drm/bridge: samsung-dsim: allow configuring the PLL_STABLE bit

The PLL_STABLE bit of DSIM_DPHY_STATUS is hardcoded to BIT(31), but
Exynos7870's DSIM has it in BIT(24) as per downstream kernel sources.

In order to support both, move this bit value to the driver data struct
and define it for every driver compatible. Reference the value 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

@@ -35,7 +35,6 @@
 #define DSIM_STOP_STATE_DAT(x)		(((x) & 0xf) << 0)
 #define DSIM_STOP_STATE_CLK		BIT(8)
 #define DSIM_TX_READY_HS_CLK		BIT(10)
-#define DSIM_PLL_STABLE			BIT(31)
 
 /* DSIM_SWRST */
 #define DSIM_FUNCRST			BIT(16)
@@ -415,6 +414,7 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.video_mode_bit = 25,
+	.pll_stable_bit = 31,
 	.esc_clken_bit = 28,
 	.byte_clken_bit = 24,
 	.tx_req_hsclk_bit = 31,
@@ -445,6 +445,7 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.video_mode_bit = 25,
+	.pll_stable_bit = 31,
 	.esc_clken_bit = 28,
 	.byte_clken_bit = 24,
 	.tx_req_hsclk_bit = 31,
@@ -473,6 +474,7 @@ static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.video_mode_bit = 25,
+	.pll_stable_bit = 31,
 	.esc_clken_bit = 28,
 	.byte_clken_bit = 24,
 	.tx_req_hsclk_bit = 31,
@@ -501,6 +503,7 @@ static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
 	.video_mode_bit = 25,
+	.pll_stable_bit = 31,
 	.esc_clken_bit = 28,
 	.byte_clken_bit = 24,
 	.tx_req_hsclk_bit = 31,
@@ -529,6 +532,7 @@ static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
 	.wait_for_reset = 1,
 	.num_bits_resol = 12,
 	.video_mode_bit = 25,
+	.pll_stable_bit = 31,
 	.esc_clken_bit = 28,
 	.byte_clken_bit = 24,
 	.tx_req_hsclk_bit = 31,
@@ -557,6 +561,7 @@ static const struct samsung_dsim_driver_data imx8mm_dsi_driver_data = {
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
 	.video_mode_bit = 25,
+	.pll_stable_bit = 31,
 	.esc_clken_bit = 28,
 	.byte_clken_bit = 24,
 	.tx_req_hsclk_bit = 31,
@@ -760,7 +765,7 @@ static unsigned long samsung_dsim_set_pll(struct samsung_dsim *dsi,
 			reg = samsung_dsim_read(dsi, DSIM_STATUS_REG);
 		else
 			reg = samsung_dsim_read(dsi, DSIM_LINK_STATUS_REG);
-	} while ((reg & DSIM_PLL_STABLE) == 0);
+	} while ((reg & BIT(driver_data->pll_stable_bit)) == 0);
 
 	dsi->hs_clock = fout;
 

include/drm/bridge/samsung-dsim.h

@@ -65,6 +65,7 @@ struct samsung_dsim_driver_data {
 	unsigned int wait_for_reset;
 	unsigned int num_bits_resol;
 	unsigned int video_mode_bit;
+	unsigned int pll_stable_bit;
 	unsigned int esc_clken_bit;
 	unsigned int byte_clken_bit;
 	unsigned int tx_req_hsclk_bit;