On 11/26/2017 11:59 PM, Yangbo Lu wrote:
> The BRDCFG5[SPISDHC] register field of Qixis device is used
> to control SPI and SDHC signal routing.
>
> 10 = Force SDHC Mode
> - SPI_CS[0] is routed to CPLD for SDHC_VS use.
> - SPI_CS[1] is unused.
> - SPI_CS[2:3] are routed to the TDMRiser slot.
>
> 11 = Force eMMC Mode
> - SPI_CS[0:3] are routed to the eMMC card.
>
> 0X = Auto Mode
> - If SDHC_CS_B=0 (SDHC card installed): Use SDHC mode
> described above.
> - Else SDHC_CS_B=1 (no SDHC card installed): Use eMMC
> mode described above.
>
> In default the hardware uses auto mode, but sometimes we need
> to use force SDHC mode to support SD card hotplug, or SD sleep
> waking up in kernel. This patch is to support force SDHC mode
> by hwconfig.
Help me understand this. When you eject the SD card, does the CPLD logic
detect the SDHC_CS_B and change the signal routing? Are you trying to
fix the signal routing by forcing the mode?
>
> Signed-off-by: Yangbo Lu <yangbo...@nxp.com>
> ---
> board/freescale/ls1088a/ls1088a.c | 18 ++++++++++++++++++
> board/freescale/ls1088a/ls1088a_qixis.h | 6 ++++++
> include/configs/ls1088ardb.h | 2 ++
> 3 files changed, 26 insertions(+)
>
> diff --git a/board/freescale/ls1088a/ls1088a.c
> b/board/freescale/ls1088a/ls1088a.c
> index 96d9ae7f1d..60f40edb5a 100644
> --- a/board/freescale/ls1088a/ls1088a.c
> +++ b/board/freescale/ls1088a/ls1088a.c
> @@ -18,6 +18,7 @@
> #include <environment.h>
> #include <asm/arch-fsl-layerscape/soc.h>
> #include <asm/arch/ppa.h>
> +#include <hwconfig.h>
>
> #include "../common/qixis.h"
> #include "ls1088a_qixis.h"
> @@ -296,6 +297,23 @@ void board_retimer_init(void)
> select_i2c_ch_pca9547(I2C_MUX_CH_DEFAULT);
> }
>
> +#ifdef CONFIG_MISC_INIT_R
> +int misc_init_r(void)
> +{
> +#ifdef CONFIG_TARGET_LS1088ARDB
> + u8 brdcfg5;
> +
> + if (hwconfig("esdhc-force-sd")) {
> + brdcfg5 = QIXIS_READ(brdcfg[5]);
> + brdcfg5 &= ~BRDCFG5_SPISDHC_MASK;
> + brdcfg5 |= BRDCFG5_FORCE_SD;
> + QIXIS_WRITE(brdcfg[5], brdcfg5);
> + }
> +#endif
Would it be appropriate to check if eMMC is used before taking the
forced value?
York
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