Hi Chanho,
2016년 01월 30일 22:58에 Chanho Park 이(가) 쓴 글:
> From: Chanho Park <chanho61.park@xxxxxxxxxxx>
>
> This patch adds a mic_bypass option to bypass the mic
> from display out path. The mic(Mobile image compressor) compresses
> RGB data from fimd and send the compressed data to the mipi dsi.
> The bypass option can be founded from system register and the bit
> of the option is 11.
>
> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
> Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
> Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
> Signed-off-by: Chanho Park <chanho61.park@xxxxxxxxxxx>
> ---
> .../devicetree/bindings/display/exynos/samsung-fimd.txt | 2 ++
> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 14 ++++++++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/display/exynos/samsung-fimd.txt b/Documentation/devicetree/bindings/display/exynos/samsung-fimd.txt
> index 27c3ce0..7f90c4a 100644
> --- a/Documentation/devicetree/bindings/display/exynos/samsung-fimd.txt
> +++ b/Documentation/devicetree/bindings/display/exynos/samsung-fimd.txt
> @@ -45,6 +45,8 @@ Optional Properties:
> Can be used in case timings cannot be provided otherwise
> or to override timings provided by the panel.
> - samsung,sysreg: handle to syscon used to control the system registers
> +- samsung,mic-bypass: bypass mic(mobile image compressor) from display path.
> + This option is only available since exynos5420.
> - i80-if-timings: timing configuration for lcd i80 interface support.
> - cs-setup: clock cycles for the active period of address signal is enabled
> until chip select is enabled.
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> index 70194d0..4fb2952 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -94,6 +94,7 @@ struct fimd_driver_data {
> unsigned int lcdblk_offset;
> unsigned int lcdblk_vt_shift;
> unsigned int lcdblk_bypass_shift;
> + unsigned int lcdblk_mic_bypass_shift;
>
> unsigned int has_shadowcon:1;
> unsigned int has_clksel:1;
> @@ -140,6 +141,7 @@ static struct fimd_driver_data exynos5_fimd_driver_data = {
> .lcdblk_offset = 0x214,
> .lcdblk_vt_shift = 24,
> .lcdblk_bypass_shift = 15,
> + .lcdblk_mic_bypass_shift = 11,
> .has_shadowcon = 1,
> .has_vidoutcon = 1,
> .has_vtsel = 1,
> @@ -162,6 +164,7 @@ struct fimd_context {
> u32 i80ifcon;
> bool i80_if;
> bool suspended;
> + bool mic_bypass;
> int pipe;
> wait_queue_head_t wait_vsync_queue;
> atomic_t wait_vsync_event;
> @@ -461,6 +464,14 @@ static void fimd_commit(struct exynos_drm_crtc *crtc)
> return;
> }
>
> + if (ctx->mic_bypass && ctx->sysreg && regmap_update_bits(ctx->sysreg,
> + driver_data->lcdblk_offset,
> + 0x1 << driver_data->lcdblk_mic_bypass_shift,
> + 0x1 << driver_data->lcdblk_mic_bypass_shift)) {
> + DRM_ERROR("Failed to update sysreg for bypass mic.\n");
> + return;
> + }
It'd better to consider mic path also because mic bypass bit of lcdblk could be true by bootloader. In this case, fimd driver wouldn't do anything if mic_bypass property isn't declared but the mic_bypass bit of lcdblk register is still set to 1.
For this, I think you could check lcdblk_mic_pypass_shift to identify whether mic path is supported or not like below,
if (ctx->lcdblk_mic_bypass_shift) {
if (ctx->sysreg && regmap_update_bits(ctx->sysreg,
driver_data->lcdblk_offset,
ctx->mic_bypass << driver_data->lcdblk_mic_bypass_shift,
ctx->mic_bypass << driver_data->lcdblk_mic_bypass_shift)) {
...
}
}
Thanks,
Inki Dae
> +
> /* setup horizontal and vertical display size. */
> val = VIDTCON2_LINEVAL(mode->vdisplay - 1) |
> VIDTCON2_HOZVAL(mode->hdisplay - 1) |
> @@ -1014,6 +1025,9 @@ static int fimd_probe(struct platform_device *pdev)
> if (of_property_read_bool(dev->of_node, "samsung,invert-vclk"))
> ctx->vidcon1 |= VIDCON1_INV_VCLK;
>
> + if (of_property_read_bool(dev->of_node, "samsung,mic-bypass"))
> + ctx->mic_bypass = true;
> +
> i80_if_timings = of_get_child_by_name(dev->of_node, "i80-if-timings");
> if (i80_if_timings) {
> u32 val;
>
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