Re: [PATCH v6 6/9] drm/hisilicon/hibmc: Add encoder for VDAC

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On Fri, Oct 28, 2016 at 3:27 AM, Rongrong Zou <zourongrong@xxxxxxxxx> wrote:
> Add encoder funcs and helpers for VDAC.
>
> Signed-off-by: Rongrong Zou <zourongrong@xxxxxxxxx>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/Makefile         |  2 +-
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c  |  6 ++
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h  |  2 +
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 89 ++++++++++++++++++++++++
>  4 files changed, 98 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/hisilicon/hibmc/Makefile
> index 72e107e..e04f114 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/Makefile
> +++ b/drivers/gpu/drm/hisilicon/hibmc/Makefile
> @@ -1,5 +1,5 @@
>  ccflags-y := -Iinclude/drm
> -hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_fbdev.o hibmc_drm_power.o hibmc_ttm.o
> +hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm_fbdev.o hibmc_drm_power.o hibmc_ttm.o
>
>  obj-$(CONFIG_DRM_HISI_HIBMC)   +=hibmc-drm.o
>  #obj-y += hibmc-drm.o
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index 303cd36..ba191e1 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -125,6 +125,12 @@ static int hibmc_kms_init(struct hibmc_drm_device *hidev)
>                 return ret;
>         }
>
> +       ret = hibmc_encoder_init(hidev);
> +       if (ret) {
> +               DRM_ERROR("failed to init encoder\n");
> +               return ret;
> +       }
> +
>         return 0;
>  }
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> index 5731ec2..401cea4 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> @@ -47,6 +47,7 @@ struct hibmc_drm_device {
>         struct drm_device  *dev;
>         struct drm_plane plane;
>         struct drm_crtc crtc;
> +       struct drm_encoder encoder;

Same comment here, you don't need to keep track of this

>         bool mode_config_initialized;
>
>         /* ttm */
> @@ -87,6 +88,7 @@ static inline struct hibmc_bo *gem_to_hibmc_bo(struct drm_gem_object *gem)
>
>  int hibmc_plane_init(struct hibmc_drm_device *hidev);
>  int hibmc_crtc_init(struct hibmc_drm_device *hidev);
> +int hibmc_encoder_init(struct hibmc_drm_device *hidev);
>  int hibmc_fbdev_init(struct hibmc_drm_device *hidev);
>  void hibmc_fbdev_fini(struct hibmc_drm_device *hidev);
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> new file mode 100644
> index 0000000..953f659
> --- /dev/null
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> @@ -0,0 +1,89 @@
> +/* Hisilicon Hibmc SoC drm driver
> + *
> + * Based on the bochs drm driver.
> + *
> + * Copyright (c) 2016 Huawei Limited.
> + *
> + * Author:
> + *     Rongrong Zou <zourongrong@xxxxxxxxxx>
> + *     Rongrong Zou <zourongrong@xxxxxxxxx>
> + *     Jianhua Li <lijianhua@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + */
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +
> +#include "hibmc_drm_drv.h"
> +#include "hibmc_drm_regs.h"
> +
> +static int defx = 800;
> +static int defy = 600;
> +
> +module_param(defx, int, 0444);
> +module_param(defy, int, 0444);
> +MODULE_PARM_DESC(defx, "default x resolution");
> +MODULE_PARM_DESC(defy, "default y resolution");

Not used, and I'm not sure these are a good idea

> +
> +static void hibmc_encoder_disable(struct drm_encoder *encoder)
> +{
> +}
> +
> +static void hibmc_encoder_enable(struct drm_encoder *encoder)
> +{
> +}

Null-checked, no need to stub

> +
> +static void hibmc_encoder_mode_set(struct drm_encoder *encoder,
> +                                  struct drm_display_mode *mode,
> +                                  struct drm_display_mode *adj_mode)
> +{
> +       u32 reg;
> +       struct drm_device *dev = encoder->dev;
> +       struct hibmc_drm_device *hidev = dev->dev_private;
> +
> +       /* just open DISPLAY_CONTROL_HISILE register bit 3:0*/
> +       reg = readl(hidev->mmio + DISPLAY_CONTROL_HISILE);
> +       reg |= 0xf;

Can you just pull this into a #define instead of explaining in the comment?

> +       writel(reg, hidev->mmio + DISPLAY_CONTROL_HISILE);
> +}
> +
> +static int hibmc_encoder_atomic_check(struct drm_encoder *encoder,
> +                                     struct drm_crtc_state *crtc_state,
> +                                     struct drm_connector_state *conn_state)
> +{
> +       return 0;
> +}

null-checked, remove stub

> +
> +static const struct drm_encoder_helper_funcs hibmc_encoder_helper_funcs = {
> +       .mode_set = hibmc_encoder_mode_set,
> +       .disable = hibmc_encoder_disable,
> +       .enable = hibmc_encoder_enable,
> +       .atomic_check = hibmc_encoder_atomic_check,
> +};
> +
> +static const struct drm_encoder_funcs hibmc_encoder_encoder_funcs = {
> +       .destroy = drm_encoder_cleanup,
> +};
> +
> +int hibmc_encoder_init(struct hibmc_drm_device *hidev)
> +{
> +       struct drm_device *dev = hidev->dev;
> +       struct drm_encoder *encoder = &hidev->encoder;
> +       int ret;
> +
> +       encoder->possible_crtcs = 0x1;
> +       ret = drm_encoder_init(dev, encoder, &hibmc_encoder_encoder_funcs,
> +                              DRM_MODE_ENCODER_DAC, NULL);
> +       if (ret) {
> +               DRM_ERROR("failed to init encoder\n");

print ret

> +               return ret;
> +       }
> +
> +       drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs);
> +       return 0;
> +}
> --
> 1.9.1
>
>
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