Re: [PATCH v11, 01/19] media: mtk-vcodec: Get numbers of register bases from DT
From: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Date: 2021-11-30 13:22:02
Also in:
dri-devel, linux-arm-kernel, linux-media, linux-mediatek, lkml
Le 29/11/2021 à 04:41, Yunfei Dong a écrit :
quoted hunk ↗ jump to hunk
Different platform may has different numbers of register bases. Gets the numbers of register bases from DT (sizeof(u32) * 4 bytes for each). Reviewed-by: Tzung-Bi Shih<redacted> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com> --- .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 37 ++++++++++++++----- 1 file changed, 28 insertions(+), 9 deletions(-)diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c index e6e6a8203eeb..59caf2163349 100644 --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c@@ -78,6 +78,30 @@ static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv) return IRQ_HANDLED; } +static int mtk_vcodec_get_reg_bases(struct mtk_vcodec_dev *dev) +{ + struct platform_device *pdev = dev->plat_dev; + int reg_num, i; + + /* Sizeof(u32) * 4 bytes for each register base. */ + reg_num = of_property_count_elems_of_size(pdev->dev.of_node, "reg", + sizeof(u32) * 4);
It looks strange for me to have a "reg" size equal to sizeof(u32) * 4. Usually we more see reg size = sizeof(u32).
+ if (reg_num <= 0 || reg_num > NUM_MAX_VDEC_REG_BASE) {If reg_num = NUM_MAX_VDEC_REG_BASE you will iterate out of bounds of dev->reg_base array. That never happens because dev->reg_base size equal NUM_MAX_VCODEC_REG_BASE. The question is what is the real needed size for dev->reg_base array ? NUM_MAX_VDEC_REG_BASE or NUM_MAX_VCODEC_REG_BASE ? Regards, Benjamin
quoted hunk ↗ jump to hunk
+ dev_err(&pdev->dev, "Invalid register property size: %d\n", reg_num); + return -EINVAL; + } + + for (i = 0; i < reg_num; i++) { + dev->reg_base[i] = devm_platform_ioremap_resource(pdev, i); + if (IS_ERR(dev->reg_base[i])) + return PTR_ERR(dev->reg_base[i]); + + mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]); + } + + return 0; +} + static int fops_vcodec_open(struct file *file) { struct mtk_vcodec_dev *dev = video_drvdata(file);@@ -206,7 +230,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev) struct resource *res; phandle rproc_phandle; enum mtk_vcodec_fw_type fw_type; - int i, ret; + int ret; dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); if (!dev)@@ -238,14 +262,9 @@ static int mtk_vcodec_probe(struct platform_device *pdev) goto err_dec_pm; } - for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) { - dev->reg_base[i] = devm_platform_ioremap_resource(pdev, i); - if (IS_ERR((__force void *)dev->reg_base[i])) { - ret = PTR_ERR((__force void *)dev->reg_base[i]); - goto err_res; - } - mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]); - } + ret = mtk_vcodec_get_reg_bases(dev); + if (ret) + goto err_res; res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (res == NULL) {