[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20250806052650.429767-1-h-shenoy@ti.com>
Date: Wed, 6 Aug 2025 10:56:50 +0530
From: Harikrishna Shenoy <h-shenoy@...com>
To: <vkoul@...nel.org>, <kishon@...nel.org>, <u.kleine-koenig@...libre.com>,
<linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<devarsht@...com>, <u-kumar1@...com>, <s-jain1@...com>
CC: <h-shenoy@...com>
Subject: [PATCH v2] drivers: phy: cadence: cdns-dphy: Enable lower resolutions in dphy
Enable support for hs_clk_rate 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@...com>
Signed-off-by: Harikrishna Shenoy <h-shenoy@...com>
---
Changes in v2:
- Updated commit message and title.
- Added Reviewed-by tag.
- Link to v1: https://lore.kernel.org/all/1ebb82ea-4b6c-4496-b7c0-17d4168d8ddf@ti.com/
Test log: https://gist.github.com/h-shenoy/3975156baf403a0ff8dbcce5b49b2b89
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 ed87a3970f83..9abed2ece9b0 100644
--- a/drivers/phy/cadence/cdns-dphy.c
+++ b/drivers/phy/cadence/cdns-dphy.c
@@ -139,7 +139,7 @@ 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;
@@ -149,6 +149,8 @@ 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,
--
2.34.1
Powered by blists - more mailing lists