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Subject[PATCH] mmc fix for clock-off PXA255/270
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It solves the problems with clock-off in the PXA255/270 MMC/SD hardware.
This solution was testes with our devices and works good.
Kernel 2.6.24.4 (but should work with >=2.6.19).diff -NuarBb /x/work/navi_os/mmc/host/pxamci.c mmc/host/pxamci.c
--- /x/work/navi_os/mmc/host/pxamci.c 2008-03-24 19:49:18.000000000 +0100
+++ mmc/host/pxamci.c 2008-04-25 12:14:00.000000000 +0200
@@ -26,6 +26,7 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>

#include <asm/dma.h>
#include <asm/io.h>
@@ -67,6 +68,8 @@
unsigned int dma_dir;
};

+static int local_cmd = -1;
+
static void pxamci_stop_clock(struct pxamci_host *host)
{
if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
@@ -84,6 +87,7 @@

if (v & STAT_CLK_EN)
dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
+ local_cmd = -1;
}
}

@@ -232,6 +235,14 @@
v = w2;
}

+ local_cmd = cmd->opcode;
+ if ((local_cmd == MMC_GO_IDLE_STATE) ||
+ (local_cmd == MMC_GO_INACTIVE_STATE) ||
+ (local_cmd == MMC_SEND_STATUS) ||
+ (local_cmd == MMC_STOP_TRANSMISSION) ||
+ (local_cmd == MMC_SET_BLOCKLEN)
+ ) pxamci_stop_clock(host);
+
if (stat & STAT_TIME_OUT_RESPONSE) {
cmd->error = -ETIMEDOUT;
} else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
@@ -290,7 +301,7 @@

host->data = NULL;
if (host->mrq->stop) {
- pxamci_stop_clock(host);
+ //pxamci_stop_clock(host);
pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
} else {
pxamci_finish_request(host, host->mrq);
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