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Date: Mon, 27 Jul 2020 18:06:27 +0900
From: Alexandre Courbot <acourbot@...omium.org>
To: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc: Tiffany Lin <tiffany.lin@...iatek.com>,
Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Yunfei Dong <yunfei.dong@...iatek.com>,
Maoguang Meng <maoguang.meng@...iatek.com>,
linux-media <linux-media@...r.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
devicetree <devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Pi-Hsun Shih <pihsun@...omium.org>
Subject: Re: [PATCH v3 01/16] media: mtk-vcodec: abstract firmware interface
On Thu, Jul 23, 2020 at 6:23 AM Ezequiel Garcia
<ezequiel@...guardiasur.com.ar> wrote:
>
> On Mon, 13 Jul 2020 at 03:09, Alexandre Courbot <acourbot@...omium.org> wrote:
> >
> > From: Yunfei Dong <yunfei.dong@...iatek.com>
> >
> > MT8183's codec firwmare is run by a different remote processor from
> > MT8173. While the firmware interface is basically the same, the way to
> > invoke it differs. Abstract all firmware calls under a layer that will
> > allow us to handle both firmware types transparently.
> >
> > Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> > [acourbot: refactor, cleanup and split]
> > Co-developed-by: Alexandre Courbot <acourbot@...omium.org>
> > Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
> > [pihsun: fix error path and add mtk_vcodec_fw_release]
> > Signed-off-by: Pi-Hsun Shih <pihsun@...omium.org>
> > Reviewed-by: Tiffany Lin <tiffany.lin@...iatek.com>
> > Acked-by: Tiffany Lin <tiffany.lin@...iatek.com>
> > ---
> > drivers/media/platform/mtk-vcodec/Makefile | 4 +-
> > .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 50 ++---
> > .../platform/mtk-vcodec/mtk_vcodec_dec_pm.c | 1 -
> > .../platform/mtk-vcodec/mtk_vcodec_drv.h | 5 +-
> > .../platform/mtk-vcodec/mtk_vcodec_enc_drv.c | 47 ++---
> > .../platform/mtk-vcodec/mtk_vcodec_enc_pm.c | 2 -
> > .../media/platform/mtk-vcodec/mtk_vcodec_fw.c | 172 ++++++++++++++++++
> > .../media/platform/mtk-vcodec/mtk_vcodec_fw.h | 36 ++++
> > .../platform/mtk-vcodec/mtk_vcodec_util.c | 1 -
> > .../platform/mtk-vcodec/vdec/vdec_h264_if.c | 1 -
> > .../platform/mtk-vcodec/vdec/vdec_vp8_if.c | 1 -
> > .../platform/mtk-vcodec/vdec/vdec_vp9_if.c | 1 -
> > .../media/platform/mtk-vcodec/vdec_drv_base.h | 2 -
> > .../media/platform/mtk-vcodec/vdec_drv_if.c | 1 -
> > .../media/platform/mtk-vcodec/vdec_vpu_if.c | 12 +-
> > .../media/platform/mtk-vcodec/vdec_vpu_if.h | 11 +-
> > .../platform/mtk-vcodec/venc/venc_h264_if.c | 15 +-
> > .../platform/mtk-vcodec/venc/venc_vp8_if.c | 8 +-
> > .../media/platform/mtk-vcodec/venc_drv_if.c | 1 -
> > .../media/platform/mtk-vcodec/venc_vpu_if.c | 17 +-
> > .../media/platform/mtk-vcodec/venc_vpu_if.h | 5 +-
> > 21 files changed, 290 insertions(+), 103 deletions(-)
> > create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c
> > create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.h
> >
> > diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
