[PATCH 58/59] drm/kmb: Get System Clock from SCMI

[Anitha Chrisanthus <anitha.chrisanthus@intel.com>]

System clock is different for A0 and B0 silicons, so get it directly
from clk_PLL0 through SCMI calls.

Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus@intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
---
 drivers/gpu/drm/kmb/kmb_drv.c | 11 +++++++++++
 drivers/gpu/drm/kmb/kmb_drv.h |  1 +
 drivers/gpu/drm/kmb/kmb_dsi.c | 12 +-----------
 3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index bafc02a..74f57b3 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -59,6 +59,7 @@ static struct clk *clk_lcd;
 static struct clk *clk_mipi;
 static struct clk *clk_mipi_ecfg;
 static struct clk *clk_mipi_cfg;
+static struct clk *clk_pll0;
 
 struct drm_bridge *adv_bridge;
 
@@ -144,6 +145,7 @@ static int kmb_load(struct drm_device *drm, unsigned long flags)
 #ifdef ICAM_LCD_QOS
 	int val = 0;
 #endif
+	struct device_node *vpu_dev;
 
 	/* Map MIPI MMIO registers */
 	dev_p->mipi_mmio = kmb_map_mmio(pdev, "mipi_regs");
@@ -210,6 +212,15 @@ static int kmb_load(struct drm_device *drm, unsigned long flags)
 		DRM_ERROR("clk_get() failed clk_mipi_cfg\n");
 		goto setup_fail;
 	}
+	vpu_dev = of_find_node_by_path("/soc/vpu-ipc");
+	DRM_INFO("vpu node = %pOF", vpu_dev);
+	clk_pll0 = of_clk_get_by_name(vpu_dev, "pll_0_out_0");
+	if (IS_ERR(clk_pll0)) {
+		DRM_ERROR("clk_get() failed clk_pll0 ");
+		goto setup_fail;
+	}
+	dev_p->sys_clk_mhz = clk_get_rate(clk_pll0)/1000000;
+	DRM_INFO("system clk = %d Mhz", dev_p->sys_clk_mhz);
 #ifdef LCD_TEST
 	/* Set LCD clock to 200 Mhz */
 	DRM_DEBUG("Get clk_lcd before set = %ld\n", clk_get_rate(clk_lcd));
diff --git a/drivers/gpu/drm/kmb/kmb_drv.h b/drivers/gpu/drm/kmb/kmb_drv.h
index a066aba..35872a5 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.h
+++ b/drivers/gpu/drm/kmb/kmb_drv.h
@@ -58,6 +58,7 @@ struct kmb_drm_private {
 	spinlock_t			irq_lock;
 	int				irq_lcd;
 	int				irq_mipi;
+	int				sys_clk_mhz;
 	dma_addr_t			fb_addr;
 };
 
diff --git a/drivers/gpu/drm/kmb/kmb_dsi.c b/drivers/gpu/drm/kmb/kmb_dsi.c
index ec974da..81678a3 100644
--- a/drivers/gpu/drm/kmb/kmb_dsi.c
+++ b/drivers/gpu/drm/kmb/kmb_dsi.c
@@ -611,20 +611,10 @@ static void mipi_tx_fg_cfg_regs(struct kmb_drm_private *dev_p, u8 frame_gen,
 	u32 ppl_llp_ratio;
 	u32 ctrl_no = MIPI_CTRL6, reg_adr, val, offset;
 
-#ifdef GET_SYS_CLK
-	/* Get system clock for blanking period cnfigurations */
-	sc = get_clock_frequency(CPR_CLK_SYSTEM, &sysclk);
-	if (sc)
-		return sc;
-
-	/* Convert to MHZ */
-	sysclk /= 1000;
-#else
 	/* 500 Mhz system clock minus 50 to account for the difference in
 	 * MIPI clock speed in RTL tests
 	 */
-	sysclk = KMB_SYS_CLK_MHZ - 50;
-#endif
+	sysclk = dev_p->sys_clk_mhz - 50;
 
 	/* PPL-Pixel Packing Layer, LLP-Low Level Protocol
 	 * Frame genartor timing parameters are clocked on the system clock,
-- 
2.7.4

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