[PATCH v12 05/12] dmaengine: dma: imx-sdma: add fw_loaded and is_ram_script

[Robin Gong]

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.g...@nxp.com>
Acked-By: Vinod Koul <vk...@kernel.org>
---
 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..cf02c3e 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_warn_once(sdmac->sdma->dev, "sdma firmware not ready!\n");
+               goto err_out;
+       }
+
        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);
-- 
2.7.4