Commit 43bd2c44 authored by Harikrishna Shenoy's avatar Harikrishna Shenoy Committed by Vinod Koul
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phy: cadence: cdns-dphy: Enable lower resolutions in dphy 

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: default avatarUdit Kumar <u-kumar1@ti.com>
Reviewed-by: default avatarDevarsh Thakkar <devarsht@ti.com>
Signed-off-by: default avatarHarikrishna Shenoy <h-shenoy@ti.com>
Link: https://lore.kernel.org/r/20250807052002.717807-1-h-shenoy@ti.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent e4a8db93

drivers/phy/cadence/cdns-dphy.c

+3 −1
Original line number Diff line number Diff line
@@ -136,7 +136,7 @@ static int cdns_dphy_get_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;
@@ -146,6 +146,8 @@ static int cdns_dphy_get_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,