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Message-ID: <CAJM55Z946EVyN50KcBmh7chOOnzwTOjwLR+Z_fCOrfin9j7LNA@mail.gmail.com>
Date: Mon, 27 Feb 2023 14:47:38 +0100
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Walker Chen <walker.chen@...rfivetech.com>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
Vinod Koul <vkoul@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor.dooley@...rochip.com>,
Palmer Dabbelt <palmer@...belt.com>, dmaengine@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 2/3] dmaengine: dw-axi-dmac: Add support for StarFive
JH7110 DMA
On Mon, 27 Feb 2023 at 14:11, Walker Chen <walker.chen@...rfivetech.com> wrote:
>
> Add DMA reset operation in device probe and use different configuration
> on CH_CFG registers according to match data.
>
> Signed-off-by: Walker Chen <walker.chen@...rfivetech.com>
> Reviewed-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
Hi Walker,
Firstly your Signed-off-by should be the last line.
I may have been unclear in my last review, sorry. I meant to give my
reviewed-by if you just removed the reset pointer that was never used.
This new version also adds a lot of new code.
Though, I'm glad you want to update the driver to use match data
rather than of_device_is_compatible, but then please update all uses
of of_device_is_compatible. With this patch starfive uses match data
and the intel,kmb-axi-dma still uses of_device_is_compatible.
More comments below..
> ---
> .../dma/dw-axi-dmac/dw-axi-dmac-platform.c | 34 +++++++++++++++++--
> drivers/dma/dw-axi-dmac/dw-axi-dmac.h | 7 ++++
> 2 files changed, 39 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> index bf85aa0979ec..400eeef707bf 100644
> --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> @@ -21,10 +21,12 @@
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/of_device.h>
> #include <linux/of_dma.h>
> #include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> #include <linux/property.h>
> +#include <linux/reset.h>
> #include <linux/slab.h>
> #include <linux/types.h>
>
> @@ -86,7 +88,8 @@ static inline void axi_chan_config_write(struct axi_dma_chan *chan,
>
> cfg_lo = (config->dst_multblk_type << CH_CFG_L_DST_MULTBLK_TYPE_POS |
> config->src_multblk_type << CH_CFG_L_SRC_MULTBLK_TYPE_POS);
> - if (chan->chip->dw->hdata->reg_map_8_channels) {
> + if (chan->chip->dw->hdata->reg_map_8_channels &&
> + !chan->chip->dw->hdata->use_cfg2) {
> cfg_hi = config->tt_fc << CH_CFG_H_TT_FC_POS |
> config->hs_sel_src << CH_CFG_H_HS_SEL_SRC_POS |
> config->hs_sel_dst << CH_CFG_H_HS_SEL_DST_POS |
> @@ -1142,7 +1145,7 @@ static int dma_chan_terminate_all(struct dma_chan *dchan)
> axi_chan_disable(chan);
>
> ret = readl_poll_timeout_atomic(chan->chip->regs + DMAC_CHEN, val,
> - !(val & chan_active), 1000, 10000);
> + !(val & chan_active), 1000, DMAC_TIMEOUT_US);
> if (ret == -ETIMEDOUT)
> dev_warn(dchan2dev(dchan),
> "%s failed to stop\n", axi_chan_name(chan));
> @@ -1367,6 +1370,17 @@ static int parse_device_properties(struct axi_dma_chip *chip)
> return 0;
> }
>
> +static int jh7110_rst_init(struct platform_device *pdev)
> +{
> + struct reset_control *resets;
> +
> + resets = devm_reset_control_array_get_exclusive(&pdev->dev);
> + if (IS_ERR(resets))
> + return PTR_ERR(resets);
> +
> + return reset_control_deassert(resets);
> +}
> +
> static int dw_probe(struct platform_device *pdev)
> {
> struct device_node *node = pdev->dev.of_node;
> @@ -1374,6 +1388,7 @@ static int dw_probe(struct platform_device *pdev)
> struct resource *mem;
> struct dw_axi_dma *dw;
> struct dw_axi_dma_hcfg *hdata;
> + const struct axi_dma_chip_config *ccfg;
> u32 i;
> int ret;
>
> @@ -1416,6 +1431,15 @@ static int dw_probe(struct platform_device *pdev)
> if (IS_ERR(chip->cfgr_clk))
> return PTR_ERR(chip->cfgr_clk);
>
> + ccfg = of_device_get_match_data(&pdev->dev);
> + if (ccfg) {
> + ret = ccfg->rst_init(pdev);
> + if (ret)
> + return ret;
> +
> + chip->dw->hdata->use_cfg2 = ccfg->use_cfg2;
> + }
> +
> ret = parse_device_properties(chip);
> if (ret)
> return ret;
> @@ -1557,9 +1581,15 @@ static const struct dev_pm_ops dw_axi_dma_pm_ops = {
> SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
> };
>
> +static const struct axi_dma_chip_config jh7110_chip_config = {
> + .rst_init = jh7110_rst_init,
> + .use_cfg2 = true,
> +};
> +
> static const struct of_device_id dw_dma_of_id_table[] = {
> { .compatible = "snps,axi-dma-1.01a" },
> { .compatible = "intel,kmb-axi-dma" },
> + { .compatible = "starfive,jh7110-axi-dma", .data = &jh7110_chip_config },
> {}
> };
> MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
> diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
> index e9d5eb0fd594..7b404ae9a26a 100644
> --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
> +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
> @@ -21,6 +21,7 @@
> #define DMAC_MAX_CHANNELS 16
> #define DMAC_MAX_MASTERS 2
> #define DMAC_MAX_BLK_SIZE 0x200000
> +#define DMAC_TIMEOUT_US 200000
>
> struct dw_axi_dma_hcfg {
> u32 nr_channels;
> @@ -33,6 +34,7 @@ struct dw_axi_dma_hcfg {
> /* Register map for DMAX_NUM_CHANNELS <= 8 */
> bool reg_map_8_channels;
> bool restrict_axi_burst_len;
> + bool use_cfg2;
> };
>
> struct axi_dma_chan {
> @@ -72,6 +74,11 @@ struct axi_dma_chip {
> struct dw_axi_dma *dw;
> };
>
> +struct axi_dma_chip_config {
> + int (*rst_init)(struct platform_device *pdev);
Please just spell reset in full, it's not that much longer.
> + bool use_cfg2;
> +};
> +
This struct is only used in dw-axi-dmac-platform.c above, so no need
to add it here.
> /* LLI == Linked List Item */
> struct __packed axi_dma_lli {
> __le64 sar;
> --
> 2.17.1
>
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