From patchwork Fri Apr 10 12:28:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Anderson X-Patchwork-Id: 237645 List-Id: U-Boot discussion From: seanga2 at gmail.com (Sean Anderson) Date: Fri, 10 Apr 2020 08:28:06 -0400 Subject: [PATCH v8 13/21] riscv: Clear pending interrupts before enabling IPIs In-Reply-To: <20200410122814.423237-1-seanga2@gmail.com> References: <20200410122814.423237-1-seanga2@gmail.com> Message-ID: <20200410122814.423237-14-seanga2@gmail.com> On some platforms (k210), the previous stage bootloader may have not cleared pending IPIs before transferring control to U-Boot. This can cause race conditions, as multiple harts all attempt to initialize the IPI controller at once. This patch clears IPIs before enabling them, ensuring that only one hart modifies shared memory at once. Signed-off-by: Sean Anderson Reviewed-by: Rick Chen --- Changes in v7: - Split of into its own patch arch/riscv/cpu/start.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index 6b3ff99c38..e8740c8568 100644 --- a/arch/riscv/cpu/start.S +++ b/arch/riscv/cpu/start.S @@ -67,6 +67,8 @@ _start: #else li t0, SIE_SSIE #endif + /* Clear any pending IPIs */ + csrc MODE_PREFIX(ip), t0 csrs MODE_PREFIX(ie), t0 #endif