> > index 37b94b555fa1..b8636119ed0a 100644
> > --- a/drivers/media/platform/mtk-vcodec/Makefile
> > +++ b/drivers/media/platform/mtk-vcodec/Makefile
> > @@ -12,7 +12,7 @@ mtk-vcodec-dec-y := vdec/vdec_h264_if.o \
> > vdec_vpu_if.o \
> > mtk_vcodec_dec.o \
> > mtk_vcodec_dec_pm.o \
> > -
> > + mtk_vcodec_fw.o
> >
> > mtk-vcodec-enc-y := venc/venc_vp8_if.o \
> > venc/venc_h264_if.o \
> > @@ -25,5 +25,3 @@ mtk-vcodec-enc-y := venc/venc_vp8_if.o \
> >
> > mtk-vcodec-common-y := mtk_vcodec_intr.o \
> > mtk_vcodec_util.o\
> > -
> > -ccflags-y += -I$(srctree)/drivers/media/platform/mtk-vpu
> > 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 97a1b6664c20..4f07a5fcce7f 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > @@ -20,7 +20,7 @@
> > #include "mtk_vcodec_dec_pm.h"
> > #include "mtk_vcodec_intr.h"
> > #include "mtk_vcodec_util.h"
> > -#include "mtk_vpu.h"
> > +#include "mtk_vcodec_fw.h"
> >
> > #define VDEC_HW_ACTIVE 0x10
> > #define VDEC_IRQ_CFG 0x11
> > @@ -77,22 +77,6 @@ static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
> > return IRQ_HANDLED;
> > }
> >
> > -static void mtk_vcodec_dec_reset_handler(void *priv)
> > -{
> > - struct mtk_vcodec_dev *dev = priv;
> > - struct mtk_vcodec_ctx *ctx;
> > -
> > - mtk_v4l2_err("Watchdog timeout!!");
> > -
> > - mutex_lock(&dev->dev_mutex);
> > - list_for_each_entry(ctx, &dev->ctx_list, list) {
> > - ctx->state = MTK_STATE_ABORT;
> > - mtk_v4l2_debug(0, "[%d] Change to state MTK_STATE_ERROR",
> > - ctx->id);
> > - }
> > - mutex_unlock(&dev->dev_mutex);
> > -}
> > -
> > static int fops_vcodec_open(struct file *file)
> > {
> > struct mtk_vcodec_dev *dev = video_drvdata(file);
> > @@ -144,21 +128,20 @@ static int fops_vcodec_open(struct file *file)
> > if (v4l2_fh_is_singular(&ctx->fh)) {
> > mtk_vcodec_dec_pw_on(&dev->pm);
> > /*
> > - * vpu_load_firmware checks if it was loaded already and
> > - * does nothing in that case
> > + * Does nothing if firmware was already loaded.
> > */
> > - ret = vpu_load_firmware(dev->vpu_plat_dev);
> > + ret = mtk_vcodec_fw_load_firmware(dev->fw_handler);
> > if (ret < 0) {
> > /*
> > * Return 0 if downloading firmware successfully,
> > * otherwise it is failed
> > */
> > - mtk_v4l2_err("vpu_load_firmware failed!");
> > + mtk_v4l2_err("failed to load firmware!");
> > goto err_load_fw;
> > }
> >
> > dev->dec_capability =
> > - vpu_get_vdec_hw_capa(dev->vpu_plat_dev);
> > + mtk_vcodec_fw_get_vdec_capa(dev->fw_handler);
> > mtk_v4l2_debug(0, "decoder capability %x", dev->dec_capability);
> > }
> >
> > @@ -228,6 +211,8 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> > struct mtk_vcodec_dev *dev;
> > struct video_device *vfd_dec;
> > struct resource *res;
> > + phandle rproc_phandle;
> > + enum mtk_vcodec_fw_type fw_type;
> > int i, ret;
> >
> > dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> > @@ -237,19 +222,21 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> > INIT_LIST_HEAD(&dev->ctx_list);
> > dev->plat_dev = pdev;
> >
> > - dev->vpu_plat_dev = vpu_get_plat_device(dev->plat_dev);
