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Message-ID: <ZMArFGTabcc2j6i9@p14s>
Date: Tue, 25 Jul 2023 14:05:40 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Tinghan Shen <tinghan.shen@...iatek.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v15 08/13] remoteproc: mediatek: Remove dependency of
MT8195 SCP L2TCM power control on dual-core SCP
On Fri, Jul 21, 2023 at 10:41:27AM +0800, Tinghan Shen wrote:
> Previously, SCP core 0 controlled the power of L2TCM and dictated that
> SCP core 1 could only boot after SCP core 0. To address this constraint,
> extracted the power control flow of L2TCM and made it shared
> between both cores, enabling support of arbitrary boot order.
>
s/of/for
> The flow for controlling L2TCM power has been incorporated into the
> mt8195_scp_before_load() and mt8195_scp_stop() APIs, which are
> respectively invoked during the rproc->ops->start() and
> rproc->ops->stop() operations. These APIs effectively serve the same
> purpose as the rproc prepare()/unprepare() APIs."
>
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> ---
> drivers/remoteproc/mtk_common.h | 3 ++
> drivers/remoteproc/mtk_scp.c | 71 ++++++++++++++++++++++++++-------
> 2 files changed, 59 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> index 1438159ae736..fea05bbba9aa 100644
> --- a/drivers/remoteproc/mtk_common.h
> +++ b/drivers/remoteproc/mtk_common.h
> @@ -106,6 +106,9 @@ struct mtk_scp_of_cluster {
> size_t l1tcm_size;
> phys_addr_t l1tcm_phys;
> struct list_head mtk_scp_list;
> + /* Prevent concurrent operations of this structure and L2TCM power control. */
> + struct mutex cluster_lock;
> + u32 l2tcm_refcnt;
> };
>
> struct mtk_scp {
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index 34095a461e15..c624f9c3db17 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -454,19 +454,37 @@ static int mt8192_scp_before_load(struct mtk_scp *scp)
> return 0;
> }
>
> -static int mt8195_scp_before_load(struct mtk_scp *scp)
> +static int mt8195_scp_l2tcm_on(struct mtk_scp *scp)
> {
> - /* clear SPM interrupt, SCP2SPM_IPC_CLR */
> - writel(0xff, scp->cluster->reg_base + MT8192_SCP2SPM_IPC_CLR);
> + struct mtk_scp_of_cluster *scp_cluster = scp->cluster;
> +
> + mutex_lock(&scp_cluster->cluster_lock);
> +
> + if (scp_cluster->l2tcm_refcnt == 0) {
> + /* clear SPM interrupt, SCP2SPM_IPC_CLR */
> + writel(0xff, scp->cluster->reg_base + MT8192_SCP2SPM_IPC_CLR);
> +
> + /* Power on L2TCM */
> + scp_sram_power_on(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> + scp_sram_power_on(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> + scp_sram_power_on(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> + scp_sram_power_on(scp->cluster->reg_base + MT8192_L1TCM_SRAM_PDN,
> + MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
> + }
> +
> + scp_cluster->l2tcm_refcnt += 1;
>
> + mutex_unlock(&scp_cluster->cluster_lock);
> +
> + return 0;
> +}
> +
> +static int mt8195_scp_before_load(struct mtk_scp *scp)
> +{
> writel(1, scp->cluster->reg_base + MT8192_CORE0_SW_RSTN_SET);
>
> - /* enable SRAM clock */
> - scp_sram_power_on(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> - scp_sram_power_on(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> - scp_sram_power_on(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> - scp_sram_power_on(scp->cluster->reg_base + MT8192_L1TCM_SRAM_PDN,
> - MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
> + mt8195_scp_l2tcm_on(scp);
> +
> scp_sram_power_on(scp->cluster->reg_base + MT8192_CPU0_SRAM_PD, 0);
>
> /* enable MPU for all memory regions */
> @@ -479,6 +497,8 @@ static int mt8195_scp_c1_before_load(struct mtk_scp *scp)
> {
> scp->data->scp_reset_assert(scp);
>
> + mt8195_scp_l2tcm_on(scp);
> +
> scp_sram_power_on(scp->cluster->reg_base + MT8195_CPU1_SRAM_PD, 0);
>
> /* enable MPU for all memory regions */
> @@ -645,14 +665,31 @@ static void mt8192_scp_stop(struct mtk_scp *scp)
> writel(0, scp->cluster->reg_base + MT8192_CORE0_WDT_CFG);
> }
>
> +static void mt8195_scp_l2tcm_off(struct mtk_scp *scp)
> +{
> + struct mtk_scp_of_cluster *scp_cluster = scp->cluster;
> +
> + mutex_lock(&scp_cluster->cluster_lock);
> +
> + if (scp_cluster->l2tcm_refcnt > 0)
> + scp_cluster->l2tcm_refcnt -= 1;
> +
> + if (scp_cluster->l2tcm_refcnt == 0) {
> + /* Power off L2TCM */
> + scp_sram_power_off(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> + scp_sram_power_off(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> + scp_sram_power_off(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> + scp_sram_power_off(scp->cluster->reg_base + MT8192_L1TCM_SRAM_PDN,
> + MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
> + }
> +
> + mutex_unlock(&scp_cluster->cluster_lock);
> +}
> +
> static void mt8195_scp_stop(struct mtk_scp *scp)
> {
> - /* Disable SRAM clock */
> - scp_sram_power_off(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> - scp_sram_power_off(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> - scp_sram_power_off(scp->cluster->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> - scp_sram_power_off(scp->cluster->reg_base + MT8192_L1TCM_SRAM_PDN,
> - MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
> + mt8195_scp_l2tcm_off(scp);
> +
> scp_sram_power_off(scp->cluster->reg_base + MT8192_CPU0_SRAM_PD, 0);
>
> /* Disable SCP watchdog */
> @@ -661,6 +698,8 @@ static void mt8195_scp_stop(struct mtk_scp *scp)
>
> static void mt8195_scp_c1_stop(struct mtk_scp *scp)
> {
> + mt8195_scp_l2tcm_off(scp);
> +
> /* Power off CPU SRAM */
> scp_sram_power_off(scp->cluster->reg_base + MT8195_CPU1_SRAM_PD, 0);
>
> @@ -1103,6 +1142,7 @@ static int scp_probe(struct platform_device *pdev)
> }
>
> INIT_LIST_HEAD(&scp_cluster->mtk_scp_list);
> + mutex_init(&scp_cluster->cluster_lock);
>
> ret = devm_of_platform_populate(dev);
> if (ret)
> @@ -1126,6 +1166,7 @@ static void scp_remove(struct platform_device *pdev)
> rproc_del(scp->rproc);
> scp_free(scp);
> }
> + mutex_destroy(&scp_cluster->cluster_lock);
> }
>
> static const struct mtk_scp_of_data mt8183_of_data = {
> --
> 2.18.0
>
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