drm/bridge: samsung-dsim: allow configuring bits and offsets of CLKCTRL register

DSIM_CLKCTRL bit and offset values hardcoded in the driver:

name                      | bit/offset value
--------------------------+-----------------
DSIM_LANE_ESC_CLK_EN_CLK  | 19
DSIM_LANE_ESC_CLK_EN_DATA | 20
DSIM_BYTE_CLKEN           | 24
DSIM_ESC_CLKEN            | 28
DSIM_TX_REQUEST_HSCLK     | 31

DSIM_CLKCTRL bit and offset values in Exynos7870 DSIM as per downstream
kernel sources:

name                      | bit/offset value
--------------------------+-----------------
DSIM_LANE_ESC_CLK_EN_CLK  | 8
DSIM_LANE_ESC_CLK_EN_DATA | 9
DSIM_BYTE_CLKEN           | 17
DSIM_ESC_CLKEN            | 16
DSIM_TX_REQUEST_HSCLK     | 20

In order to support both, move all values to the driver data struct and
define it for every driver compatible. Reference the values from there
instead, in functions wherever required.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

2 files changed, 59 insertions, 22 deletions

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index dd6c99dada89..72190787ff13 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -46,17 +46,13 @@
 #define DSIM_BTA_TIMEOUT(x)		((x) << 16)
 
 /* DSIM_CLKCTRL */
-#define DSIM_ESC_PRESCALER(x)		(((x) & 0xffff) << 0)
-#define DSIM_ESC_PRESCALER_MASK		(0xffff << 0)
-#define DSIM_LANE_ESC_CLK_EN_CLK	BIT(19)
-#define DSIM_LANE_ESC_CLK_EN_DATA(x)	(((x) & 0xf) << 20)
-#define DSIM_LANE_ESC_CLK_EN_DATA_MASK	(0xf << 20)
-#define DSIM_BYTE_CLKEN			BIT(24)
-#define DSIM_BYTE_CLK_SRC(x)		(((x) & 0x3) << 25)
-#define DSIM_BYTE_CLK_SRC_MASK		(0x3 << 25)
-#define DSIM_PLL_BYPASS			BIT(27)
-#define DSIM_ESC_CLKEN			BIT(28)
-#define DSIM_TX_REQUEST_HSCLK		BIT(31)
+#define DSIM_ESC_PRESCALER(x)			(((x) & 0xffff) << 0)
+#define DSIM_ESC_PRESCALER_MASK			(0xffff << 0)
+#define DSIM_LANE_ESC_CLK_EN_DATA(x, offset)	(((x) & 0xf) << offset)
+#define DSIM_LANE_ESC_CLK_EN_DATA_MASK(offset)	(0xf << offset)
+#define DSIM_BYTE_CLK_SRC(x)			(((x) & 0x3) << 25)
+#define DSIM_BYTE_CLK_SRC_MASK			(0x3 << 25)
+#define DSIM_PLL_BYPASS				BIT(27)
 
 /* DSIM_CONFIG */
 #define DSIM_LANE_EN_CLK		BIT(0)
@@ -421,6 +417,11 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = {
 	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
+	.esc_clken_bit = 28,
+	.byte_clken_bit = 24,
+	.tx_req_hsclk_bit = 31,
+	.lane_esc_clk_bit = 19,
+	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
 	.reg_values = reg_values,
 	.pll_fin_min = 6,
@@ -442,6 +443,11 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
 	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
+	.esc_clken_bit = 28,
+	.byte_clken_bit = 24,
+	.tx_req_hsclk_bit = 31,
+	.lane_esc_clk_bit = 19,
+	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
 	.reg_values = reg_values,
 	.pll_fin_min = 6,
@@ -461,6 +467,11 @@ static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
 	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
+	.esc_clken_bit = 28,
+	.byte_clken_bit = 24,
+	.tx_req_hsclk_bit = 31,
+	.lane_esc_clk_bit = 19,
+	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
 	.reg_values = reg_values,
 	.pll_fin_min = 6,
@@ -480,6 +491,11 @@ static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
 	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
+	.esc_clken_bit = 28,
+	.byte_clken_bit = 24,
+	.tx_req_hsclk_bit = 31,
+	.lane_esc_clk_bit = 19,
+	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
 	.reg_values = exynos5433_reg_values,
 	.pll_fin_min = 6,
@@ -499,6 +515,11 @@ static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
 	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 12,
+	.esc_clken_bit = 28,
+	.byte_clken_bit = 24,
+	.tx_req_hsclk_bit = 31,
+	.lane_esc_clk_bit = 19,
+	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
 	.reg_values = exynos5422_reg_values,
 	.pll_fin_min = 6,
@@ -518,6 +539,11 @@ static const struct samsung_dsim_driver_data imx8mm_dsi_driver_data = {
 	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
+	.esc_clken_bit = 28,
+	.byte_clken_bit = 24,
+	.tx_req_hsclk_bit = 31,
+	.lane_esc_clk_bit = 19,
+	.lane_esc_data_offset = 20,
 	/*
 	 * Unlike Exynos, PLL_P(PMS_P) offset 14 is used in i.MX8M Mini/Nano/Plus
 	 * downstream driver - drivers/gpu/drm/bridge/sec-dsim.c
@@ -721,6 +747,7 @@ static unsigned long samsung_dsim_set_pll(struct samsung_dsim *dsi,
 
