diff options
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.24/1323-GTA01-use-slow-SD-clock-when-gps-on.patch.patch')
| -rw-r--r-- | target/linux/s3c24xx/patches-2.6.24/1323-GTA01-use-slow-SD-clock-when-gps-on.patch.patch | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.24/1323-GTA01-use-slow-SD-clock-when-gps-on.patch.patch b/target/linux/s3c24xx/patches-2.6.24/1323-GTA01-use-slow-SD-clock-when-gps-on.patch.patch deleted file mode 100644 index 3e16c6edfe..0000000000 --- a/target/linux/s3c24xx/patches-2.6.24/1323-GTA01-use-slow-SD-clock-when-gps-on.patch.patch +++ /dev/null @@ -1,161 +0,0 @@ -From d944934bbddc281938fb1905a69e35c0581937c2 Mon Sep 17 00:00:00 2001 -From: Mike Westerhof <mwester@dls.net> -Date: Thu, 13 Nov 2008 20:39:36 +0000 -Subject: [PATCH] GTA01-use-slow-SD-clock-when-gps-on.patch - -This patch implements Andy Green's SD clock slow-down code -for the GTA01 device. - -Signed-off-by: Mike Westerhof <mwester@dls.net> ---- - arch/arm/mach-s3c2410/mach-gta01.c | 8 ++++++ - drivers/mmc/host/s3cmci.c | 43 ++++++++++++++++++++++++++++++++++- - drivers/mmc/host/s3cmci.h | 1 + - include/asm-arm/arch-s3c2410/mci.h | 1 + - 4 files changed, 51 insertions(+), 2 deletions(-) - -diff --git a/arch/arm/mach-s3c2410/mach-gta01.c b/arch/arm/mach-s3c2410/mach-gta01.c -index a364b76..c0817dc 100644 ---- a/arch/arm/mach-s3c2410/mach-gta01.c -+++ b/arch/arm/mach-s3c2410/mach-gta01.c -@@ -75,6 +75,8 @@ - #include <asm/plat-s3c24xx/neo1973.h> - #include <asm/arch-s3c2410/neo1973-pm-gsm.h> - -+#include "../plat-s3c24xx/neo1973_pm_gps.h" -+ - #include <linux/jbt6k74.h> - - static struct map_desc gta01_iodesc[] __initdata = { -@@ -432,9 +434,15 @@ static void gta01_mmc_set_power(unsigned char power_mode, unsigned short vdd) - } - } - -+static int gta01_mmc_use_slow(void) -+{ -+ return neo1973_pm_gps_is_on(); -+} -+ - static struct s3c24xx_mci_pdata gta01_mmc_cfg = { - .gpio_detect = GTA01_GPIO_nSD_DETECT, - .set_power = >a01_mmc_set_power, -+ .use_slow = >a01_mmc_use_slow, - .ocr_avail = MMC_VDD_165_195|MMC_VDD_20_21| - MMC_VDD_21_22|MMC_VDD_22_23|MMC_VDD_23_24| - MMC_VDD_24_25|MMC_VDD_25_26|MMC_VDD_26_27| -diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c -index 8f88721..87d24b2 100644 ---- a/drivers/mmc/host/s3cmci.c -+++ b/drivers/mmc/host/s3cmci.c -@@ -59,6 +59,23 @@ module_param(sd_max_clk, int, 0644); - static int sd_idleclk; /* disallow idle clock by default */ - module_param(sd_idleclk, int, 0644); - -+/* -+ * Slow SD clock rate -+ * -+ * you can override this on kernel commandline using -+ * -+ * s3cmci.sd_slow_ratio=8 -+ * -+ * for example. -+ * -+ * A platform callback is used to decide effective clock rate. If not -+ * defined, then the max is used, if defined and the callback returns -+ * nonzero, the rate is divided by this factor. -+ */ -+ -+static int sd_slow_ratio = 8; -+module_param(sd_slow_ratio, int, 0644); -+ - /* used to stash real idleclk state in suspend: we force it to run in there */ - static int suspend_sd_idleclk; - -@@ -252,7 +269,7 @@ static inline void do_pio_read(struct s3cmci_host *host) - void __iomem *from_ptr; - - /* write real prescaler to host, it might be set slow to fix */ -- writel(host->prescaler, host->base + S3C2410_SDIPRE); -+ writel(host->sdipre, host->base + S3C2410_SDIPRE); - - from_ptr = host->base + host->sdidata; - -@@ -755,7 +772,7 @@ static void finalize_request(struct s3cmci_host *host) - cmd->resp[3] = readl(host->base + S3C2410_SDIRSP3); - - /* reset clock speed, as it could still be set low for */ -- writel(host->prescaler, host->base + S3C2410_SDIPRE); -+ writel(host->sdipre, host->base + S3C2410_SDIPRE); - - if (cmd->error) - debug_as_failure = 1; -@@ -1032,6 +1049,7 @@ static void s3cmci_send_request(struct mmc_host *mmc) - struct s3cmci_host *host = mmc_priv(mmc); - struct mmc_request *mrq = host->mrq; - struct mmc_command *cmd = host->cmd_is_stop?mrq->stop:mrq->cmd; -+ int pre; - - host->ccnt++; - #ifdef CONFIG_MMC_DEBUG -@@ -1073,6 +1091,26 @@ static void s3cmci_send_request(struct mmc_host *mmc) - - } - -+ /* establish the correct prescaler depending on the sd_slow_ratio */ -+ -+ if ((sd_slow_ratio > 1) && -+ host->pdata->use_slow && (host->pdata->use_slow)()) { -+ /* compute the slower speed */ -+ pre = host->prescaler * sd_slow_ratio; -+ if (pre > 255) -+ pre = 255; -+ } else { -+ /* use the normal speed */ -+ pre = host->prescaler; -+ } -+ -+ if (host->sdipre != pre) { -+ dbg(host, dbg_conf, "prescaler changed: %d -> %d\n", -+ (int)host->sdipre, pre); -+ host->sdipre = pre; -+ writel(host->sdipre, host->base + S3C2410_SDIPRE); -+ } -+ - __s3cmci_enable_clock(host); - s3cmci_send_command(host, cmd); - enable_irq(host->irq); -@@ -1138,6 +1176,7 @@ static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) - if (mci_psc > 255) - mci_psc = 255; - host->prescaler = mci_psc; -+ host->sdipre = mci_psc; - - writel(host->prescaler, host->base + S3C2410_SDIPRE); - -diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h -index 9644b45..11974ff 100644 ---- a/drivers/mmc/host/s3cmci.h -+++ b/drivers/mmc/host/s3cmci.h -@@ -32,6 +32,7 @@ struct s3cmci_host { - unsigned long clk_div; - unsigned long real_rate; - u8 prescaler; -+ u8 sdipre; - - int is2440; - unsigned sdiimsk; -diff --git a/include/asm-arm/arch-s3c2410/mci.h b/include/asm-arm/arch-s3c2410/mci.h -index 24e6cd1..f087229 100644 ---- a/include/asm-arm/arch-s3c2410/mci.h -+++ b/include/asm-arm/arch-s3c2410/mci.h -@@ -8,6 +8,7 @@ struct s3c24xx_mci_pdata { - unsigned int do_dma; - void (*set_power)(unsigned char power_mode, - unsigned short vdd); -+ int (*use_slow)(void); - }; - - #endif /* _ARCH_NCI_H */ --- -1.5.6.5 - |