From e1d8008179fef782ecea4e7af1b9cd9891bd881e Mon Sep 17 00:00:00 2001 From: Lina Iyer Date: Tue, 24 Nov 2020 15:23:30 +0530 Subject: [PATCH] drivers: qcom: rpmh-rsc: Do not read back the register write on trigger When triggering a TCS to send its contents, reading back the trigger value may return an incorrect value. That is because, writing the trigger may raise an interrupt which could be handled immediately and the trigger value could be reset in the interrupt handler. A write_tcs_reg_sync() would read back the value that is written and try to match it to the value written to ensure that the value is written, but if that value is different, we may see false error for same. Reviewed-by: Douglas Anderson Signed-off-by: Lina Iyer Signed-off-by: Maulik Shah Link: https://lore.kernel.org/r/1606211610-15168-1-git-send-email-mkshah@codeaurora.org Signed-off-by: Bjorn Andersson --- drivers/soc/qcom/rpmh-rsc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c index 37969dcbaf14c..0b082ec894a1d 100644 --- a/drivers/soc/qcom/rpmh-rsc.c +++ b/drivers/soc/qcom/rpmh-rsc.c @@ -364,7 +364,7 @@ static void __tcs_set_trigger(struct rsc_drv *drv, int tcs_id, bool trigger) enable = TCS_AMC_MODE_ENABLE; write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable); enable |= TCS_AMC_MODE_TRIGGER; - write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable); + write_tcs_reg(drv, RSC_DRV_CONTROL, tcs_id, enable); } } -- 2.30.2