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[PATCH v4 0/4] RK3399 dw-mipi-dsi patches

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  [PATCH v4 0/4] RK3399 dw-mipi-dsi patches Chris Zhong <zyw@rock-chips.com> - 2017-03-22 03:00 +0100
    [PATCH v4 3/4] drm/rockchip/dsi: enable the grf clk before writing grf registers Chris Zhong <zyw@rock-chips.com> - 2017-03-22 03:00 +0100
    Re: [PATCH v4 0/4] RK3399 dw-mipi-dsi patches Sean Paul <seanpaul@chromium.org> - 2017-03-24 20:40 +0100

#1606142 — [PATCH v4 0/4] RK3399 dw-mipi-dsi patches

Hi all

This series set the phy_cfg_clk to be a required clock for RK3399, and
add a grf clock control in dw-mipi-dsi driver. And then correct a
register name.


Changes in v4:
- remove "additional"
- print the err after clk_prepare_enable(dsi->grf_clk)

Changes in v3:
- add a DW_MIPI_NEEDS_PHY_CFG_CLK for RK3399
- add a DW_MIPI_NEEDS_GRF_CLK for RK3399

Changes in v2:
- check the grf_clk only for RK3399

Chris Zhong (4):
  drm/rockchip/dsi: check phy_cfg_clk only for RK3399
  dt-bindings: add the grf clock for dw-mipi-dsi
  drm/rockchip/dsi: enable the grf clk before writing grf registers
  drm/rockchip/dsi: correct the grf_switch_reg name

 .../display/rockchip/dw_mipi_dsi_rockchip.txt      |  2 +-
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c             | 42 +++++++++++++++++-----
 2 files changed, 35 insertions(+), 9 deletions(-)

-- 
2.6.3

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#1606144 — [PATCH v4 3/4] drm/rockchip/dsi: enable the grf clk before writing grf registers

For RK3399, the grf clk should be enabled before writing grf registers,
otherwise the register value can not be changed.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
---

Changes in v4:
- print the err after clk_prepare_enable(dsi->grf_clk)

Changes in v3:
- add a DW_MIPI_NEEDS_GRF_CLK for RK3399

Changes in v2:
- check the grf_clk only for RK3399

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 68f48b0..dc8fd22 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -252,6 +252,7 @@
 #define THS_ZERO_PROGRAM_EN	BIT(6)
 
 #define DW_MIPI_NEEDS_PHY_CFG_CLK	BIT(0)
+#define DW_MIPI_NEEDS_GRF_CLK		BIT(1)
 
 enum {
 	BANDGAP_97_07,
@@ -294,6 +295,7 @@ struct dw_mipi_dsi {
 	struct regmap *grf_regmap;
 	void __iomem *base;
 
+	struct clk *grf_clk;
 	struct clk *pllref_clk;
 	struct clk *pclk;
 	struct clk *phy_cfg_clk;
@@ -982,6 +984,17 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
 	dw_mipi_dsi_dphy_interface_config(dsi);
 	dw_mipi_dsi_clear_err(dsi);
 
+	/*
+	 * For the RK3399, the clk of grf must be enabled before writing grf
+	 * register. And for RK3288 or other soc, this grf_clk must be NULL,
+	 * the clk_prepare_enable return true directly.
+	 */
+	ret = clk_prepare_enable(dsi->grf_clk);
+	if (ret) {
+		dev_err(dsi->dev, "Failed to enable grf_clk: %d\n", ret);
+		return;
+	}
+
 	if (pdata->grf_dsi0_mode_reg)
 		regmap_write(dsi->grf_regmap, pdata->grf_dsi0_mode_reg,
 			     pdata->grf_dsi0_mode);
@@ -1006,6 +1019,8 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
 	regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
 	dev_dbg(dsi->dev, "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
 	dsi->dpms_mode = DRM_MODE_DPMS_ON;
+
+	clk_disable_unprepare(dsi->grf_clk);
 }
 
 static int
@@ -1139,7 +1154,7 @@ static struct dw_mipi_dsi_plat_data rk3399_mipi_dsi_drv_data = {
 	.grf_switch_reg = RK3399_GRF_SOC_CON19,
 	.grf_dsi0_mode = RK3399_GRF_DSI_MODE,
 	.grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22,
-	.flags = DW_MIPI_NEEDS_PHY_CFG_CLK,
+	.flags = DW_MIPI_NEEDS_PHY_CFG_CLK | DW_MIPI_NEEDS_GRF_CLK,
 	.max_data_lanes = 4,
 };
 
@@ -1240,6 +1255,15 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 		}
 	}
 
+	if (pdata->flags & DW_MIPI_NEEDS_GRF_CLK) {
+		dsi->grf_clk = devm_clk_get(dev, "grf");
+		if (IS_ERR(dsi->grf_clk)) {
+			ret = PTR_ERR(dsi->grf_clk);
+			dev_err(dev, "Unable to get grf_clk: %d\n", ret);
+			return ret;
+		}
+	}
+
 	ret = clk_prepare_enable(dsi->pllref_clk);
 	if (ret) {
 		dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
-- 
2.6.3

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#1608929

On Wed, Mar 22, 2017 at 09:54:47AM +0800, Chris Zhong wrote:
> Hi all
> 
> This series set the phy_cfg_clk to be a required clock for RK3399, and
> add a grf clock control in dw-mipi-dsi driver. And then correct a
> register name.
> 

Applied to drm-misc

Thanks,

Sean


> 
> Changes in v4:
> - remove "additional"
> - print the err after clk_prepare_enable(dsi->grf_clk)
> 
> Changes in v3:
> - add a DW_MIPI_NEEDS_PHY_CFG_CLK for RK3399
> - add a DW_MIPI_NEEDS_GRF_CLK for RK3399
> 
> Changes in v2:
> - check the grf_clk only for RK3399
> 
> Chris Zhong (4):
>   drm/rockchip/dsi: check phy_cfg_clk only for RK3399
>   dt-bindings: add the grf clock for dw-mipi-dsi
>   drm/rockchip/dsi: enable the grf clk before writing grf registers
>   drm/rockchip/dsi: correct the grf_switch_reg name
> 
>  .../display/rockchip/dw_mipi_dsi_rockchip.txt      |  2 +-
>  drivers/gpu/drm/rockchip/dw-mipi-dsi.c             | 42 +++++++++++++++++-----
>  2 files changed, 35 insertions(+), 9 deletions(-)
> 
> -- 
> 2.6.3
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS

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