Re: [PATCH v3 2/3] mailbox: mediatek: add support for adsp mailbox controller
From: Tzung-Bi Shih <hidden>
Date: 2021-11-24 10:25:29
Also in:
alsa-devel, linux-arm-kernel, linux-devicetree, lkml
On Wed, Nov 24, 2021 at 04:45:13PM +0800, allen-kh.cheng wrote:
quoted hunk ↗ jump to hunk
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index c9fc06c7e685..fc99d9fc80af 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig@@ -236,6 +236,13 @@ config MTK_CMDQ_MBOX critical time limitation, such as updating display configuration during the vblank. +config MTK_ADSP_IPC_MBOX + tristate "MediaTek ADSP Mailbox Controller" + depends on ARCH_MEDIATEK || COMPILE_TEST + help + Say yes here to add support for MediaTek ADSP IPC mailbox controller + driver. It is used to send short messages between processors with dsp.
Although the file didn't maintain alphabetical order, to be neat, moving MTK_ADSP_IPC_MBOX before MTK_CMDQ_MBOX makes more sense.
quoted hunk ↗ jump to hunk
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index c2089f04887e..479a9ae56d5e 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile@@ -51,6 +51,8 @@ obj-$(CONFIG_STM32_IPCC) += stm32-ipcc.o obj-$(CONFIG_MTK_CMDQ_MBOX) += mtk-cmdq-mailbox.o +obj-$(CONFIG_MTK_ADSP_IPC_MBOX) += mtk-adsp-mailbox.o +
Ditto. Move CONFIG_MTK_ADSP_IPC_MBOX before CONFIG_MTK_CMDQ_MBOX without blank line separation.
quoted hunk ↗ jump to hunk
diff --git a/drivers/mailbox/mtk-adsp-mailbox.c b/drivers/mailbox/mtk-adsp-mailbox.c
[...]
+static irqreturn_t mtk_adsp_ipc_irq_handler(int irq, void *data)
+{
+ struct mbox_chan *ch = (struct mbox_chan *)data;The cast should be able to remove.
+static irqreturn_t mtk_adsp_ipc_handler(int irq, void *data)
+{
+ struct mbox_chan *ch = (struct mbox_chan *)data;The cast should be able to remove.
+static int mtk_adsp_mbox_startup(struct mbox_chan *chan)
+{
+ struct adsp_mbox_ch_info *ch_info = chan->con_priv;
+ void __iomem *reg = ch_info->va_reg;
+
+ /* Clear DSP mbox command */
+ writel(0xFFFFFFFF, reg + MTK_ADSP_MBOX_IN_CMD_CLR);
+ writel(0xFFFFFFFF, reg + MTK_ADSP_MBOX_OUT_CMD_CLR);
+
+ return 0;
+}
+
+static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan)
+{
+ chan->con_priv = NULL;
+}Shall mtk_adsp_mbox_shutdown() also clear DSP mbox? I.e.: writel(0xFFFFFFFF, reg + MTK_ADSP_MBOX_IN_CMD_CLR); writel(0xFFFFFFFF, reg + MTK_ADSP_MBOX_OUT_CMD_CLR);
+static int mtk_adsp_mbox_send_data(struct mbox_chan *chan, void *data)
+{
+ struct adsp_mbox_ch_info *ch_info = chan->con_priv;
+ void __iomem *reg = ch_info->va_reg;
+
+ spin_lock(&ch_info->lock);
+ writel(ch_info->ipc_op_val, reg + MTK_ADSP_MBOX_IN_CMD);
+ spin_unlock(&ch_info->lock);Why does it need the lock? Is the write to MTK_ADSP_MBOX_IN_CMD a synchronous operation? - If yes, I failed to understand why does it need the lock. Every calls to mtk_adsp_mbox_send_data() should wait for the data transfer completion. - If no, I also failed to understand why. mtk_adsp_mbox_send_data() has no way to be aware of the transfer completion. Would expect a loop for checking the completion for the case.
+static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan)
+{
+ struct adsp_mbox_ch_info *ch_info = chan->con_priv;
+ void __iomem *reg = ch_info->va_reg;
+ u32 op = readl(reg + MTK_ADSP_MBOX_IN_CMD);
+
+ return (op == 0) ? true : false;To be concise, return readl(...) == 0;
+static int mtk_adsp_mbox_probe(struct platform_device *pdev)
+{[...]
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no adsp mbox register resource\n");
+ return -ENXIO;
+ }
+
+ size = resource_size(res);
+ priv->va_mboxreg = devm_ioremap(dev, (phys_addr_t)res->start, size);
+ if (IS_ERR(priv->va_mboxreg))
+ return PTR_ERR(priv->va_mboxreg);Use devm_platform_ioremap_resource(), it should be equivalent.
+ /* set adsp mbox channel info */ + ch_info = devm_kzalloc(mbox->dev, sizeof(*ch_info), GFP_KERNEL);
To be neat, use dev instead of mbox->dev.
+ ret = devm_mbox_controller_register(dev, &priv->mbox); + if (ret < 0) + dev_err(dev, "error: failed to register mailbox:%d\n", ret); + + return ret;
To be concise, return devm_mbox_controller_register(...); _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek