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Date: Fri, 11 Aug 2023 19:33:32 +0300
From: Péter Ujfalusi <peter.ujfalusi@...il.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Francesco Dolcini <francesco@...cini.it>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Aradhya Bhatia <a-bhatia1@...com>
Subject: Re: [PATCH 07/11] drm/bridge: tc358768: Rename dsibclk to hsbyteclk
On 04/08/2023 13:44, Tomi Valkeinen wrote:
> The Toshiba documentation talks about HSByteClk when referring to the
> DSI HS byte clock, whereas the driver uses 'dsibclk' name. Also, in a
> few places the driver calculates the byte clock from the DSI clock, even
> if the byte clock is already available in a variable.
If you say so ;)
I don't have access to the documentation anymore.
>
> To align the driver with the documentation, change the 'dsibclk'
> variable to 'hsbyteclk'. This also make it easier to visually separate
> 'dsibclk' and 'dsiclk' variables.
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@...il.com>
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> ---
> drivers/gpu/drm/bridge/tc358768.c | 48 +++++++++++++++++++--------------------
> 1 file changed, 24 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
> index 3266c08d9bf1..db45b4a982c0 100644
> --- a/drivers/gpu/drm/bridge/tc358768.c
> +++ b/drivers/gpu/drm/bridge/tc358768.c
> @@ -604,7 +604,7 @@ static int tc358768_setup_pll(struct tc358768_priv *priv,
>
> dev_dbg(priv->dev, "PLL: refclk %lu, fbd %u, prd %u, frs %u\n",
> clk_get_rate(priv->refclk), fbd, prd, frs);
> - dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, DSIByteClk %u\n",
> + dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, HSByteClk %u\n",
> priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4);
> dev_dbg(priv->dev, "PLL: pclk %u (panel: %u)\n",
> tc358768_pll_to_pclk(priv, priv->dsiclk * 2),
> @@ -646,8 +646,8 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
> u32 val, val2, lptxcnt, hact, data_type;
> s32 raw_val;
> const struct drm_display_mode *mode;
> - u32 dsibclk_nsk, dsiclk_nsk, ui_nsk;
> - u32 dsiclk, dsibclk, video_start;
> + u32 hsbyteclk_nsk, dsiclk_nsk, ui_nsk;
> + u32 dsiclk, hsbyteclk, video_start;
> const u32 internal_delay = 40;
> int ret, i;
> struct videomode vm;
> @@ -678,7 +678,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
> drm_display_mode_to_videomode(mode, &vm);
>
> dsiclk = priv->dsiclk;
> - dsibclk = dsiclk / 4;
> + hsbyteclk = dsiclk / 4;
>
> /* Data Format Control Register */
> val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */
> @@ -730,67 +730,67 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
> tc358768_write(priv, TC358768_D0W_CNTRL + i * 4, 0x0000);
>
> /* DSI Timings */
> - dsibclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION,
> - dsibclk);
> + hsbyteclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION,
> + hsbyteclk);
> dsiclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION, dsiclk);
> ui_nsk = dsiclk_nsk / 2;
> dev_dbg(dev, "dsiclk_nsk: %u\n", dsiclk_nsk);
> dev_dbg(dev, "ui_nsk: %u\n", ui_nsk);
> - dev_dbg(dev, "dsibclk_nsk: %u\n", dsibclk_nsk);
> + dev_dbg(dev, "hsbyteclk_nsk: %u\n", hsbyteclk_nsk);
>
> /* LP11 > 100us for D-PHY Rx Init */
> - val = tc358768_ns_to_cnt(100 * 1000, dsibclk_nsk) - 1;
> + val = tc358768_ns_to_cnt(100 * 1000, hsbyteclk_nsk) - 1;
> dev_dbg(dev, "LINEINITCNT: %u\n", val);
> tc358768_write(priv, TC358768_LINEINITCNT, val);
>
> /* LPTimeCnt > 50ns */
> - val = tc358768_ns_to_cnt(50, dsibclk_nsk) - 1;
> + val = tc358768_ns_to_cnt(50, hsbyteclk_nsk) - 1;
> lptxcnt = val;
> dev_dbg(dev, "LPTXTIMECNT: %u\n", val);
> tc358768_write(priv, TC358768_LPTXTIMECNT, val);
>
> /* 38ns < TCLK_PREPARE < 95ns */
> - val = tc358768_ns_to_cnt(65, dsibclk_nsk) - 1;
> + val = tc358768_ns_to_cnt(65, hsbyteclk_nsk) - 1;
> dev_dbg(dev, "TCLK_PREPARECNT %u\n", val);
