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| author | Bibby Hsieh <bibby.hsieh@mediatek.com> | 2019-08-29 09:48:12 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-07 18:59:19 +0200 |
| commit | 15786d677bbc22a7a02fa2f6c443fe1e36b5af7b (patch) | |
| tree | 7ffca025cade0bd15ad9636f56fcc855d7b45ce3 /drivers | |
| parent | 1496f3d159342350e6aba4e2a89a0a5874f0d10d (diff) | |
| download | linux-stable-15786d677bbc22a7a02fa2f6c443fe1e36b5af7b.tar.gz linux-stable-15786d677bbc22a7a02fa2f6c443fe1e36b5af7b.tar.bz2 linux-stable-15786d677bbc22a7a02fa2f6c443fe1e36b5af7b.zip | |
mailbox: mediatek: cmdq: clear the event in cmdq initial flow
[ Upstream commit 6058f11870b8e6d4f5cc7b591097c00bf69a000d ]
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")
Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mailbox/mtk-cmdq-mailbox.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c index 00d5219094e5..48bba4913952 100644 --- a/drivers/mailbox/mtk-cmdq-mailbox.c +++ b/drivers/mailbox/mtk-cmdq-mailbox.c @@ -22,6 +22,7 @@ #define CMDQ_NUM_CMD(t) (t->cmd_buf_size / CMDQ_INST_SIZE) #define CMDQ_CURR_IRQ_STATUS 0x10 +#define CMDQ_SYNC_TOKEN_UPDATE 0x68 #define CMDQ_THR_SLOT_CYCLES 0x30 #define CMDQ_THR_BASE 0x100 #define CMDQ_THR_SIZE 0x80 @@ -104,8 +105,12 @@ 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); } |