Searched hist:"935 a665e15dcda3b0b986829f32e2724db1f20fc" (Results 1 – 2 of 2) sorted by relevance
/linux/drivers/mmc/host/ |
H A D | dw_mmc.h | diff 935a665e15dcda3b0b986829f32e2724db1f20fc Thu Jan 14 02:08:02 CET 2016 Shawn Lin <shawn.lin@rock-chips.com> mmc: dw_mmc: add hw_reset support
This patch implement hw_reset function for DesignWare MMC controller. By adding this feature, mmc blk can do some basic recovery.
Set the following resets: software reset – BMOD[0] for IDMAC only DMA reset - CTRL[2] FIFO reset - CTRL[1] bits
Program the CARD_RESET register with a value of 0 for the bit corresponding to the card number; This programming asserts the RST_n signal and resets the card. After a minimum of 1 ?s, de-asserts the RST_n signal and takes the card out of reset. The application can program a new CMD only after a minimum of 200 us
This implementation can be easily tested by cutting off->On vmmc while doing data accessing in background to simulate that case.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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H A D | dw_mmc.c | diff 935a665e15dcda3b0b986829f32e2724db1f20fc Thu Jan 14 02:08:02 CET 2016 Shawn Lin <shawn.lin@rock-chips.com> mmc: dw_mmc: add hw_reset support
This patch implement hw_reset function for DesignWare MMC controller. By adding this feature, mmc blk can do some basic recovery.
Set the following resets: software reset – BMOD[0] for IDMAC only DMA reset - CTRL[2] FIFO reset - CTRL[1] bits
Program the CARD_RESET register with a value of 0 for the bit corresponding to the card number; This programming asserts the RST_n signal and resets the card. After a minimum of 1 ?s, de-asserts the RST_n signal and takes the card out of reset. The application can program a new CMD only after a minimum of 200 us
This implementation can be easily tested by cutting off->On vmmc while doing data accessing in background to simulate that case.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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