linux-kernel - Re: [PATCH v2 3/4] drm/tinydrm: export mipi_dbi_buf_copy and mipi_dbi_spi_cmd_max

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Date:   Wed, 22 Nov 2017 15:21:52 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     David Lechner <david@...hnology.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] drm/tinydrm: export mipi_dbi_buf_copy and
 mipi_dbi_spi_cmd_max_speed


Den 19.11.2017 21.12, skrev David Lechner:
> This exports the mipi_dbi_buf_copy() and mipi_dbi_spi_cmd_max_speed()
> functions so that they can be shared with other drivers.
>
> Signed-off-by: David Lechner <david@...hnology.com>
> ---

Reviewed-by: Noralf Trønnes <noralf@...nnes.org>

> v2 changes:
> * new patch in v2
>
>   drivers/gpu/drm/tinydrm/mipi-dbi.c | 24 ++++++++++++++++++++----
>   include/drm/tinydrm/mipi-dbi.h     |  4 +++-
>   2 files changed, 23 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> index 347f9b2..aa6b6ce 100644
> --- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
> +++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> @@ -154,8 +154,18 @@ int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len)
>   }
>   EXPORT_SYMBOL(mipi_dbi_command_buf);
>   
> -static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
> -				struct drm_clip_rect *clip, bool swap)
> +/**
> + * mipi_dbi_buf_copy - Copy a framebuffer, transforming it if necessary
> + * @dst: The destination buffer
> + * @fb: The source framebuffer
> + * @clip: Clipping rectangle of the area to be copied
> + * @swap: When true, swap MSB/LSB of 16-bit values
> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
> +		      struct drm_clip_rect *clip, bool swap)
>   {
>   	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
>   	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
> @@ -192,6 +202,7 @@ static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
>   					     DMA_FROM_DEVICE);
>   	return ret;
>   }
> +EXPORT_SYMBOL(mipi_dbi_buf_copy);
>   
>   static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
>   			     struct drm_file *file_priv,
> @@ -444,18 +455,23 @@ EXPORT_SYMBOL(mipi_dbi_display_is_on);
>   
>   #if IS_ENABLED(CONFIG_SPI)
>   
> -/*
> +/**
> + * mipi_dbi_spi_cmd_max_speed - get the maximum SPI bus speed
> + * @spi: SPI device
> + * @len: The transfer buffer length.
> + *
>    * Many controllers have a max speed of 10MHz, but can be pushed way beyond
>    * that. Increase reliability by running pixel data at max speed and the rest
>    * at 10MHz, preventing transfer glitches from messing up the init settings.
>    */
> -static u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)
> +u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)
>   {
>   	if (len > 64)
>   		return 0; /* use default */
>   
>   	return min_t(u32, 10000000, spi->max_speed_hz);
>   }
> +EXPORT_SYMBOL(mipi_dbi_spi_cmd_max_speed);
>   
>   /*
>    * MIPI DBI Type C Option 1
> diff --git a/include/drm/tinydrm/mipi-dbi.h b/include/drm/tinydrm/mipi-dbi.h
> index 83346dd..5d0e82b 100644
> --- a/include/drm/tinydrm/mipi-dbi.h
> +++ b/include/drm/tinydrm/mipi-dbi.h
> @@ -72,10 +72,12 @@ void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
>   void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
>   void mipi_dbi_hw_reset(struct mipi_dbi *mipi);
>   bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);
> +u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
>   
>   int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val);
>   int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);
> -
> +int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
> +		      struct drm_clip_rect *clip, bool swap);
>   /**
>    * mipi_dbi_command - MIPI DCS command with optional parameter(s)
>    * @mipi: MIPI structure