From: Cristian Ciocaltea cristian.ciocaltea@collabora.com
[ Upstream commit 2c1268e7aad0819f38e56134bbc2095fd95fde1b ]
The RK3588 specific implementation is currently quite limited in terms of handling the full range of display modes supported by the connected screens, e.g. 2560x1440@75Hz, 2048x1152@60Hz, 1024x768@60Hz are just a few of them.
Additionally, it doesn't cope well with non-integer refresh rates like 59.94, 29.97, 23.98, etc.
Make use of HDMI0 PHY PLL as a more accurate DCLK source to handle all display modes up to 4K@60Hz.
Tested-by: FUKAUMI Naoki naoki@radxa.com Signed-off-by: Cristian Ciocaltea cristian.ciocaltea@collabora.com Signed-off-by: Heiko Stuebner heiko@sntech.de Link: https://patchwork.freedesktop.org/patch/msgid/20250204-vop2-hdmi0-disp-modes... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 34 ++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c index 64029237358d8..bcbd498823928 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c @@ -159,6 +159,7 @@ struct vop2_video_port { struct drm_crtc crtc; struct vop2 *vop2; struct clk *dclk; + struct clk *dclk_src; unsigned int id; const struct vop2_video_port_data *data;
@@ -214,6 +215,7 @@ struct vop2 { struct clk *hclk; struct clk *aclk; struct clk *pclk; + struct clk *pll_hdmiphy0;
/* optional internal rgb encoder */ struct rockchip_rgb *rgb; @@ -222,6 +224,8 @@ struct vop2 { struct vop2_win win[]; };
+#define VOP2_MAX_DCLK_RATE 600000000 + #define vop2_output_if_is_hdmi(x) ((x) == ROCKCHIP_VOP2_EP_HDMI0 || \ (x) == ROCKCHIP_VOP2_EP_HDMI1)
@@ -1155,6 +1159,9 @@ static void vop2_crtc_atomic_disable(struct drm_crtc *crtc,
vop2_crtc_disable_irq(vp, VP_INT_DSP_HOLD_VALID);
+ if (vp->dclk_src) + clk_set_parent(vp->dclk, vp->dclk_src); + clk_disable_unprepare(vp->dclk);
vop2->enable_count--; @@ -2257,6 +2264,27 @@ static void vop2_crtc_atomic_enable(struct drm_crtc *crtc,
vop2_vp_write(vp, RK3568_VP_MIPI_CTRL, 0);
+ /* + * Switch to HDMI PHY PLL as DCLK source for display modes up + * to 4K@60Hz, if available, otherwise keep using the system CRU. + */ + if (vop2->pll_hdmiphy0 && clock <= VOP2_MAX_DCLK_RATE) { + drm_for_each_encoder_mask(encoder, crtc->dev, crtc_state->encoder_mask) { + struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder); + + if (rkencoder->crtc_endpoint_id == ROCKCHIP_VOP2_EP_HDMI0) { + if (!vp->dclk_src) + vp->dclk_src = clk_get_parent(vp->dclk); + + ret = clk_set_parent(vp->dclk, vop2->pll_hdmiphy0); + if (ret < 0) + drm_warn(vop2->drm, + "Could not switch to HDMI0 PHY PLL: %d\n", ret); + break; + } + } + } + clk_set_rate(vp->dclk, clock);
vop2_post_config(crtc); @@ -3697,6 +3725,12 @@ static int vop2_bind(struct device *dev, struct device *master, void *data) return PTR_ERR(vop2->pclk); }
+ vop2->pll_hdmiphy0 = devm_clk_get_optional(vop2->dev, "pll_hdmiphy0"); + if (IS_ERR(vop2->pll_hdmiphy0)) { + drm_err(vop2->drm, "failed to get pll_hdmiphy0\n"); + return PTR_ERR(vop2->pll_hdmiphy0); + } + vop2->irq = platform_get_irq(pdev, 0); if (vop2->irq < 0) { drm_err(vop2->drm, "cannot find irq for vop2\n");