> > - if (dev->vpu_plat_dev == NULL) {
> > - mtk_v4l2_err("[VPU] vpu device in not ready");
> > - return -EPROBE_DEFER;
> > + if (!of_property_read_u32(pdev->dev.of_node, "mediatek,vpu",
> > + &rproc_phandle)) {
> > + fw_type = VPU;
> > + } else {
> > + mtk_v4l2_err("Could not get vdec IPI device");
> > + return -ENODEV;
> > }
> > -
> > - vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_dec_reset_handler,
> > - dev, VPU_RST_DEC);
> > + dev->fw_handler = mtk_vcodec_fw_select(dev, fw_type, VPU_RST_DEC);
> > + if (IS_ERR(dev->fw_handler))
> > + return PTR_ERR(dev->fw_handler);
> >
> > ret = mtk_vcodec_init_dec_pm(dev);
> > if (ret < 0) {
> > dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
> > - return ret;
> > + goto err_dec_pm;
> > }
> >
> > for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) {
> > @@ -352,6 +339,8 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> > v4l2_device_unregister(&dev->v4l2_dev);
> > err_res:
> > mtk_vcodec_release_dec_pm(dev);
> > +err_dec_pm:
> > + mtk_vcodec_fw_release(dev->fw_handler);
> > return ret;
> > }
> >
> > @@ -376,6 +365,7 @@ static int mtk_vcodec_dec_remove(struct platform_device *pdev)
> >
> > v4l2_device_unregister(&dev->v4l2_dev);
> > mtk_vcodec_release_dec_pm(dev);
> > + mtk_vcodec_fw_release(dev->fw_handler);
> > return 0;
> > }
> >
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > index 5a6ec8fb52da..36dfe3fc056a 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > @@ -12,7 +12,6 @@
> >
> > #include "mtk_vcodec_dec_pm.h"
> > #include "mtk_vcodec_util.h"
> > -#include "mtk_vpu.h"
> >
> > int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *mtkdev)
> > {
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > index 9fd56dee7fd1..e132c4ec463a 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > @@ -309,13 +309,13 @@ struct mtk_vcodec_ctx {
> > * @m2m_dev_dec: m2m device for decoder
> > * @m2m_dev_enc: m2m device for encoder.
> > * @plat_dev: platform device
> > - * @vpu_plat_dev: mtk vpu platform device
> > * @ctx_list: list of struct mtk_vcodec_ctx
> > * @irqlock: protect data access by irq handler and work thread
> > * @curr_ctx: The context that is waiting for codec hardware
> > *
> > * @reg_base: Mapped address of MTK Vcodec registers.
> > *
> > + * @fw_handler: used to communicate with the firmware.
> > * @id_counter: used to identify current opened instance
> > *
> > * @encode_workqueue: encode work queue
> > @@ -344,12 +344,13 @@ struct mtk_vcodec_dev {
> > struct v4l2_m2m_dev *m2m_dev_dec;
> > struct v4l2_m2m_dev *m2m_dev_enc;
> > struct platform_device *plat_dev;
> > - struct platform_device *vpu_plat_dev;
> > struct list_head ctx_list;
> > spinlock_t irqlock;
> > struct mtk_vcodec_ctx *curr_ctx;
> > void __iomem *reg_base[NUM_MAX_VCODEC_REG_BASE];
> >
> > + struct mtk_vcodec_fw *fw_handler;
> > +
> > unsigned long id_counter;
> >
> > struct workqueue_struct *decode_workqueue;
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> > index 4d31f1ed113f..4340ea10afd0 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c
