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Subject[PATCH] add Marvell 88W8688 support to libertas_sdio
Date
This chip is for example used in the GuruPlug.
This patch avoids the following error:
libertas_sdio: failed to load firmware
libertas_sdio: probe of mmc0:0001:1 failed with error -5

The fix is based on code in:
drivers/net/wireless/libertas_uap/uap_sdio_mmc.c

This file can for example be found on the following links:
http://www.xilka.com/sheeva/2.6/2.6.36/2.6.36.2/source/0002-Driver-for-Marvell-Libertas-8688-SDIO-micro-AP-suppo-2.6.35.patch
http://www.downloadsnewit.co.uk/kernel-v3.0.7/

I followed the following wiki to setup a working WiFi client mode
connection on the GuruPlug:
http://wiki.debian.org/libertas

Signed-off-by: Harro Haan <hrhaan@gmail.com>
---
drivers/net/wireless/libertas/if_sdio.c | 39 ++++++++++++++++++++++++--------
1 file changed, 30 insertions(+), 9 deletions(-)

Index: linux.git/drivers/net/wireless/libertas/if_sdio.c
===================================================================
--- linux.git.orig/drivers/net/wireless/libertas/if_sdio.c
+++ linux.git/drivers/net/wireless/libertas/if_sdio.c
@@ -588,17 +588,38 @@ static int if_sdio_prog_real(struct if_s
size = fw->size;

while (size) {
- ret = if_sdio_wait_status(card, FW_DL_READY_STATUS);
- if (ret)
- goto release;
+ timeout = jiffies + HZ;
+ while (1) {
+ ret = if_sdio_wait_status(card, FW_DL_READY_STATUS);
+ if (ret)
+ goto release;

- req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
- if (ret)
- goto release;
+ req_size = sdio_readb(card->func, IF_SDIO_RD_BASE,
+ &ret);
+ if (ret)
+ goto release;
+
+ req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1,
+ &ret) << 8;
+ if (ret)
+ goto release;
+
+ /*
+ * For SD8688 wait until the length is not 0, 1 or 2
+ * before downloading the first FW block,
+ * since BOOT code writes the register to indicate the
+ * helper/FW download winner,
+ * the value could be 1 or 2 (Func1 or Func2).
+ */
+ if ((size != fw->size) || (req_size > 2))
+ break;
+ if (time_after(jiffies, timeout)) {
+ ret = -ETIMEDOUT;
+ goto release;
+ }
+ mdelay(1);
+ }

- req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
- if (ret)
- goto release;
/*
lbs_deb_sdio("firmware wants %d bytes\n", (int)req_size);
*/

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