The D-PHY specification (v1.2) explicitly mentions that the T-CLK-PRE
parameter's unit is Unit Interval(UI) and the minimum value is 8. Also,
kernel doc of the 'clk_pre' member of struct phy_configure_opts_mipi_dphy
mentions that it should be in UI. However, the dphy core driver wrongly
sets 'clk_pre' to 8000, which seems to hint that it's in picoseconds.
And, the kernel doc of the 'clk_pre' member wrongly says the minimum value
is '8 UI', instead of 8.
So, let's fix both the dphy core driver and the kernel doc of the 'clk_pre'
member to correctly reflect the T-CLK-PRE parameter's unit and the minimum
value according to the D-PHY specification.
I'm assuming that all impacted custom drivers shall program values in
TxByteClkHS cycles into hardware for the T-CLK-PRE parameter. The D-PHY
specification mentions that the frequency of TxByteClkHS is exactly 1/8
the High-Speed(HS) bit rate(each HS bit consumes one UI). So, relevant
custom driver code is changed to program those values as
DIV_ROUND_UP(cfg->clk_pre, BITS_PER_BYTE), then.
Note that I've only tested the patch with RM67191 DSI panel on i.MX8mq EVK.
Help is needed to test with other i.MX8mq, Meson and Rockchip platforms,
as I don't have the hardwares.
Fixes: 2ed869990e14 ("phy: Add MIPI D-PHY configuration options")
Cc: Andrzej Hajda <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Robert Foss <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Kishon Vijay Abraham I <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Kevin Hilman <[email protected]>
Cc: Jerome Brunet <[email protected]>
Cc: Martin Blumenstingl <[email protected]>
Cc: Heiko Stuebner <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Guido Günther <[email protected]>
Cc: Wyon Bi <[email protected]>
Tested-by: Liu Ying <[email protected]> # RM67191 DSI panel on i.MX8mq EVK
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]> # for phy-meson-axg-mipi-dphy.c
Tested-by: Neil Armstrong <[email protected]> # for phy-meson-axg-mipi-dphy.c
Tested-by: Guido Günther <[email protected]> # Librem 5 (imx8mq) with it's rather picky panel
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Liu Ying <[email protected]>
---
v2->v3:
* Drop D-PHY documentation change. (Laurent)
* Collect R-b tags and T-b tags.
* Cc Wyon.
v1->v2:
* Use BITS_PER_BYTE macro. (Andrzej)
* Drop dsi argument from ui2bc() in nwl-dsi.c.
drivers/gpu/drm/bridge/nwl-dsi.c | 12 +++++-------
drivers/phy/amlogic/phy-meson-axg-mipi-dphy.c | 3 ++-
drivers/phy/phy-core-mipi-dphy.c | 4 ++--
drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c | 3 ++-
4 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index a7389a0facfb..af07eeb47ca0 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -7,6 +7,7 @@
*/
#include <linux/bitfield.h>
+#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/math64.h>
@@ -196,12 +197,9 @@ static u32 ps2bc(struct nwl_dsi *dsi, unsigned long long ps)
/*
* ui2bc - UI time periods to byte clock cycles
*/
-static u32 ui2bc(struct nwl_dsi *dsi, unsigned long long ui)
+static u32 ui2bc(unsigned int ui)
{
- u32 bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
-
- return DIV64_U64_ROUND_UP(ui * dsi->lanes,
- dsi->mode.clock * 1000 * bpp);
+ return DIV_ROUND_UP(ui, BITS_PER_BYTE);
}
/*
@@ -232,12 +230,12 @@ static int nwl_dsi_config_host(struct nwl_dsi *dsi)
}
/* values in byte clock cycles */
- cycles = ui2bc(dsi, cfg->clk_pre);
+ cycles = ui2bc(cfg->clk_pre);
DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_t_pre: 0x%x\n", cycles);
nwl_dsi_write(dsi, NWL_DSI_CFG_T_PRE, cycles);
cycles = ps2bc(dsi, cfg->lpx + cfg->clk_prepare + cfg->clk_zero);
DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_tx_gap (pre): 0x%x\n", cycles);
- cycles += ui2bc(dsi, cfg->clk_pre);
+ cycles += ui2bc(cfg->clk_pre);
DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_t_post: 0x%x\n", cycles);
nwl_dsi_write(dsi, NWL_DSI_CFG_T_POST, cycles);
cycles = ps2bc(dsi, cfg->hs_exit);
diff --git a/drivers/phy/amlogic/phy-meson-axg-mipi-dphy.c b/drivers/phy/amlogic/phy-meson-axg-mipi-dphy.c
index cd2332bf0e31..fdbd64c03e12 100644
--- a/drivers/phy/amlogic/phy-meson-axg-mipi-dphy.c
+++ b/drivers/phy/amlogic/phy-meson-axg-mipi-dphy.c
@@ -9,6 +9,7 @@
#include <linux/bitfield.h>
#include <linux/bitops.h>
+#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
@@ -250,7 +251,7 @@ static int phy_meson_axg_mipi_dphy_power_on(struct phy *phy)
(DIV_ROUND_UP(priv->config.clk_zero, temp) << 16) |
(DIV_ROUND_UP(priv->config.clk_prepare, temp) << 24));
regmap_write(priv->regmap, MIPI_DSI_CLK_TIM1,
- DIV_ROUND_UP(priv->config.clk_pre, temp));
+ DIV_ROUND_UP(priv->config.clk_pre, BITS_PER_BYTE));
regmap_write(priv->regmap, MIPI_DSI_HS_TIM,
DIV_ROUND_UP(priv->config.hs_exit, temp) |
diff --git a/drivers/phy/phy-core-mipi-dphy.c b/drivers/phy/phy-core-mipi-dphy.c
index 288c9c67aa74..ccb4045685cd 100644
--- a/drivers/phy/phy-core-mipi-dphy.c
+++ b/drivers/phy/phy-core-mipi-dphy.c
@@ -36,7 +36,7 @@ int phy_mipi_dphy_get_default_config(unsigned long pixel_clock,
cfg->clk_miss = 0;
cfg->clk_post = 60000 + 52 * ui;
- cfg->clk_pre = 8000;
+ cfg->clk_pre = 8;
cfg->clk_prepare = 38000;
cfg->clk_settle = 95000;
cfg->clk_term_en = 0;
@@ -97,7 +97,7 @@ int phy_mipi_dphy_config_validate(struct phy_configure_opts_mipi_dphy *cfg)
if (cfg->clk_post < (60000 + 52 * ui))
return -EINVAL;
- if (cfg->clk_pre < 8000)
+ if (cfg->clk_pre < 8)
return -EINVAL;
if (cfg->clk_prepare < 38000 || cfg->clk_prepare > 95000)
diff --git a/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c b/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
index 347dc79a18c1..630e01b5c19b 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
@@ -5,6 +5,7 @@
* Author: Wyon Bi <[email protected]>
*/
+#include <linux/bits.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/iopoll.h>
@@ -364,7 +365,7 @@ static void inno_dsidphy_mipi_mode_enable(struct inno_dsidphy *inno)
* The value of counter for HS Tclk-pre
* Tclk-pre = Tpin_txbyteclkhs * value
*/
- clk_pre = DIV_ROUND_UP(cfg->clk_pre, t_txbyteclkhs);
+ clk_pre = DIV_ROUND_UP(cfg->clk_pre, BITS_PER_BYTE);
/*
* The value of counter for HS Tlpx Time
--
2.25.1