diff options
Diffstat (limited to 'target/linux/goldfish/patches-2.6.30/0094-mmc-sd-Add-new-CONFIG_MMC_PARANOID_SD_INIT-for-ena.patch')
| -rw-r--r-- | target/linux/goldfish/patches-2.6.30/0094-mmc-sd-Add-new-CONFIG_MMC_PARANOID_SD_INIT-for-ena.patch | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/target/linux/goldfish/patches-2.6.30/0094-mmc-sd-Add-new-CONFIG_MMC_PARANOID_SD_INIT-for-ena.patch b/target/linux/goldfish/patches-2.6.30/0094-mmc-sd-Add-new-CONFIG_MMC_PARANOID_SD_INIT-for-ena.patch new file mode 100644 index 000000000..275504b35 --- /dev/null +++ b/target/linux/goldfish/patches-2.6.30/0094-mmc-sd-Add-new-CONFIG_MMC_PARANOID_SD_INIT-for-ena.patch @@ -0,0 +1,69 @@ +From 66983857a54479d76ce6dbd8399e1276698bd3c5 Mon Sep 17 00:00:00 2001 +From: San Mehat <san@google.com> +Date: Tue, 11 Nov 2008 09:35:36 -0800 +Subject: [PATCH 094/134] mmc: sd: Add new CONFIG_MMC_PARANOID_SD_INIT for enabling retries during SD detection + +Signed-off-by: San Mehat <san@google.com> +--- + drivers/mmc/core/Kconfig | 8 ++++++++ + drivers/mmc/core/sd.c | 24 ++++++++++++++++++++++-- + 2 files changed, 30 insertions(+), 2 deletions(-) + +--- a/drivers/mmc/core/Kconfig ++++ b/drivers/mmc/core/Kconfig +@@ -14,3 +14,11 @@ config MMC_UNSAFE_RESUME + This option is usually just for embedded systems which use + a MMC/SD card for rootfs. Most people should say N here. + ++config MMC_PARANOID_SD_INIT ++ bool "Enable paranoid SD card initialization (EXPERIMENTAL)" ++ help ++ If you say Y here, the MMC layer will be extra paranoid ++ about re-trying SD init requests. This can be a useful ++ work-around for buggy controllers and hardware. Enable ++ if you are experiencing issues with SD detection. ++ +--- a/drivers/mmc/core/sd.c ++++ b/drivers/mmc/core/sd.c +@@ -336,7 +336,9 @@ static int mmc_sd_init_card(struct mmc_h + int err; + u32 cid[4]; + unsigned int max_dtr; +- ++#ifdef CONFIG_MMC_PARANOID_SD_INIT ++ int retries; ++#endif + BUG_ON(!host); + WARN_ON(!host->claimed); + +@@ -439,11 +441,29 @@ static int mmc_sd_init_card(struct mmc_h + err = mmc_decode_scr(card); + if (err < 0) + goto free_card; +- + /* + * Fetch switch information from card. + */ ++#ifdef CONFIG_MMC_PARANOID_SD_INIT ++ for (retries = 1; retries <= 3; retries++) { ++ err = mmc_read_switch(card); ++ if (!err) { ++ if (retries > 1) { ++ printk(KERN_WARNING ++ "%s: recovered\n", ++ mmc_hostname(host)); ++ } ++ break; ++ } else { ++ printk(KERN_WARNING ++ "%s: read switch failed (attempt %d)\n", ++ mmc_hostname(host), retries); ++ } ++ } ++#else + err = mmc_read_switch(card); ++#endif ++ + if (err) + goto free_card; + } |