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87 lines
2.5 KiB
Diff
87 lines
2.5 KiB
Diff
From 8a7013f47196abed7e6a40e93d1de1639cd46228 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Fri, 10 Jul 2015 17:03:03 +0200
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Subject: [PATCH] mmc: sunxi: Don't start commands while the card is busy
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Some sdio wifi modules have not been working reliable with the sunxi-mmc
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host code. This turns out to be caused by it starting new commands while
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the card signals that it is still busy processing a previous command.
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This commit fixes this, thereby fixing the wifi reliability issues on
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the Cubietruck and other sunxi boards using sdio wifi.
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Reported-by: Eugene K <sigintmailru@gmail.com>
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Suggested-by: Eugene K <sigintmailru@gmail.com>
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Cc: Eugene K <sigintmailru@gmail.com>
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Cc: Arend van Spriel <arend@broadcom.com>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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Changes in v2:
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-Properly accredit Eugene K for coming up with the fix for this
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---
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drivers/mmc/host/sunxi-mmc.c | 32 ++++++++++++++++++++++++++++++++
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1 file changed, 32 insertions(+)
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--- a/drivers/mmc/host/sunxi-mmc.c
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+++ b/drivers/mmc/host/sunxi-mmc.c
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@@ -289,6 +289,24 @@ static int sunxi_mmc_init_host(struct mm
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return 0;
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}
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+/* Wait for card to report ready before starting a new cmd */
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+static int sunxi_mmc_wait_card_ready(struct sunxi_mmc_host *host)
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+{
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+ unsigned long expire = jiffies + msecs_to_jiffies(500);
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+ u32 rval;
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+
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+ do {
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+ rval = mmc_readl(host, REG_STAS);
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+ } while (time_before(jiffies, expire) && (rval & SDXC_CARD_DATA_BUSY));
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+
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+ if (rval & SDXC_CARD_DATA_BUSY) {
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+ dev_err(mmc_dev(host->mmc), "Error R1 ready timeout\n");
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+ return -EIO;
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+ }
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+
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+ return 0;
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+}
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+
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static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
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struct mmc_data *data)
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{
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@@ -383,6 +401,8 @@ static void sunxi_mmc_send_manual_stop(s
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u32 arg, cmd_val, ri;
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unsigned long expire = jiffies + msecs_to_jiffies(1000);
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+ sunxi_mmc_wait_card_ready(host);
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+
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cmd_val = SDXC_START | SDXC_RESP_EXPIRE |
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SDXC_STOP_ABORT_CMD | SDXC_CHECK_RESPONSE_CRC;
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@@ -597,6 +617,11 @@ static int sunxi_mmc_oclk_onoff(struct s
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{
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unsigned long expire = jiffies + msecs_to_jiffies(250);
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u32 rval;
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+ int ret;
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+
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+ ret = sunxi_mmc_wait_card_ready(host);
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+ if (ret)
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+ return ret;
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rval = mmc_readl(host, REG_CLKCR);
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rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON);
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@@ -784,6 +809,13 @@ static void sunxi_mmc_request(struct mmc
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mmc_request_done(mmc, mrq);
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return;
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}
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+
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+ ret = sunxi_mmc_wait_card_ready(host);
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+ if (ret) {
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+ mrq->cmd->error = ret;
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+ mmc_request_done(mmc, mrq);
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+ return;
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+ }
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if (data) {
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ret = sunxi_mmc_map_dma(host, data);
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