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Date: Mon, 7 Nov 2022 16:40:14 +0100
From: Matthias Brugger <matthias.bgg@...il.com>
To: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>, jassisinghbrar@...il.com
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] mailbox: mtk-cmdq-mailbox: Use platform data directly
instead of copying
On 02/11/2022 11:07, AngeloGioacchino Del Regno wrote:
> Copying platform data to struct cmdq serves to no purpose, as that
> data is never modified during runtime: it's worth at this point
> storing a pointer to gce_plat in gce and.
>
> Remove all duplicated `struct gce_plat` members from `struct gce`
> and reuse the platform data across the driver to save some memory.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> ---
>
> This commit applies only on top of series [1]
>
> [1]: https://patchwork.kernel.org/project/linux-mediatek/list/?series=684195
>
> drivers/mailbox/mtk-cmdq-mailbox.c | 88 +++++++++++++-----------------
> 1 file changed, 39 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
> index c5229f377c5e..a460ee26eb11 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -75,15 +75,11 @@ struct cmdq {
> struct mbox_controller mbox;
> void __iomem *base;
> int irq;
> - u32 thread_nr;
> u32 irq_mask;
> + const struct gce_plat *pdata;
> struct cmdq_thread *thread;
> struct clk_bulk_data clocks[CMDQ_GCE_NUM_MAX];
> bool suspended;
> - u8 shift_pa;
> - bool control_by_sw;
> - bool sw_ddr_en;
> - u32 gce_num;
> };
>
> struct gce_plat {
> @@ -96,21 +92,21 @@ struct gce_plat {
>
> static void cmdq_sw_ddr_enable(struct cmdq *cmdq, bool enable)
> {
> - WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
> + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
>
> if (enable)
> writel(GCE_DDR_EN | GCE_CTRL_BY_SW, cmdq->base + GCE_GCTL_VALUE);
> else
> writel(GCE_CTRL_BY_SW, cmdq->base + GCE_GCTL_VALUE);
>
> - clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
> + clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
> }
>
> u8 cmdq_get_shift_pa(struct mbox_chan *chan)
> {
> struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
>
> - return cmdq->shift_pa;
> + return cmdq->pdata->shift;
> }
> EXPORT_SYMBOL(cmdq_get_shift_pa);
>
> @@ -144,10 +140,10 @@ static void cmdq_init(struct cmdq *cmdq)
> int i;
> u32 gctl_regval = 0;
>
> - WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
> - if (cmdq->control_by_sw)
> + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
> + if (cmdq->pdata->control_by_sw)
> gctl_regval = GCE_CTRL_BY_SW;
> - if (cmdq->sw_ddr_en)
> + if (cmdq->pdata->sw_ddr_en)
> gctl_regval |= GCE_DDR_EN;
>
> if (gctl_regval)
> @@ -156,7 +152,7 @@ static void cmdq_init(struct cmdq *cmdq)
> 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_bulk_disable(cmdq->gce_num, cmdq->clocks);
> + clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
> }
>
> static int cmdq_thread_reset(struct cmdq *cmdq, struct cmdq_thread *thread)
> @@ -201,7 +197,7 @@ static void cmdq_task_insert_into_thread(struct cmdq_task *task)
> prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
> prev_task_base[CMDQ_NUM_CMD(prev_task->pkt) - 1] =
> (u64)CMDQ_JUMP_BY_PA << 32 |
> - (task->pa_base >> task->cmdq->shift_pa);
> + (task->pa_base >> task->cmdq->pdata->shift);
> dma_sync_single_for_device(dev, prev_task->pa_base,
> prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
>
> @@ -235,7 +231,7 @@ static void cmdq_task_handle_error(struct cmdq_task *task)
> next_task = list_first_entry_or_null(&thread->task_busy_list,
> struct cmdq_task, list_entry);
> if (next_task)
> - writel(next_task->pa_base >> cmdq->shift_pa,
> + writel(next_task->pa_base >> cmdq->pdata->shift,
> thread->base + CMDQ_THR_CURR_ADDR);
> cmdq_thread_resume(thread);
> }
> @@ -266,7 +262,7 @@ static void cmdq_thread_irq_handler(struct cmdq *cmdq,