> > @@ -21,7 +21,7 @@
> > #include "mtk_vcodec_enc_pm.h"
> > #include "mtk_vcodec_intr.h"
> > #include "mtk_vcodec_util.h"
> > -#include "mtk_vpu.h"
> > +#include "mtk_vcodec_fw.h"
> >
> > module_param(mtk_v4l2_dbg_level, int, S_IRUGO | S_IWUSR);
> > module_param(mtk_vcodec_dbg, bool, S_IRUGO | S_IWUSR);
> > @@ -101,22 +101,6 @@ static irqreturn_t mtk_vcodec_enc_lt_irq_handler(int irq, void *priv)
> > return IRQ_HANDLED;
> > }
> >
> > -static void mtk_vcodec_enc_reset_handler(void *priv)
> > -{
> > - struct mtk_vcodec_dev *dev = priv;
> > - struct mtk_vcodec_ctx *ctx;
> > -
> > - mtk_v4l2_debug(0, "Watchdog timeout!!");
> > -
> > - mutex_lock(&dev->dev_mutex);
> > - list_for_each_entry(ctx, &dev->ctx_list, list) {
> > - ctx->state = MTK_STATE_ABORT;
> > - mtk_v4l2_debug(0, "[%d] Change to state MTK_STATE_ABORT",
> > - ctx->id);
> > - }
> > - mutex_unlock(&dev->dev_mutex);
> > -}
> > -
> > static int fops_vcodec_open(struct file *file)
> > {
> > struct mtk_vcodec_dev *dev = video_drvdata(file);
> > @@ -159,10 +143,10 @@ static int fops_vcodec_open(struct file *file)
> >
> > if (v4l2_fh_is_singular(&ctx->fh)) {
> > /*
> > - * vpu_load_firmware checks if it was loaded already and
> > + * load fireware to checks if it was loaded already and
> > * does nothing in that case
> > */
> > - ret = vpu_load_firmware(dev->vpu_plat_dev);
> > + ret = mtk_vcodec_fw_load_firmware(dev->fw_handler);
> > if (ret < 0) {
> > /*
> > * Return 0 if downloading firmware successfully,
> > @@ -173,7 +157,7 @@ static int fops_vcodec_open(struct file *file)
> > }
> >
> > dev->enc_capability =
> > - vpu_get_venc_hw_capa(dev->vpu_plat_dev);
> > + mtk_vcodec_fw_get_venc_capa(dev->fw_handler);
> > mtk_v4l2_debug(0, "encoder capability %x", dev->enc_capability);
> > }
> >
> > @@ -235,6 +219,8 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> > struct mtk_vcodec_dev *dev;
> > struct video_device *vfd_enc;
> > struct resource *res;
> > + phandle rproc_phandle;
> > + enum mtk_vcodec_fw_type fw_type;
> > int i, j, ret;
> >
> > dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> > @@ -244,19 +230,21 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> > INIT_LIST_HEAD(&dev->ctx_list);
> > dev->plat_dev = pdev;
> >
> > - dev->vpu_plat_dev = vpu_get_plat_device(dev->plat_dev);
> > - if (dev->vpu_plat_dev == NULL) {
> > - mtk_v4l2_err("[VPU] vpu device in not ready");
> > - return -EPROBE_DEFER;
> > + if (!of_property_read_u32(pdev->dev.of_node, "mediatek,vpu",
> > + &rproc_phandle)) {
> > + fw_type = VPU;
> > + } else {
> > + mtk_v4l2_err("Could not get venc IPI device");
> > + return -ENODEV;
> > }
> > -
> > - vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_enc_reset_handler,
> > - dev, VPU_RST_ENC);
> > + dev->fw_handler = mtk_vcodec_fw_select(dev, fw_type, VPU_RST_ENC);
> > + if (IS_ERR(dev->fw_handler))
> > + return PTR_ERR(dev->fw_handler);
> >
> > ret = mtk_vcodec_init_enc_pm(dev);
> > if (ret < 0) {
> > dev_err(&pdev->dev, "Failed to get mt vcodec clock source!");
> > - return ret;
