Re: [PATCH v10 05/12] dmaengine: dma: imx-sdma: add fw_loaded and is_ram_script

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Hi Robin,

On 30.06.20 15:31, Robin Gong wrote:
Add 'fw_loaded' and 'is_ram_script' to check if the script used by channel
is ram script and it's loaded or not, so that could prevent meaningless
following malloc dma descriptor and bd allocate in sdma_transfer_init(),
otherwise memory may be consumed out potentially without free in case
that spi fallback into pio while dma transfer failed by sdma firmware not
ready(next ERR009165 patch depends on sdma RAM scripts/firmware).

Signed-off-by: Robin Gong <yibin.gong@xxxxxxx>
Acked-By: Vinod Koul <vkoul@xxxxxxxxxx>
---
  drivers/dma/imx-sdma.c | 13 +++++++++++++
  1 file changed, 13 insertions(+)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 5411e01e..ce1c83e 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -379,6 +379,7 @@ struct sdma_channel {
  	enum dma_status			status;
  	struct imx_dma_data		data;
  	struct work_struct		terminate_worker;
+	bool				is_ram_script;
  };
#define IMX_DMA_SG_LOOP BIT(0)
@@ -443,6 +444,7 @@ struct sdma_engine {
  	struct sdma_buffer_descriptor	*bd0;
  	/* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/
  	bool				clk_ratio;
+	bool                            fw_loaded;
  };
static int sdma_config_write(struct dma_chan *chan,
@@ -929,6 +931,7 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
  	case IMX_DMATYPE_SSI_DUAL:
  		per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
  		emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
+		sdmac->is_ram_script = true;
  		break;
  	case IMX_DMATYPE_SSI_SP:
  	case IMX_DMATYPE_MMC:
@@ -943,6 +946,7 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
  		per_2_emi = sdma->script_addrs->asrc_2_mcu_addr;
  		emi_2_per = sdma->script_addrs->asrc_2_mcu_addr;
  		per_2_per = sdma->script_addrs->per_2_per_addr;
+		sdmac->is_ram_script = true;
  		break;
  	case IMX_DMATYPE_ASRC_SP:
  		per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
@@ -1339,6 +1343,11 @@ static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
  {
  	struct sdma_desc *desc;
+ if (!sdmac->sdma->fw_loaded && sdmac->is_ram_script) {
+		dev_err(sdmac->sdma->dev, "sdma firmware not ready!\n");
+		goto err_out;
+	}

I tried your v10 patches on next-20200722 with i.MX8MM and it mostly seems to work fine.

When I tried first, I had the imx-sdma driver compiled into the kernel, so it didn't load the firmware and fell back to the ROM scripts. With this, SPI transactions work just fine, but I got the above error message printed continuously when sending data in SPI3 via spidev.

When I build imx-sdma as a module, the firmware is loaded correctly and everything works as expected.

Can you have a look at this and provide a fix?

Thanks,
Frieder

+
  	desc = kzalloc((sizeof(*desc)), GFP_NOWAIT);
  	if (!desc)
  		goto err_out;
@@ -1589,6 +1598,8 @@ static int sdma_config_write(struct dma_chan *chan,
  {
  	struct sdma_channel *sdmac = to_sdma_chan(chan);
+ sdmac->is_ram_script = false;
+
  	if (direction == DMA_DEV_TO_MEM) {
  		sdmac->per_address = dmaengine_cfg->src_addr;
  		sdmac->watermark_level = dmaengine_cfg->src_maxburst *
@@ -1768,6 +1779,8 @@ static void sdma_load_firmware(const struct firmware *fw, void *context)
sdma_add_scripts(sdma, addr); + sdma->fw_loaded = true;
+
  	dev_info(sdma->dev, "loaded firmware %d.%d\n",
  			header->version_major,
  			header->version_minor);




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