[patch 072/232] omap_hsmmc: set a large data timeout for commands with busy signal

[patch 072/232] omap_hsmmc: set a large data timeout for commands with busy signal

[akpm]

From: Adrian Hunter <adrian.hunter@nokia.com>

Commands like SWITCH (CMD6) send a response and then signal busy while the
operation is completed.  These commands are expected to always succeed
(otherwise the response would have indicated an error).

Set an arbitrarily large data timeout value (100ms) for these commands to
ensure that premature timeouts do not occur.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Cc: Denis Karpov <ext-denis.2.karpov@nokia.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Philip Langdale <philipl@overt.org>
Cc: "Madhusudhan" <madhu.cr@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/mmc/host/omap_hsmmc.c |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff -puN drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-set-a-large-data-timeout-for-commands-with-busy-signal drivers/mmc/host/omap_hsmmc.c
--- a/drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-set-a-large-data-timeout-for-commands-with-busy-signal
+++ a/drivers/mmc/host/omap_hsmmc.c
@@ -997,7 +997,8 @@ static int omap_hsmmc_start_dma_transfer
 }
 
 static void set_data_timeout(struct omap_hsmmc_host *host,
-			     struct mmc_request *req)
+			     unsigned int timeout_ns,
+			     unsigned int timeout_clks)
 {
 	unsigned int timeout, cycle_ns;
 	uint32_t reg, clkd, dto = 0;
@@ -1008,8 +1009,8 @@ static void set_data_timeout(struct omap
 		clkd = 1;
 
 	cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
-	timeout = req->data->timeout_ns / cycle_ns;
-	timeout += req->data->timeout_clks;
+	timeout = timeout_ns / cycle_ns;
+	timeout += timeout_clks;
 	if (timeout) {
 		while ((timeout & 0x80000000) == 0) {
 			dto += 1;
@@ -1043,12 +1044,18 @@ omap_hsmmc_prepare_data(struct omap_hsmm
 
 	if (req->data == NULL) {
 		OMAP_HSMMC_WRITE(host->base, BLK, 0);
+		/*
+		 * Set an arbitrary 100ms data timeout for commands with
+		 * busy signal.
+		 */
+		if (req->cmd->flags & MMC_RSP_BUSY)
+			set_data_timeout(host, 100000000U, 0);
 		return 0;
 	}
 
 	OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
 					| (req->data->blocks << 16));
-	set_data_timeout(host, req);
+	set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
 
 	if (host->use_dma) {
 		ret = omap_hsmmc_start_dma_transfer(host, req);
_