> /* TCLK_PREPARE + TCLK_ZERO > 300ns */
> val2 = tc358768_ns_to_cnt(300 - tc358768_to_ns(2 * ui_nsk),
> - dsibclk_nsk) - 2;
> + hsbyteclk_nsk) - 2;
> dev_dbg(dev, "TCLK_ZEROCNT %u\n", val2);
> val |= val2 << 8;
> tc358768_write(priv, TC358768_TCLK_HEADERCNT, val);
>
> /* TCLK_TRAIL > 60ns AND TEOT <= 105 ns + 12*UI */
> - raw_val = tc358768_ns_to_cnt(60 + tc358768_to_ns(2 * ui_nsk), dsibclk_nsk) - 5;
> + raw_val = tc358768_ns_to_cnt(60 + tc358768_to_ns(2 * ui_nsk), hsbyteclk_nsk) - 5;
> val = clamp(raw_val, 0, 127);
> dev_dbg(dev, "TCLK_TRAILCNT: %u\n", val);
> tc358768_write(priv, TC358768_TCLK_TRAILCNT, val);
>
> /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */
> val = 50 + tc358768_to_ns(4 * ui_nsk);
> - val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1;
> + val = tc358768_ns_to_cnt(val, hsbyteclk_nsk) - 1;
> dev_dbg(dev, "THS_PREPARECNT %u\n", val);
> /* THS_PREPARE + THS_ZERO > 145ns + 10*UI */
> - raw_val = tc358768_ns_to_cnt(145 - tc358768_to_ns(3 * ui_nsk), dsibclk_nsk) - 10;
> + raw_val = tc358768_ns_to_cnt(145 - tc358768_to_ns(3 * ui_nsk), hsbyteclk_nsk) - 10;
> val2 = clamp(raw_val, 0, 127);
> dev_dbg(dev, "THS_ZEROCNT %u\n", val2);
> val |= val2 << 8;
> tc358768_write(priv, TC358768_THS_HEADERCNT, val);
>
> /* TWAKEUP > 1ms in lptxcnt steps */
> - val = tc358768_ns_to_cnt(1020000, dsibclk_nsk);
> + val = tc358768_ns_to_cnt(1020000, hsbyteclk_nsk);
> val = val / (lptxcnt + 1) - 1;
> dev_dbg(dev, "TWAKEUP: %u\n", val);
> tc358768_write(priv, TC358768_TWAKEUP, val);
>
> /* TCLK_POSTCNT > 60ns + 52*UI */
> val = tc358768_ns_to_cnt(60 + tc358768_to_ns(52 * ui_nsk),
> - dsibclk_nsk) - 3;
> + hsbyteclk_nsk) - 3;
> dev_dbg(dev, "TCLK_POSTCNT: %u\n", val);
> tc358768_write(priv, TC358768_TCLK_POSTCNT, val);
>
> /* max(60ns + 4*UI, 8*UI) < THS_TRAILCNT < 105ns + 12*UI */
> raw_val = tc358768_ns_to_cnt(60 + tc358768_to_ns(18 * ui_nsk),
> - dsibclk_nsk) - 4;
> + hsbyteclk_nsk) - 4;
> val = clamp(raw_val, 0, 15);
> dev_dbg(dev, "THS_TRAILCNT: %u\n", val);
> tc358768_write(priv, TC358768_THS_TRAILCNT, val);
> @@ -804,11 +804,11 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
> (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) ? 0 : BIT(0));
>
> /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
> - val = tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk * 4);
> - val = tc358768_ns_to_cnt(val, dsibclk_nsk) / 4 - 1;
> + val = tc358768_to_ns((lptxcnt + 1) * hsbyteclk_nsk * 4);
> + val = tc358768_ns_to_cnt(val, hsbyteclk_nsk) / 4 - 1;
> dev_dbg(dev, "TXTAGOCNT: %u\n", val);
> - val2 = tc358768_ns_to_cnt(tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk),
> - dsibclk_nsk) - 2;
> + val2 = tc358768_ns_to_cnt(tc358768_to_ns((lptxcnt + 1) * hsbyteclk_nsk),
> + hsbyteclk_nsk) - 2;
> dev_dbg(dev, "RXTASURECNT: %u\n", val2);
> val = val << 16 | val2;
> tc358768_write(priv, TC358768_BTACNTRL1, val);
> @@ -831,13 +831,13 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
>
> /* hsw * byteclk * ndl / pclk */
> val = (u32)div_u64(vm.hsync_len *
> - ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
> + (u64)hsbyteclk * priv->dsi_lanes,
> vm.pixelclock);
> tc358768_write(priv, TC358768_DSI_HSW, val);
>
> /* hbp * byteclk * ndl / pclk */
> val = (u32)div_u64(vm.hback_porch *
> - ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
> + (u64)hsbyteclk * priv->dsi_lanes,
> vm.pixelclock);
> tc358768_write(priv, TC358768_DSI_HBPR, val);
> } else {
> @@ -856,7 +856,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
>
> /* (hsw + hbp) * byteclk * ndl / pclk */
> val = (u32)div_u64((vm.hsync_len + vm.hback_porch) *
> - ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
> + (u64)hsbyteclk * priv->dsi_lanes,
> vm.pixelclock);
> tc358768_write(priv, TC358768_DSI_HSW, val);
>
>
--
Péter
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