Re: [U-Boot] [PATCH 1/3 V2] esdhc: Workaround for card can't be detected on T4240QDS

[Zhang Haijun]

Thanks Pantelis.

I'll rework this patch as you suggested.

Thanks.

Regards,

Haijun


于 2014/1/9 18:42, Pantelis Antoniou 写道:

Hi Haijun,

On Dec 11, 2013, at 7:35 AM, Haijun Zhang wrote:

Card detection pin is ineffective on T4240QDS Rev1.0.
There are two cards can be connected to board.
1. eMMC card is built-in board, can not be removed. so
   For eMMC card it is always there.
2. Card detecting pin is functional for SDHC card in Rev2.0.

This workaround force sdhc driver scan and initialize the card
regardless of whether the card is inserted or not in case Rev1.0.

Signed-off-by: Haijun Zhang <haijun.zh...@freescale.com>
---
changes for V2:
        - Add the judgement condition for this broken card

drivers/mmc/fsl_esdhc.c    | 9 +++++++++
include/configs/T4240QDS.h | 2 ++
2 files changed, 11 insertions(+)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 134a02d..b3b5f37 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -548,6 +548,15 @@ static int esdhc_getcd(struct mmc *mmc)
        struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
        int timeout = 1000;

+       /*
+        * Card detecting pin is not functional on T4240QDS with rev 1.0 SoC.
+        * Presuming card is present.
+        */
+#if defined(CONFIG_T4240QDS)
+       if (!(readb(QIXIS_BASE + QIXIS_BRDCFG5) & QIXIS_MUX_SDHC) ||
+                       IS_SVR_REV(get_svr(), 1, 0))
+               return 1;
+#endif

I just don't like this. It's a bunch of completely board specific code dropped
in the middle of a generic driver.

Rework to something like this:

In the board file (T4240QDS)

#define CONFIG_ESDHC_DETECT_QUIRK \
        (!(readb(QIXIS_BASE + QIXIS_BRDCFG5) & QIXIS_MUX_SDHC) || \
                IS_SVR_REV(get_svr(), 1, 0)))

And do this in the driver:

#ifdef CONFIG_ESDHC_DETECT_QUIRK
        if (CONFIG_ESDHC_DETECT_QUIRK)
                return 1;
#endif
        
Do the same to all other quirks please.

        while (!(esdhc_read32(&regs->prsstat) & PRSSTAT_CINS) && --timeout)
                udelay(1000);

diff --git a/include/configs/T4240QDS.h b/include/configs/T4240QDS.h
index c96df54..955e6b9 100644
--- a/include/configs/T4240QDS.h
+++ b/include/configs/T4240QDS.h
@@ -165,6 +165,8 @@ unsigned long get_board_ddr_clk(void);
#define QIXIS_RCFG_CTL_RECONFIG_IDLE    0x20
#define QIXIS_RCFG_CTL_RECONFIG_START   0x21
#define QIXIS_RCFG_CTL_WATCHDOG_ENBLE   0x08
+#define QIXIS_BRDCFG5                  0x55
+#define QIXIS_MUX_SDHC                 2
#define QIXIS_BASE_PHYS         (0xf00000000ull | QIXIS_BASE)

#define CONFIG_SYS_CSPR3_EXT    (0xf)
--
1.8.4.1

Regards

-- Pantelis

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