 static int samsung_dsim_enable_clock(struct samsung_dsim *dsi)
 {
+	const struct samsung_dsim_driver_data *driver_data = dsi->driver_data;
 	unsigned long hs_clk, byte_clk, esc_clk, pix_clk;
 	unsigned long esc_div;
 	u32 reg;
@@ -754,15 +781,17 @@ static int samsung_dsim_enable_clock(struct samsung_dsim *dsi)
 		hs_clk, byte_clk, esc_clk);
 
 	reg = samsung_dsim_read(dsi, DSIM_CLKCTRL_REG);
-	reg &= ~(DSIM_ESC_PRESCALER_MASK | DSIM_LANE_ESC_CLK_EN_CLK
-			| DSIM_LANE_ESC_CLK_EN_DATA_MASK | DSIM_PLL_BYPASS
-			| DSIM_BYTE_CLK_SRC_MASK);
-	reg |= DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN
-			| DSIM_ESC_PRESCALER(esc_div)
-			| DSIM_LANE_ESC_CLK_EN_CLK
-			| DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1)
-			| DSIM_BYTE_CLK_SRC(0)
-			| DSIM_TX_REQUEST_HSCLK;
+	reg &= ~(DSIM_ESC_PRESCALER_MASK | BIT(driver_data->lane_esc_clk_bit)
+		| DSIM_LANE_ESC_CLK_EN_DATA_MASK(driver_data->lane_esc_data_offset)
+		| DSIM_PLL_BYPASS
+		| DSIM_BYTE_CLK_SRC_MASK);
+	reg |= BIT(driver_data->esc_clken_bit) | BIT(driver_data->byte_clken_bit)
+		| DSIM_ESC_PRESCALER(esc_div)
+		| BIT(driver_data->lane_esc_clk_bit)
+		| DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1,
+					    driver_data->lane_esc_data_offset)
+		| DSIM_BYTE_CLK_SRC(0)
+		| BIT(driver_data->tx_req_hsclk_bit);
 	samsung_dsim_write(dsi, DSIM_CLKCTRL_REG, reg);
 
 	return 0;
@@ -866,11 +895,14 @@ static void samsung_dsim_set_phy_ctrl(struct samsung_dsim *dsi)
 
 static void samsung_dsim_disable_clock(struct samsung_dsim *dsi)
 {
+	const struct samsung_dsim_driver_data *driver_data = dsi->driver_data;
 	u32 reg;
 
 	reg = samsung_dsim_read(dsi, DSIM_CLKCTRL_REG);
-	reg &= ~(DSIM_LANE_ESC_CLK_EN_CLK | DSIM_LANE_ESC_CLK_EN_DATA_MASK
-			| DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN);
+	reg &= ~(BIT(driver_data->lane_esc_clk_bit)
+		| DSIM_LANE_ESC_CLK_EN_DATA_MASK(driver_data->lane_esc_data_offset)
+		| BIT(driver_data->esc_clken_bit)
+		| BIT(driver_data->byte_clken_bit));
 	samsung_dsim_write(dsi, DSIM_CLKCTRL_REG, reg);
 
 	reg = samsung_dsim_read(dsi, DSIM_PLLCTRL_REG);
diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung-dsim.h
index 62c07952bd00..b1e64c7f9931 100644
--- a/include/drm/bridge/samsung-dsim.h
+++ b/include/drm/bridge/samsung-dsim.h
@@ -64,6 +64,11 @@ struct samsung_dsim_driver_data {
 	unsigned int wait_for_hdr_fifo;
 	unsigned int wait_for_reset;
 	unsigned int num_bits_resol;
+	unsigned int esc_clken_bit;
+	unsigned int byte_clken_bit;
+	unsigned int tx_req_hsclk_bit;
+	unsigned int lane_esc_clk_bit;
+	unsigned int lane_esc_data_offset;
 	unsigned int pll_p_offset;
 	const unsigned int *reg_values;
 	unsigned int pll_fin_min;