On 3/26/20 1:09 AM, Matthias Brugger wrote:
On 24/03/2020 23:58, Jaehoon Chung wrote:
Enable SDHCI_SDMA configuration.
Signed-off-by: Jaehoon Chung jh80.chung@samsung.com Reviewed-by: Peng Fan peng.fan@nxp.com Reviewed-by: Minkyu Kang mk7.kang@samsung.com
configs/rpi_4_32b_defconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/configs/rpi_4_32b_defconfig b/configs/rpi_4_32b_defconfig index 72cda5d949..7189914606 100644 --- a/configs/rpi_4_32b_defconfig +++ b/configs/rpi_4_32b_defconfig @@ -25,6 +25,7 @@ CONFIG_DFU_MMC=y CONFIG_DM_KEYBOARD=y CONFIG_DM_MMC=y CONFIG_MMC_SDHCI=y +CONFIG_MMC_SDHCI_SDMA=y
RPi4 can only do DMA transfers to the first GiB of memory. I wasn't sucessfull in understanding the mmc/sdhci code to see where we take the dma-ranges property into account so that we don't use an address > 1 GiB.
Sorry i don't understand clearly what you said.
Are we safe in this regard? If we are, then we can also enable this for rpi_4_defconfig and rpi_arm64_defconfig I think.
I checked rpi_arm64_defconfig history. it's unified config for RPi3/RPI4. As i know, RPi3 doesn't support SDMA mode. So i don't have a plan to apply rpi_arm64_defconfig. (If i understood wrong, let me know,plz.)
I have tested SDMA mode With rpi_4_defconfig / rpi_4_32b_defconfig. Test Environment - Target : RPI4 (1G/2G/4G) target - config : rpi_4_defconfig / rpi_4_32b_defconfig
Read/write some files from Sd-card. Read/write performance is increased than before.
I will resend with rpi_4_defconfig, except rpi_arm64_defconfig.
Best Regards, Jaehoon Chung
Regards, Matthias
CONFIG_MMC_SDHCI_BCM2835=y CONFIG_DM_ETH=y CONFIG_BCMGENET=y