disable IMQ on 2.6.28 as well -- people should use IFB..
[openwrt.git] / target / linux / s3c24xx / patches / 0224-fix-glamo-mci-ensure-more-than-74-clocks-after-power.patch
1 From 2e9349e8be6002955cb0ab6a6ed536f5f8041cba Mon Sep 17 00:00:00 2001
2 From: Andy Green <andy@openmoko.com>
3 Date: Fri, 25 Jul 2008 23:06:21 +0100
4 Subject: [PATCH] fix-glamo-mci-ensure-more-than-74-clocks-after-power.patch
5
6 We are meant to run SD_CLK a little while after power-on for the SD
7 Card, but with the no idle clock changes we didn't take care about it.
8
9 This makes us sleep a little bit before disabling clock if we just
10 powered up the SD Card.
11
12 Signed-off-by: Andy Green <andy@openmoko.com>
13 ---
14  drivers/mfd/glamo/glamo-mci.c |    8 ++++++++
15  1 files changed, 8 insertions(+), 0 deletions(-)
16
17 diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
18 index 505be5f..0d82955 100644
19 --- a/drivers/mfd/glamo/glamo-mci.c
20 +++ b/drivers/mfd/glamo/glamo-mci.c
21 @@ -684,6 +684,7 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
22         struct glamo_mci_host *host = mmc_priv(mmc);
23         int n = 0;
24         int div;
25 +       int powering = 0;
26  
27         /* Set power */
28         switch(ios->power_mode) {
29 @@ -699,6 +700,7 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
30                 glamo_engine_enable(glamo_mci_def_pdata.pglamo,
31                                                         GLAMO_ENGINE_MMC);
32                 glamo_mci_reset(host);
33 +               powering = 1;
34                 break;
35  
36         case MMC_POWER_OFF:
37 @@ -716,6 +718,12 @@ static void glamo_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
38         host->real_rate = __glamo_mci_set_card_clock(host, ios->clock, &div);
39         host->clk_div = div;
40  
41 +       /* after power-up, we are meant to give it >= 74 clocks so it can
42 +        * initialize itself.  Doubt any modern cards need it but anyway...
43 +        */
44 +       if (powering)
45 +               msleep(1);
46 +
47         if (!sd_idleclk)
48                 /* stop the clock to card, because we are idle until transfer */
49                 __glamo_mci_fix_card_div(host, -1);
50 -- 
51 1.5.6.3
52