> else
> return;
>
> - curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) << cmdq->shift_pa;
> + curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) << cmdq->pdata->shift;
>
> list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
> list_entry) {
> @@ -289,7 +285,7 @@ static void cmdq_thread_irq_handler(struct cmdq *cmdq,
>
> if (list_empty(&thread->task_busy_list)) {
> cmdq_thread_disable(cmdq, thread);
> - clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
> + clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
> }
> }
>
> @@ -303,7 +299,7 @@ static irqreturn_t cmdq_irq_handler(int irq, void *dev)
> if (!(irq_status ^ cmdq->irq_mask))
> return IRQ_NONE;
>
> - for_each_clear_bit(bit, &irq_status, cmdq->thread_nr) {
> + for_each_clear_bit(bit, &irq_status, cmdq->pdata->thread_nr) {
> struct cmdq_thread *thread = &cmdq->thread[bit];
>
> spin_lock_irqsave(&thread->chan->lock, flags);
> @@ -323,7 +319,7 @@ static int cmdq_suspend(struct device *dev)
>
> cmdq->suspended = true;
>
> - for (i = 0; i < cmdq->thread_nr; i++) {
> + for (i = 0; i < cmdq->pdata->thread_nr; i++) {
> thread = &cmdq->thread[i];
> if (!list_empty(&thread->task_busy_list)) {
> task_running = true;
> @@ -334,10 +330,10 @@ static int cmdq_suspend(struct device *dev)
> if (task_running)
> dev_warn(dev, "exist running task(s) in suspend\n");
>
> - if (cmdq->sw_ddr_en)
> + if (cmdq->pdata->sw_ddr_en)
> cmdq_sw_ddr_enable(cmdq, false);
>
> - clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
> + clk_bulk_unprepare(cmdq->pdata->gce_num, cmdq->clocks);
>
> return 0;
> }
> @@ -346,10 +342,10 @@ static int cmdq_resume(struct device *dev)
> {
> struct cmdq *cmdq = dev_get_drvdata(dev);
>
> - WARN_ON(clk_bulk_prepare(cmdq->gce_num, cmdq->clocks));
> + WARN_ON(clk_bulk_prepare(cmdq->pdata->gce_num, cmdq->clocks));
> cmdq->suspended = false;
>
> - if (cmdq->sw_ddr_en)
> + if (cmdq->pdata->sw_ddr_en)
> cmdq_sw_ddr_enable(cmdq, true);
>
> return 0;
> @@ -359,10 +355,10 @@ static int cmdq_remove(struct platform_device *pdev)
> {
> struct cmdq *cmdq = platform_get_drvdata(pdev);
>
> - if (cmdq->sw_ddr_en)
> + if (cmdq->pdata->sw_ddr_en)
> cmdq_sw_ddr_enable(cmdq, false);
>
> - clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
> + clk_bulk_unprepare(cmdq->pdata->gce_num, cmdq->clocks);
> return 0;
> }
>
> @@ -388,7 +384,7 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
> task->pkt = pkt;
>
> if (list_empty(&thread->task_busy_list)) {
> - WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
> + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
>
> /*
> * The thread reset will clear thread related register to 0,
> @@ -398,9 +394,9 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
> */
> WARN_ON(cmdq_thread_reset(cmdq, thread) < 0);
>
> - writel(task->pa_base >> cmdq->shift_pa,
> + writel(task->pa_base >> cmdq->pdata->shift,
> thread->base + CMDQ_THR_CURR_ADDR);
> - writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
> + writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->pdata->shift,
> thread->base + CMDQ_THR_END_ADDR);
>
> writel(thread->priority, thread->base + CMDQ_THR_PRIORITY);
> @@ -409,20 +405,20 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
> } else {
> WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
> curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) <<
> - cmdq->shift_pa;
> + cmdq->pdata->shift;
> end_pa = readl(thread->base + CMDQ_THR_END_ADDR) <<
> - cmdq->shift_pa;
> + cmdq->pdata->shift;
> /* check boundary */
> if (curr_pa == end_pa - CMDQ_INST_SIZE ||
> curr_pa == end_pa) {
> /* set to this task directly */
> - writel(task->pa_base >> cmdq->shift_pa,
> + writel(task->pa_base >> cmdq->pdata->shift,
> thread->base + CMDQ_THR_CURR_ADDR);
> } else {
> cmdq_task_insert_into_thread(task);
