Re: [PATCH 03/11] drm/msm/dsi: correct programming sequence for SM8350 / SM8450

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On 8/3/2024 10:40 PM, Dmitry Baryshkov wrote:
According to the display-drivers, 5nm DSI PLL (v4.2, v4.3) have
different boundaries for pll_clock_inverters programming. Follow the
vendor code and use correct values.

Fixes: 2f9ae4e395ed ("drm/msm/dsi: add support for DSI-PHY on SM8350 and SM8450")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 12 +++++++++++-
  1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
index 3b59137ca674..031446c87dae 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
@@ -135,7 +135,7 @@ static void dsi_pll_calc_dec_frac(struct dsi_pll_7nm *pll, struct dsi_pll_config
  			config->pll_clock_inverters = 0x00;
  		else
  			config->pll_clock_inverters = 0x40;
-	} else {
+	} else if (pll->phy->cfg->quirks & DSI_PHY_7NM_QUIRK_V4_1) {
  		if (pll_freq <= 1000000000ULL)
  			config->pll_clock_inverters = 0xa0;
  		else if (pll_freq <= 2500000000ULL)
@@ -144,6 +144,16 @@ static void dsi_pll_calc_dec_frac(struct dsi_pll_7nm *pll, struct dsi_pll_config
  			config->pll_clock_inverters = 0x00;
  		else
  			config->pll_clock_inverters = 0x40;
+	} else {
+		/* 4.2, 4.3 */
+		if (pll_freq <= 1000000000ULL)
+			config->pll_clock_inverters = 0xa0;
+		else if (pll_freq <= 2500000000ULL)
+			config->pll_clock_inverters = 0x20;
+		else if (pll_freq <= 3500000000ULL)
+			config->pll_clock_inverters = 0x00;
+		else
+			config->pll_clock_inverters = 0x40;
  	}


Sorry for the delay, my request for the docs was first rejected for some reason :)

Now I finally got access and this matches the docs

Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>




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