Make Chumby work again with its SD card

Make Chumby work again with its SD card

[Juergen Beisert]

Due to a missing resource size the Chumby isn't able to work with its SD card
anymore. Instead it hangs forever. By using the generic block reset routine I
was able to discover the cause. The following two patches makes the Chumby
work again. At least the resource size patch should be applied to the current
master.

jbe


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[PATCH 1/2] MXS/Chumby: fix MCI device registration

[Juergen Beisert]

Due to some changes in the framework a resource size of zero does not map
anything at all and it does it silently.

Defining the resource size for the MCI interface make it work again on the
Chumby.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 arch/arm/boards/chumby_falconwing/falconwing.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boards/chumby_falconwing/falconwing.c b/arch/arm/boards/chumby_falconwing/falconwing.c
index fd5bc4c..720fe32 100644
--- a/arch/arm/boards/chumby_falconwing/falconwing.c
+++ b/arch/arm/boards/chumby_falconwing/falconwing.c
@@ -293,7 +293,7 @@ static int falconwing_devices_init(void)
 	imx_set_ioclk(480000000); /* enable IOCLK to run at the PLL frequency */
 	/* run the SSP unit clock at 100,000 kHz */
 	imx_set_sspclk(0, 100000000, 1);
-	add_generic_device("mxs_mci", 0, NULL, IMX_SSP1_BASE, 0,
+	add_generic_device("mxs_mci", 0, NULL, IMX_SSP1_BASE, 0x2000,
 			   IORESOURCE_MEM, &mci_pdata);
 	add_generic_device("stmfb", 0, NULL, IMX_FB_BASE, 4096,
 			   IORESOURCE_MEM, &fb_mode);
-- 
1.8.2.rc2


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[PATCH 2/2] MXS/MCI: simplify reset of the MCI device block

[Juergen Beisert]

Since a generic block reset function is a available, also the MCI driver
should make use of it.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 drivers/mci/mxs.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/drivers/mci/mxs.c b/drivers/mci/mxs.c
index 3657b3e..93f5a41 100644
--- a/drivers/mci/mxs.c
+++ b/drivers/mci/mxs.c
@@ -446,19 +446,6 @@ static unsigned mxs_mci_setup_clock_speed(struct mxs_mci_host *mxs_mci, unsigned
 	return ssp / div / rate;
 }
 
-/**
- * Reset the MCI engine (the hard way)
- * @param hw_dev Host interface instance
- *
- * This will reset everything in all registers of this unit! (FIXME)
- */
-static void mxs_mci_reset(struct mxs_mci_host *mxs_mci)
-{
-	writel(SSP_CTRL0_SFTRST, mxs_mci->regs + HW_SSP_CTRL0 + 8);
-	while (readl(mxs_mci->regs + HW_SSP_CTRL0) & SSP_CTRL0_SFTRST)
-		;
-}
-
 /* ------------------------- MCI API -------------------------------------- */
 
 /**
@@ -475,7 +462,7 @@ static int mxs_mci_initialize(struct mci_host *host, struct device_d *mci_dev)
 	writel(SSP_CTRL0_CLKGATE, mxs_mci->regs + HW_SSP_CTRL0 + 8);
 
 	/* reset the unit */
-	mxs_mci_reset(mxs_mci);
+	mxs_reset_block(mxs_mci->regs + HW_SSP_CTRL0, 0);
 
 	/* restore the last settings */
 	mxs_mci_setup_timeout(mxs_mci, 0xffff);
-- 
1.8.2.rc2


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Re: Make Chumby work again with its SD card

[Sascha Hauer]

On Tue, Apr 23, 2013 at 12:09:10PM +0200, Juergen Beisert wrote:
> Due to a missing resource size the Chumby isn't able to work with its SD card
> anymore. Instead it hangs forever. By using the generic block reset routine I
> was able to discover the cause. The following two patches makes the Chumby
> work again. At least the resource size patch should be applied to the current
> master.

Applied, first to master, second one to -next.

Sascha

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