From ff3ea536023e8a40c499f884bdc3cc5aec5b1e25 Mon Sep 17 00:00:00 2001 From: Tzung-Bi Shih Date: Wed, 27 Jan 2021 16:31:34 +0800 Subject: remoteproc/mediatek: enable MPU for all memory regions in MT8192 SCP The register MT8192_CORE0_MEM_ATT_PREDEF contains attributes for each memory region. It defines whether a memory region can be managed by MPU or not. In the past, due to the default settings in the register, MT8192 SCP works luckily. After enabling L1TCM, SCP starts to access memory region that is not included in the default settings. As a result, SCP hangs. Enables MPU for all memory regions in MT8192 SCP. Note that the register is read only once when SCP resets. Thus, it must be set from kernel side. Reviewed-by: Mathieu Poirier Signed-off-by: Tzung-Bi Shih Link: https://lore.kernel.org/r/20210127083136.3745652-3-tzungbi@google.com Signed-off-by: Bjorn Andersson --- drivers/remoteproc/mtk_scp.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/remoteproc/mtk_scp.c') diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c index d83e1164f02f..05b157689121 100644 --- a/drivers/remoteproc/mtk_scp.c +++ b/drivers/remoteproc/mtk_scp.c @@ -371,6 +371,9 @@ static int mt8192_scp_before_load(struct mtk_scp *scp) mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN); mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD); + /* enable MPU for all memory regions */ + writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF); + return 0; } -- cgit