> > + goto err_enc_pm;
> > }
> >
> > for (i = VENC_SYS, j = 0; i < NUM_MAX_VCODEC_REG_BASE; i++, j++) {
> > @@ -377,6 +365,8 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
> > v4l2_device_unregister(&dev->v4l2_dev);
> > err_res:
> > mtk_vcodec_release_enc_pm(dev);
> > +err_enc_pm:
> > + mtk_vcodec_fw_release(dev->fw_handler);
> > return ret;
> > }
> >
> > @@ -401,6 +391,7 @@ static int mtk_vcodec_enc_remove(struct platform_device *pdev)
> >
> > v4l2_device_unregister(&dev->v4l2_dev);
> > mtk_vcodec_release_enc_pm(dev);
> > + mtk_vcodec_fw_release(dev->fw_handler);
> > return 0;
> > }
> >
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c
> > index 3e2bfded79a6..ee22902aaa71 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c
> > @@ -12,8 +12,6 @@
> >
> > #include "mtk_vcodec_enc_pm.h"
> > #include "mtk_vcodec_util.h"
> > -#include "mtk_vpu.h"
> > -
> >
> > int mtk_vcodec_init_enc_pm(struct mtk_vcodec_dev *mtkdev)
> > {
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c
> > new file mode 100644
> > index 000000000000..967bb100a990
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw.c
> > @@ -0,0 +1,172 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +#include "mtk_vcodec_fw.h"
> > +#include "mtk_vcodec_util.h"
> > +#include "mtk_vcodec_drv.h"
> > +
> > +struct mtk_vcodec_fw_ops {
> > + int (*load_firmware)(struct mtk_vcodec_fw *fw);
> > + unsigned int (*get_vdec_capa)(struct mtk_vcodec_fw *fw);
> > + unsigned int (*get_venc_capa)(struct mtk_vcodec_fw *fw);
> > + void * (*map_dm_addr)(struct mtk_vcodec_fw *fw, u32 dtcm_dmem_addr);
> > + int (*ipi_register)(struct mtk_vcodec_fw *fw, int id,
> > + mtk_vcodec_ipi_handler handler, const char *name, void *priv);
> > + int (*ipi_send)(struct mtk_vcodec_fw *fw, int id, void *buf,
> > + unsigned int len, unsigned int wait);
> > +};
> > +
> > +struct mtk_vcodec_fw {
> > + enum mtk_vcodec_fw_type type;
> > + const struct mtk_vcodec_fw_ops *ops;
> > + struct platform_device *pdev;
> > +};
> > +
> > +static int mtk_vcodec_vpu_load_firmware(struct mtk_vcodec_fw *fw)
> > +{
> > + return vpu_load_firmware(fw->pdev);
> > +}
> > +
> > +static unsigned int mtk_vcodec_vpu_get_vdec_capa(struct mtk_vcodec_fw *fw)
> > +{
> > + return vpu_get_vdec_hw_capa(fw->pdev);
> > +}
> > +
> > +static unsigned int mtk_vcodec_vpu_get_venc_capa(struct mtk_vcodec_fw *fw)
> > +{
> > + return vpu_get_venc_hw_capa(fw->pdev);
> > +}
> > +
> > +static void *mtk_vcodec_vpu_map_dm_addr(struct mtk_vcodec_fw *fw,
> > + u32 dtcm_dmem_addr)
> > +{
> > + return vpu_mapping_dm_addr(fw->pdev, dtcm_dmem_addr);
> > +}
> > +
> > +static int mtk_vcodec_vpu_set_ipi_register(struct mtk_vcodec_fw *fw, int id,
> > + mtk_vcodec_ipi_handler handler, const char *name, void *priv)
> > +{
> > + /*
> > + * The handler we receive takes a void * as its first argument. We
> > + * cannot change this because it needs to be passed down to the rproc
> > + * subsystem when SCP is used. VPU takes a const argument, which is
> > + * more constrained, so the conversion below is safe.
