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59 lines
2.1 KiB
Diff
59 lines
2.1 KiB
Diff
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From 1d40ccabc74877cc47fa91490b772e9611215b39 Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Fri, 25 Jul 2008 23:06:21 +0100
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Subject: [PATCH] fix-glamo-mci-possible-timeout-overflow.patch
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The MMC stack hands us a timeout calibrated in SD_CLK clocks, but the
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Glamo can only deal with up to 65520 clocks of timeout. If the stack
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handed us a request bigger than this, it would just wrap and the
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timeout we actually used would be way too short.
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With this patch if that happens, we use the longest timeout we can,
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65520 clocks and give it our best shot.
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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drivers/mfd/glamo/glamo-mci.c | 19 ++++++++++---------
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1 files changed, 10 insertions(+), 9 deletions(-)
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diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
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index 0374446..505be5f 100644
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--- a/drivers/mfd/glamo/glamo-mci.c
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+++ b/drivers/mfd/glamo/glamo-mci.c
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@@ -338,6 +338,7 @@ static int glamo_mci_send_command(struct glamo_mci_host *host,
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{
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u8 u8a[6];
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u16 fire = 0;
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+ u16 timeout = 0xfff; /* max glamo MMC timeout, in units of 16 clocks */
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/* if we can't do it, reject as busy */
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if (!readw_dly(host->base + GLAMO_REG_MMC_RB_STAT1) &
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@@ -447,15 +448,15 @@ static int glamo_mci_send_command(struct glamo_mci_host *host,
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fire |= GLAMO_FIRE_MMC_CC_BASIC; /* "basic command" */
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break;
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}
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- /* enforce timeout */
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- if (cmd->data) {
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- if (cmd->data->timeout_clks)
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- writew_dly(cmd->data->timeout_clks >> 4, /* / 16 clks */
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- host->base + GLAMO_REG_MMC_TIMEOUT);
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- else
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- writew_dly(0xfff, host->base + GLAMO_REG_MMC_TIMEOUT);
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- } else
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- writew(0xfff, host->base + GLAMO_REG_MMC_TIMEOUT);
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+ /* enforce timeout, clipping at default 65520 clocks if larger */
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+ if (cmd->data)
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+ /* so long as there is one... */
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+ if (cmd->data->timeout_clks &&
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+ /* ... and it is not longer than we can handle */
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+ (cmd->data->timeout_clks <= 0xffff))
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+ timeout = cmd->data->timeout_clks >> 4; /* / 16 clks */
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+
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+ writew(timeout, host->base + GLAMO_REG_MMC_TIMEOUT);
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/* Generate interrupt on txfer */
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writew_dly((readw_dly(host->base + GLAMO_REG_MMC_BASIC) & 0x3e) |
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--
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1.5.6.3
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