Re: [PATCH 06/23] drm/sun4i: tcon: Don't rely on encoders to set the TCON mode

From: Chen-Yu Tsai
Date: Tue Oct 17 2017 - 05:57:18 EST

On Tue, Oct 17, 2017 at 5:06 PM, Maxime Ripard
<maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote:
> Just like we did for the TCON enable and disable, for historical reasons we
> used to rely on the encoders calling the TCON mode_set function, while the
> CRTC has a callback for that.
>
> Let's implement it in order to reduce the boilerplate code.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/sun4i/sun4i_crtc.c | 10 +++++++-
> drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c | 1 +-
> drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 7 +-----
> drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c | 1 +-
> drivers/gpu/drm/sun4i/sun4i_rgb.c | 15 +-----------
> drivers/gpu/drm/sun4i/sun4i_tcon.c | 31 +++++++++++++++++-----
> drivers/gpu/drm/sun4i/sun4i_tcon.h | 11 ++------
> drivers/gpu/drm/sun4i/sun4i_tv.c | 6 +----
> 8 files changed, 37 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
> index e86baa3746af..5decae0069d0 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
> @@ -115,11 +115,21 @@ static void sun4i_crtc_atomic_enable(struct drm_crtc *crtc,
> sun4i_tcon_set_status(scrtc->tcon, encoder, true);
> }
>
> +static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc)
> +{
> + struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> + struct drm_encoder *encoder = sun4i_crtc_get_encoder(crtc);
> + struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
> +
> + sun4i_tcon_mode_set(scrtc->tcon, encoder, mode);
> +}
> +
> static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
> .atomic_begin = sun4i_crtc_atomic_begin,
> .atomic_flush = sun4i_crtc_atomic_flush,
> .atomic_enable = sun4i_crtc_atomic_enable,
> .atomic_disable = sun4i_crtc_atomic_disable,
> + .mode_set_nofb = sun4i_crtc_mode_set_nofb,
> };
>
> static int sun4i_crtc_enable_vblank(struct drm_crtc *crtc)
> diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c
> index 04f85b1cf922..e826da34e919 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c
> @@ -13,7 +13,6 @@
> #include <linux/clk-provider.h>
> #include <linux/regmap.h>
>
> -#include "sun4i_tcon.h"
> #include "sun4i_hdmi.h"
>
> struct sun4i_ddc {
> diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
> index 482bf03d55c1..d2eb0a60e568 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
> @@ -30,7 +30,6 @@
> #include "sun4i_crtc.h"
> #include "sun4i_drv.h"
> #include "sun4i_hdmi.h"
> -#include "sun4i_tcon.h"
>
> static inline struct sun4i_hdmi *
> drm_encoder_to_sun4i_hdmi(struct drm_encoder *encoder)
> @@ -120,15 +119,9 @@ static void sun4i_hdmi_mode_set(struct drm_encoder *encoder,
> struct drm_display_mode *adjusted_mode)
> {
> struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
> - struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
> - struct sun4i_tcon *tcon = crtc->tcon;
> unsigned int x, y;
> u32 val;
>
> - sun4i_tcon1_mode_set(tcon, mode);
> - sun4i_tcon_set_mux(tcon, 1, encoder);
> -
> - clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
> clk_set_rate(hdmi->mod_clk, mode->crtc_clock * 1000);
> clk_set_rate(hdmi->tmds_clk, mode->crtc_clock * 1000);
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> index 1b6b37aefc38..dc332ea56f6c 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> @@ -12,7 +12,6 @@
>
> #include <linux/clk-provider.h>
>
> -#include "sun4i_tcon.h"
> #include "sun4i_hdmi.h"
>
> struct sun4i_tmds {
> diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> index a7f297ed40c1..832f8f9bc47f 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> @@ -153,22 +153,7 @@ static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
> }
> }
>
> -static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
> - struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode)
> -{
> - struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
> - struct sun4i_tcon *tcon = rgb->tcon;
> -
> - sun4i_tcon0_mode_set(tcon, mode);
> - sun4i_tcon_set_mux(tcon, 0, encoder);
> -
> - /* FIXME: This seems to be board specific */
> - clk_set_phase(tcon->dclk, 120);
> -}
> -
> static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
> - .mode_set = sun4i_rgb_encoder_mode_set,
> .disable = sun4i_rgb_encoder_disable,
> .enable = sun4i_rgb_encoder_enable,
> };
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> index 964cf22a1ced..7ecd4f7c8411 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -139,7 +139,6 @@ void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
> DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n",
> encoder->name, encoder->crtc->name, ret);
> }
> -EXPORT_SYMBOL(sun4i_tcon_set_mux);
>
> static int sun4i_tcon_get_clk_delay(const struct drm_display_mode *mode,
> int channel)
> @@ -159,8 +158,8 @@ static int sun4i_tcon_get_clk_delay(const struct drm_display_mode *mode,
> return delay;
> }
>
> -void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
> - struct drm_display_mode *mode)
> +static void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
> + struct drm_display_mode *mode)

This doesn't have const...

> {
> unsigned int bp, hsync, vsync;
> u8 clk_delay;
> @@ -233,10 +232,9 @@ void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
> /* Enable the output on the pins */
> regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0);
> }
> -EXPORT_SYMBOL(sun4i_tcon0_mode_set);
>
> -void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
> - struct drm_display_mode *mode)
> +static void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
> + const struct drm_display_mode *mode)
> {
> unsigned int bp, hsync, vsync, vtotal;
> u8 clk_delay;
> @@ -324,7 +322,26 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
> SUN4I_TCON_GCTL_IOMAP_MASK,
> SUN4I_TCON_GCTL_IOMAP_TCON1);
> }
> -EXPORT_SYMBOL(sun4i_tcon1_mode_set);
> +
> +void sun4i_tcon_mode_set(struct sun4i_tcon *tcon,
> + const struct drm_encoder *encoder,
> + const struct drm_display_mode *mode)

But this does...

> +{
> + switch (encoder->encoder_type) {
> + case DRM_MODE_ENCODER_NONE:
> + sun4i_tcon0_mode_set(tcon, mode);

So you're likely to get some warning about dropping const here.

Otherwise,

Reviewed-by: Chen-Yu Tsai <wens@xxxxxxxx>