> > + */
> > + ipi_handler_t handler_const = (ipi_handler_t)handler;
> > +
> > + return vpu_ipi_register(fw->pdev, id, handler_const, name, priv);
> > +}
> > +
> > +static int mtk_vcodec_vpu_ipi_send(struct mtk_vcodec_fw *fw, int id, void *buf,
> > + unsigned int len, unsigned int wait)
> > +{
> > + return vpu_ipi_send(fw->pdev, id, buf, len);
> > +}
> > +
> > +static const struct mtk_vcodec_fw_ops mtk_vcodec_vpu_msg = {
> > + .load_firmware = mtk_vcodec_vpu_load_firmware,
> > + .get_vdec_capa = mtk_vcodec_vpu_get_vdec_capa,
> > + .get_venc_capa = mtk_vcodec_vpu_get_venc_capa,
> > + .map_dm_addr = mtk_vcodec_vpu_map_dm_addr,
> > + .ipi_register = mtk_vcodec_vpu_set_ipi_register,
> > + .ipi_send = mtk_vcodec_vpu_ipi_send,
> > +};
> > +
> > +static void mtk_vcodec_reset_handler(void *priv)
> > +{
> > + struct mtk_vcodec_dev *dev = priv;
> > + struct mtk_vcodec_ctx *ctx;
> > +
> > + mtk_v4l2_err("Watchdog timeout!!");
> > +
> > + mutex_lock(&dev->dev_mutex);
> > + list_for_each_entry(ctx, &dev->ctx_list, list) {
> > + ctx->state = MTK_STATE_ABORT;
> > + mtk_v4l2_debug(0, "[%d] Change to state MTK_STATE_ABORT",
> > + ctx->id);
> > + }
> > + mutex_unlock(&dev->dev_mutex);
> > +}
> > +
> > +struct mtk_vcodec_fw *mtk_vcodec_fw_select(struct mtk_vcodec_dev *dev,
> > + enum mtk_vcodec_fw_type type,
> > + enum rst_id rst_id)
> > +{
> > + const struct mtk_vcodec_fw_ops *ops;
> > + struct mtk_vcodec_fw *fw;
> > + struct platform_device *fw_pdev = NULL;
> > +
> > + switch (type) {
> > + case VPU:
> > + ops = &mtk_vcodec_vpu_msg;
> > + fw_pdev = vpu_get_plat_device(dev->plat_dev);
> > + if (!fw_pdev) {
> > + mtk_v4l2_err("firmware device is not ready");
> > + return ERR_PTR(-EINVAL);
> > + }
> > + vpu_wdt_reg_handler(fw_pdev, mtk_vcodec_reset_handler,
> > + dev, rst_id);
> > + break;
> > + default:
> > + mtk_v4l2_err("invalid vcodec fw type");
> > + return ERR_PTR(-EINVAL);
> > + }
> > +
> > + fw = devm_kzalloc(&dev->plat_dev->dev, sizeof(*fw), GFP_KERNEL);
> > + if (!fw)
> > + return ERR_PTR(-EINVAL);
> > +
> > + fw->type = type;
> > + fw->ops = ops;
> > + fw->pdev = fw_pdev;
> > +
> > + return fw;
> > +}
> > +EXPORT_SYMBOL_GPL(mtk_vcodec_fw_select);
> > +
> > +void mtk_vcodec_fw_release(struct mtk_vcodec_fw *fw)
> > +{
> > + switch (fw->type) {
> > + case VPU:
> > + put_device(&fw->pdev->dev);
> > + break;
> > + }
> > +}
> > +EXPORT_SYMBOL_GPL(mtk_vcodec_fw_release);
> > +
>
> What are these symbols exported for?
This driver is made of three modules: mtk_vcodec_common,
mtk_vcodec_dec and mtk_vcodec_enc. These functions are used by both
the encoder and decoder module, so they need to be exported.
There is mistake in the patch though that I noticed while
investigating your comment: the file defining these functions
(mtk_vcodec_fw.c) is linked against the mtk_vcodec_dec module while it
should be part of mtk_vcodec_common, so thanks for asking. :)
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