5.4-stable review patch. If anyone has any objections, please let me know.
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From: Harikrishna Shenoy h-shenoy@ti.com
[ Upstream commit 43bd2c44515f8ee5c019ce6e6583f5640387a41b ]
Enable support for data lane rates between 80-160 Mbps cdns dphy as mentioned in TRM [0] by setting the pll_opdiv field to 16. This change enables lower resolutions like 640x480 at 60Hz.
[0]: https://www.ti.com/lit/zip/spruil1 (Table 12-552. DPHY_TX_PLL_CTRL Register Field Descriptions)
Reviewed-by: Udit Kumar u-kumar1@ti.com Reviewed-by: Devarsh Thakkar devarsht@ti.com Signed-off-by: Harikrishna Shenoy h-shenoy@ti.com Link: https://lore.kernel.org/r/20250807052002.717807-1-h-shenoy@ti.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/phy/cadence/cdns-dphy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/phy/cadence/cdns-dphy.c b/drivers/phy/cadence/cdns-dphy.c index 90c4e9b5aac83..04cee5a00a5b4 100644 --- a/drivers/phy/cadence/cdns-dphy.c +++ b/drivers/phy/cadence/cdns-dphy.c @@ -115,7 +115,7 @@ static int cdns_dsi_get_dphy_pll_cfg(struct cdns_dphy *dphy,
dlane_bps = opts->hs_clk_rate;
- if (dlane_bps > 2500000000UL || dlane_bps < 160000000UL) + if (dlane_bps > 2500000000UL || dlane_bps < 80000000UL) return -EINVAL; else if (dlane_bps >= 1250000000) cfg->pll_opdiv = 1; @@ -125,6 +125,8 @@ static int cdns_dsi_get_dphy_pll_cfg(struct cdns_dphy *dphy, cfg->pll_opdiv = 4; else if (dlane_bps >= 160000000) cfg->pll_opdiv = 8; + else if (dlane_bps >= 80000000) + cfg->pll_opdiv = 16;
cfg->pll_fbdiv = DIV_ROUND_UP_ULL(dlane_bps * 2 * cfg->pll_opdiv * cfg->pll_ipdiv,