc->card; -+ if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { -+ /* -+ * The EXT_CSD sector count is in number of 512 byte -+ * sectors. -+ */ -+ host->sectors = card->ext_csd.sectors; -+ } else { -+ /* -+ * The CSD capacity field is in units of read_blkbits. -+ * set_capacity takes units of 512 bytes. -+ */ -+ host->sectors = card->csd.capacity << -+ (card->csd.read_blkbits - 9); -+ } -+ } -+ - if (!host->dma_desc) { - /* Use PIO */ - int flags = SG_MITER_ATOMIC; -@@ -989,7 +1011,7 @@ bool bcm2835_sdhost_send_command(struct - - if (cmd->data) { - log_event("CMDD", cmd->data->blocks, cmd->data->blksz); -- if (host->delay_after_stop) { -+ if (host->delay_after_this_stop) { - struct timeval now; - int time_since_stop; - do_gettimeofday(&now); -@@ -998,12 +1020,32 @@ bool bcm2835_sdhost_send_command(struct - /* Possibly less than one second */ - time_since_stop = time_since_stop * 1000000 + - (now.tv_usec - host->stop_time.tv_usec); -- if (time_since_stop < host->delay_after_stop) -- udelay(host->delay_after_stop - -+ if (time_since_stop < -+ host->delay_after_this_stop) -+ udelay(host->delay_after_this_stop - - time_since_stop); - } - } - -+ host->delay_after_this_stop = host->delay_after_stop; -+ if ((cmd->data->flags & MMC_DATA_READ) && !host->use_sbc) { -+ /* See if read crosses one of the hazardous sectors */ -+ u32 first_blk, last_blk; -+ -+ /* Intentionally include the following sector because -+ without CMD23/SBC the read may run on. */ -+ first_blk = host->mrq->cmd->arg; -+ last_blk = first_blk + cmd->data->blocks; -+ -+ if (((last_blk >= (host->sectors - 64)) && -+ (first_blk <= (host->sectors - 64))) || -+ ((last_blk >= (host->sectors - 32)) && -+ (first_blk <= (host->sectors - 32)))) { -+ host->delay_after_this_stop = -+ max(250u, host->delay_after_stop); -+ } -+ } -+ - if (cmd->data->flags & MMC_DATA_WRITE) - sdcmd |= SDCMD_WRITE_CMD; - if (cmd->data->flags & MMC_DATA_READ) -@@ -1078,7 +1120,7 @@ static void bcm2835_sdhost_transfer_comp - if (!host->use_busy) - bcm2835_sdhost_finish_command(host, NULL); - -- if (host->delay_after_stop) -+ if (host->delay_after_this_stop) - do_gettimeofday(&host->stop_time); - } - } else { |