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SubjectRe: [PATCH v4 07/12] soc: mediatek: cmdq: clear the event in cmdq initial flow
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Hi, Bibby:

On Mon, 2019-04-15 at 20:58 +0800, Bibby Hsieh wrote:
> GCE hardware stored event information in own internal sysram,
> if the initial value in those sysram is not zero value
> it will cause a situation that gce can wait the event immediately
> after client ask gce to wait event but not really trigger the
> corresponding hardware.
>
> In order to make sure that the wait event function is
> exactly correct, we need to clear the sysram value in
> cmdq initial flow.
>
> Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")

Reviewed-by: CK Hu <ck.hu@mediatek.com>

>
> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
> ---
> drivers/mailbox/mtk-cmdq-mailbox.c | 5 +++++
> include/linux/mailbox/mtk-cmdq-mailbox.h | 2 ++
> include/linux/soc/mediatek/mtk-cmdq.h | 3 ---
> 3 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
> index 6db1e2dd2dea..4e744cf2c3fb 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -33,6 +33,7 @@
> #define CMDQ_THR_END_ADDR 0x24
> #define CMDQ_THR_WAIT_TOKEN 0x30
> #define CMDQ_THR_PRIORITY 0x40
> +#define CMDQ_SYNC_TOKEN_UPDATE 0x68
>
> #define CMDQ_THR_ACTIVE_SLOT_CYCLES 0x3200
> #define CMDQ_THR_ENABLED 0x1
> @@ -103,8 +104,12 @@ static void cmdq_thread_resume(struct cmdq_thread *thread)
>
> static void cmdq_init(struct cmdq *cmdq)
> {
> + int i;
> +
> WARN_ON(clk_enable(cmdq->clock) < 0);
> writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base + CMDQ_THR_SLOT_CYCLES);
> + for (i = 0; i <= CMDQ_MAX_EVENT; i++)
> + writel(i, cmdq->base + CMDQ_SYNC_TOKEN_UPDATE);
> clk_disable(cmdq->clock);
> }
>
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index ccb73422c2fa..911475da7a53 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -19,6 +19,8 @@
> #define CMDQ_WFE_UPDATE BIT(31)
> #define CMDQ_WFE_WAIT BIT(15)
> #define CMDQ_WFE_WAIT_VALUE 0x1
> +/** cmdq event maximum */
> +#define CMDQ_MAX_EVENT 0x3ff
>
> /*
> * CMDQ_CODE_MASK:
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index 54ade13a9b15..4e8899972db4 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -13,9 +13,6 @@
>
> #define CMDQ_NO_TIMEOUT 0xffffffffu
>
> -/** cmdq event maximum */
> -#define CMDQ_MAX_EVENT 0x3ff
> -
> struct cmdq_pkt;
>
> struct cmdq_client {


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