> smp_mb(); /* modify jump before enable thread */
> }
> - writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
> + writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->pdata->shift,
> thread->base + CMDQ_THR_END_ADDR);
> cmdq_thread_resume(thread);
> }
> @@ -461,7 +457,7 @@ static void cmdq_mbox_shutdown(struct mbox_chan *chan)
> }
>
> cmdq_thread_disable(cmdq, thread);
> - clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
> + clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
>
> done:
> /*
> @@ -501,7 +497,7 @@ static int cmdq_mbox_flush(struct mbox_chan *chan, unsigned long timeout)
>
> cmdq_thread_resume(thread);
> cmdq_thread_disable(cmdq, thread);
> - clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
> + clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
>
> out:
> spin_unlock_irqrestore(&thread->chan->lock, flags);
> @@ -548,7 +544,6 @@ static int cmdq_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct cmdq *cmdq;
> int err, i;
> - struct gce_plat *plat_data;
> struct device_node *phandle = dev->of_node;
> struct device_node *node;
> int alias_id = 0;
> @@ -567,18 +562,13 @@ static int cmdq_probe(struct platform_device *pdev)
> if (cmdq->irq < 0)
> return cmdq->irq;
>
> - plat_data = (struct gce_plat *)of_device_get_match_data(dev);
> - if (!plat_data) {
> + cmdq->pdata = device_get_match_data(dev);
> + if (!cmdq->pdata) {
> dev_err(dev, "failed to get match data\n");
> return -EINVAL;
> }
>
> - cmdq->thread_nr = plat_data->thread_nr;
> - cmdq->shift_pa = plat_data->shift;
> - cmdq->control_by_sw = plat_data->control_by_sw;
> - cmdq->sw_ddr_en = plat_data->sw_ddr_en;
> - cmdq->gce_num = plat_data->gce_num;
> - cmdq->irq_mask = GENMASK(cmdq->thread_nr - 1, 0);
> + cmdq->irq_mask = GENMASK(cmdq->pdata->thread_nr - 1, 0);
> err = devm_request_irq(dev, cmdq->irq, cmdq_irq_handler, IRQF_SHARED,
> "mtk_cmdq", cmdq);
> if (err < 0) {
> @@ -589,10 +579,10 @@ static int cmdq_probe(struct platform_device *pdev)
> dev_dbg(dev, "cmdq device: addr:0x%p, va:0x%p, irq:%d\n",
> dev, cmdq->base, cmdq->irq);
>
> - if (cmdq->gce_num > 1) {
> + if (cmdq->pdata->gce_num > 1) {
> for_each_child_of_node(phandle->parent, node) {
> alias_id = of_alias_get_id(node, clk_name);
> - if (alias_id >= 0 && alias_id < cmdq->gce_num) {
> + if (alias_id >= 0 && alias_id < cmdq->pdata->gce_num) {
> cmdq->clocks[alias_id].id = clk_names[alias_id];
> cmdq->clocks[alias_id].clk = of_clk_get(node, 0);
> if (IS_ERR(cmdq->clocks[alias_id].clk)) {
> @@ -614,12 +604,12 @@ static int cmdq_probe(struct platform_device *pdev)
> }
>
> cmdq->mbox.dev = dev;
> - cmdq->mbox.chans = devm_kcalloc(dev, cmdq->thread_nr,
> + cmdq->mbox.chans = devm_kcalloc(dev, cmdq->pdata->thread_nr,
> sizeof(*cmdq->mbox.chans), GFP_KERNEL);
> if (!cmdq->mbox.chans)
> return -ENOMEM;
>
> - cmdq->mbox.num_chans = cmdq->thread_nr;
> + cmdq->mbox.num_chans = cmdq->pdata->thread_nr;
> cmdq->mbox.ops = &cmdq_mbox_chan_ops;
> cmdq->mbox.of_xlate = cmdq_xlate;
>
> @@ -627,12 +617,12 @@ static int cmdq_probe(struct platform_device *pdev)
> cmdq->mbox.txdone_irq = false;
> cmdq->mbox.txdone_poll = false;
>
> - cmdq->thread = devm_kcalloc(dev, cmdq->thread_nr,
> + cmdq->thread = devm_kcalloc(dev, cmdq->pdata->thread_nr,
> sizeof(*cmdq->thread), GFP_KERNEL);
> if (!cmdq->thread)
> return -ENOMEM;
>
> - for (i = 0; i < cmdq->thread_nr; i++) {
> + for (i = 0; i < cmdq->pdata->thread_nr; i++) {
> cmdq->thread[i].base = cmdq->base + CMDQ_THR_BASE +
> CMDQ_THR_SIZE * i;
> INIT_LIST_HEAD(&cmdq->thread[i].task_busy_list);
> @@ -647,7 +637,7 @@ static int cmdq_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, cmdq);
>
> - WARN_ON(clk_bulk_prepare(cmdq->gce_num, cmdq->clocks));
> + WARN_ON(clk_bulk_prepare(cmdq->pdata->gce_num, cmdq->clocks));
>
> cmdq_init(cmdq);
>
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