Re: [RFC PATCH 16/17] drm: bridge: samsung-dsim: Fix PLL_P offset
From: Sam Ravnborg <hidden>
Date: 2021-07-25 17:50:23
Also in:
dri-devel
Hi Jagan, On Sun, Jul 04, 2021 at 02:32:29PM +0530, Jagan Teki wrote:
PMS_P offset value in existing driver is not compatible with i.MX8MM. However the i.MX8M Mini Application Reference manual shows the PMS_P offset is the same in the driver, but the i.MX8MM downstream driver uses a different one. So, handle the PMS_P offset via driver_data and use the offset value for i.MX8MM from the downstream driver. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
$subject and code speaks of PLL but the changelog says PMS. I think the changelog needs a small update here. Sam
quoted hunk ↗ jump to hunk
--- drivers/gpu/drm/bridge/samsung-dsim.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index 54767cbf231c..0ed218f5eefc 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c@@ -184,7 +184,7 @@ /* DSIM_PLLCTRL */ #define DSIM_FREQ_BAND(x) ((x) << 24) #define DSIM_PLL_EN (1 << 23) -#define DSIM_PLL_P(x) ((x) << 13) +#define DSIM_PLL_P(x, offset) ((x) << (offset)) #define DSIM_PLL_M(x) ((x) << 4) #define DSIM_PLL_S(x) ((x) << 1)@@ -259,6 +259,7 @@ struct samsung_dsim_driver_data { unsigned int max_freq; unsigned int wait_for_reset; unsigned int num_bits_resol; + unsigned int pll_p_offset; const unsigned int *reg_values; bool exynos_specific; };@@ -487,6 +488,7 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = { .max_freq = 1000, .wait_for_reset = 1, .num_bits_resol = 11, + .pll_p_offset = 13, .reg_values = reg_values, .exynos_specific = true, };@@ -500,6 +502,7 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = { .max_freq = 1000, .wait_for_reset = 1, .num_bits_resol = 11, + .pll_p_offset = 13, .reg_values = reg_values, .exynos_specific = true, };@@ -511,6 +514,7 @@ static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = { .max_freq = 1000, .wait_for_reset = 1, .num_bits_resol = 11, + .pll_p_offset = 13, .reg_values = reg_values, .exynos_specific = true, };@@ -523,6 +527,7 @@ static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = { .max_freq = 1500, .wait_for_reset = 0, .num_bits_resol = 12, + .pll_p_offset = 13, .reg_values = exynos5433_reg_values, .exynos_specific = true, };@@ -535,6 +540,7 @@ static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = { .max_freq = 1500, .wait_for_reset = 1, .num_bits_resol = 12, + .pll_p_offset = 13, .reg_values = exynos5422_reg_values, .exynos_specific = true, };@@ -547,6 +553,7 @@ static const struct samsung_dsim_driver_data imx8mm_dsi_driver_data = { .max_freq = 2100, .wait_for_reset = 0, .num_bits_resol = 12, + .pll_p_offset = 14, .reg_values = imx8mm_dsim_reg_values, };@@ -662,7 +669,8 @@ 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) | DSIM_PLL_M(m) | DSIM_PLL_S(s); + reg = DSIM_PLL_EN | DSIM_PLL_P(p, driver_data->pll_p_offset) | + DSIM_PLL_M(m) | DSIM_PLL_S(s); if (driver_data->has_freqband) { static const unsigned long freq_bands[] = {-- 2.25.1
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