pxa2xx_spi: restore DRCMR on resume

If DMA is enabled, any spi_sync call after suspend/resume would block
forever, because DRCMR is lost on suspend.  This patch restores DRCMR to
the same values set by probe.

Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index c76feea..1a00b41 100644 (file)
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -1700,6 +1700,13 @@ static int pxa2xx_spi_resume(struct platform_device *pdev)
        struct ssp_device *ssp = drv_data->ssp;
        int status = 0;
 
+       if (drv_data->rx_channel != -1)
+               DRCMR(drv_data->ssp->drcmr_rx) =
+                       DRCMR_MAPVLD | drv_data->rx_channel;
+       if (drv_data->tx_channel != -1)
+               DRCMR(drv_data->ssp->drcmr_tx) =
+                       DRCMR_MAPVLD | drv_data->tx_channel;
+
        /* Enable the SSP clock */
        clk_enable(ssp->clk);