drm/bridge: samsung-dsim: allow configuring PLL_M and PLL_S offsets

Currently, PLL_P offset of DSIM_PLLCTRL is configurable in the driver
data, while PLL_M and PLL_S offsets are hardcoded as 4-bit and 1-bit
offsets respectively, but Exynos7870's DSIM have them at 3-bit and 0-bit
offsets as per downstream kernel sources.

In order to support both, move both offset 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>

Author: Kaustabh Chakraborty

drivers/gpu/drm/bridge/samsung-dsim.c

@@ -191,9 +191,7 @@
 #define DSIM_PLL_DPDNSWAP_DAT		(1 << 24)
 #define DSIM_FREQ_BAND(x)		((x) << 24)
 #define DSIM_PLL_EN			BIT(23)
-#define DSIM_PLL_P(x, offset)		((x) << (offset))
-#define DSIM_PLL_M(x)			((x) << 4)
-#define DSIM_PLL_S(x)			((x) << 1)
+#define DSIM_PLL(x, offset)		((x) << (offset))
 
 /* DSIM_PHYCTRL */
 #define DSIM_PHYCTRL_ULPS_EXIT(x)	(((x) & 0x1ff) << 0)
@@ -423,6 +421,8 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = {
 	.lane_esc_clk_bit = 19,
 	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
+	.pll_m_offset = 4,
+	.pll_s_offset = 1,
 	.main_vsa_offset = 22,
 	.reg_values = reg_values,
 	.pll_fin_min = 6,
@@ -451,6 +451,8 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
 	.lane_esc_clk_bit = 19,
 	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
+	.pll_m_offset = 4,
+	.pll_s_offset = 1,
 	.main_vsa_offset = 22,
 	.reg_values = reg_values,
 	.pll_fin_min = 6,
@@ -477,6 +479,8 @@ static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
 	.lane_esc_clk_bit = 19,
 	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
+	.pll_m_offset = 4,
+	.pll_s_offset = 1,
 	.main_vsa_offset = 22,
 	.reg_values = reg_values,
 	.pll_fin_min = 6,
@@ -503,6 +507,8 @@ static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
 	.lane_esc_clk_bit = 19,
 	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
+	.pll_m_offset = 4,
+	.pll_s_offset = 1,
 	.main_vsa_offset = 22,
 	.reg_values = exynos5433_reg_values,
 	.pll_fin_min = 6,
@@ -529,6 +535,8 @@ static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
 	.lane_esc_clk_bit = 19,
 	.lane_esc_data_offset = 20,
 	.pll_p_offset = 13,
+	.pll_m_offset = 4,
+	.pll_s_offset = 1,
 	.main_vsa_offset = 22,
 	.reg_values = exynos5422_reg_values,
 	.pll_fin_min = 6,
@@ -559,6 +567,8 @@ static const struct samsung_dsim_driver_data imx8mm_dsi_driver_data = {
 	 * downstream driver - drivers/gpu/drm/bridge/sec-dsim.c
 	 */
 	.pll_p_offset = 14,
+	.pll_m_offset = 4,
+	.pll_s_offset = 1,
 	.main_vsa_offset = 22,
 	.reg_values = imx8mm_dsim_reg_values,
 	.pll_fin_min = 2,
@@ -710,8 +720,9 @@ static unsigned long samsung_dsim_set_pll(struct samsung_dsim *dsi,
 	writel(driver_data->reg_values[PLL_TIMER],
 	       dsi->reg_base + driver_data->plltmr_reg);
 
-	reg = DSIM_PLL_EN | DSIM_PLL_P(p, driver_data->pll_p_offset) |
-	      DSIM_PLL_M(m) | DSIM_PLL_S(s);
+	reg = DSIM_PLL_EN | DSIM_PLL(p, driver_data->pll_p_offset)
+			  | DSIM_PLL(m, driver_data->pll_m_offset)
+			  | DSIM_PLL(s, driver_data->pll_s_offset);
 
 	if (driver_data->has_freqband) {
 		static const unsigned long freq_bands[] = {

include/drm/bridge/samsung-dsim.h

@@ -71,6 +71,8 @@ struct samsung_dsim_driver_data {
 	unsigned int lane_esc_clk_bit;
 	unsigned int lane_esc_data_offset;
 	unsigned int pll_p_offset;
+	unsigned int pll_m_offset;
+	unsigned int pll_s_offset;
 	unsigned int main_vsa_offset;
 	const unsigned int *reg_values;
 	unsigned int pll_fin_min;