drm: bridge: dw-hdmi: Remove PHY configuration resolution parameter

The current code hard codes the call of hdmi_phy_configure() to be 8bpp
and provides extraneous error checking to verify that this hardcoded
value is correct. Simplify the implementation by removing the argument.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170117082910.27023-12-laurent.pinchart+renesas@ideasonboard.com

drivers/gpu/drm/bridge/dw-hdmi.c

@@ -930,31 +930,14 @@ static void dw_hdmi_phy_sel_interface_control(struct dw_hdmi *hdmi, u8 enable)
 			 HDMI_PHY_CONF0_SELDIPIF_MASK);
 }
 
-static int hdmi_phy_configure(struct dw_hdmi *hdmi,
-			      unsigned char res, int cscon)
+static int hdmi_phy_configure(struct dw_hdmi *hdmi, int cscon)
 {
-	unsigned res_idx;
 	u8 val, msec;
 	const struct dw_hdmi_plat_data *pdata = hdmi->plat_data;
 	const struct dw_hdmi_mpll_config *mpll_config = pdata->mpll_cfg;
 	const struct dw_hdmi_curr_ctrl *curr_ctrl = pdata->cur_ctr;
 	const struct dw_hdmi_phy_config *phy_config = pdata->phy_config;
 
-	switch (res) {
-	case 0:	/* color resolution 0 is 8 bit colour depth */
-	case 8:
-		res_idx = DW_HDMI_RES_8;
-		break;
-	case 10:
-		res_idx = DW_HDMI_RES_10;
-		break;
-	case 12:
-		res_idx = DW_HDMI_RES_12;
-		break;
-	default:
-		return -EINVAL;
-	}
-
 	/* PLL/MPLL Cfg - always match on final entry */
 	for (; mpll_config->mpixelclock != ~0UL; mpll_config++)
 		if (hdmi->hdmi_data.video_mode.mpixelclock <=
@@ -1004,11 +987,11 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi,
 		    HDMI_PHY_I2CM_SLAVE_ADDR);
 	hdmi_phy_test_clear(hdmi, 0);
 
-	hdmi_phy_i2c_write(hdmi, mpll_config->res[res_idx].cpce, 0x06);
-	hdmi_phy_i2c_write(hdmi, mpll_config->res[res_idx].gmp, 0x15);
+	hdmi_phy_i2c_write(hdmi, mpll_config->res[0].cpce, 0x06);
+	hdmi_phy_i2c_write(hdmi, mpll_config->res[0].gmp, 0x15);
 
 	/* CURRCTRL */
-	hdmi_phy_i2c_write(hdmi, curr_ctrl->curr[res_idx], 0x10);
+	hdmi_phy_i2c_write(hdmi, curr_ctrl->curr[0], 0x10);
 
 	hdmi_phy_i2c_write(hdmi, 0x0000, 0x13);  /* PLLPHBYCTRL */
 	hdmi_phy_i2c_write(hdmi, 0x0006, 0x17);
@@ -1068,7 +1051,7 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi)
 		dw_hdmi_phy_enable_powerdown(hdmi, true);
 
 		/* Enable CSC */
-		ret = hdmi_phy_configure(hdmi, 8, cscon);
+		ret = hdmi_phy_configure(hdmi, cscon);
 		if (ret)
 			return ret;
 	}