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h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=pB5M/JtFvGYNtIaQ+FBlqp6jxk5A12w5bjS7Qw5Y9cc=; b=ajMHzJHbKdmKIPfStkLbKzzTsFrfpzv3qtDdEEu/ITqw7gqcd/1y6fm/zLHMv4rq4k QEDzrb90M+HqhUyoQjuwzCfUr2+0eCSYj+tBfjETZBK2AdvQ72ouZXFBr47hdK+WI03p OQo9/dbNkAfxGC7MGt/rpVYrGZVTQUMLXZou1GNWyPUleSXdu8GCZueJWYbR2R5O0g5T opDkfDNZab53q5Kh/YKsSIIDSDAdCnFOWA/kKSWPc/COCLuQIo4zCZfcWYJqlfRGtlXm AFntpUB/vlxqiolijSqxVjcPptfkEP5DONrs9qRzA1oQTgkrOSpCa4Solup4x6SyfEyv ujpw== X-Gm-Message-State: APjAAAXKsnNTmrklOCnQUMs0BwB98NMmrmXbedHmZ4rXh9OrdRpUwziz 6xwEfOeioxtn4YselW/U4MTNj2WXdp6TcU7509iswQ== X-Google-Smtp-Source: APXvYqy6+HKeBGlLS94t+x2qypNjHzoNPSLQNwi0qLsRbBbXJmWv2H1EB5GfPjhe9izma1Oua6auNZlXxdL5WZc7ixA= X-Received: by 2002:a5d:4941:: with SMTP id r1mr59278276wrs.225.1563615781775; Sat, 20 Jul 2019 02:43:01 -0700 (PDT) MIME-Version: 1.0 References: <20190614142406.ybdiqfppo5mc5bgq@flea> <20190625144930.5hegt6bkzqzykjid@flea> <20190703114933.u3x4ej3v7ocewvif@flea> <20190711100100.cty3s6rs3w27low6@flea> <20190720065830.zn3txpyduakywcva@flea> <20190720093202.6fn6xmhvsgawscnu@flea> In-Reply-To: <20190720093202.6fn6xmhvsgawscnu@flea> From: Michael Nazzareno Trimarchi Date: Sat, 20 Jul 2019 11:42:50 +0200 Message-ID: Subject: Re: [PATCH v6 11/22] clk: sunxi-ng: a64: Add minimum rate for PLL_MIPI To: Maxime Ripard X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190720_024304_623531_A3770A6D X-CRM114-Status: GOOD ( 35.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree , David Airlie , Michael Turquette , linux-sunxi , linux-kernel , dri-devel , Chen-Yu Tsai , Rob Herring , Jagan Teki , Daniel Vetter , linux-amarula , linux-clk , linux-arm-kernel Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi On Sat, Jul 20, 2019 at 11:32 AM Maxime Ripard wrote: > > On Sat, Jul 20, 2019 at 12:46:27PM +0530, Jagan Teki wrote: > > On Sat, Jul 20, 2019 at 12:28 PM Maxime Ripard > > wrote: > > > > > > On Thu, Jul 11, 2019 at 07:43:16PM +0200, Michael Nazzareno Trimarchi wrote: > > > > > > tcon-pixel clock is the rate that you want to achive on display side > > > > > > and if you have 4 lanes 32bit or lanes and different bit number that > > > > > > you need to have a clock that is able to put outside bits and speed > > > > > > equal to pixel-clock * bits / lanes. so If you want a pixel-clock of > > > > > > 40 mhz and you have 32bits and 4 lanes you need to have a clock of > > > > > > 40 * 32 / 4 in no-burst mode. I think that this is done but most of > > > > > > the display. > > > > > > > > > > So this is what the issue is then? > > > > > > > > > > This one does make sense, and you should just change the rate in the > > > > > call to clk_set_rate in sun4i_tcon0_mode_set_cpu. > > > > > > > > > > I'm still wondering why that hasn't been brought up in either the > > > > > discussion or the commit log before though. > > > > > > > > > Something like this? > > > > > > > > drivers/gpu/drm/sun4i/sun4i_tcon.c | 20 +++++++++++--------- > > > > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 2 -- > > > > 2 files changed, 11 insertions(+), 11 deletions(-) > > > > > > > > diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c > > > > b/drivers/gpu/drm/sun4i/sun4i_tcon.c > > > > index 64c43ee6bd92..42560d5c327c 100644 > > > > --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c > > > > +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c > > > > @@ -263,10 +263,11 @@ static int sun4i_tcon_get_clk_delay(const struct > > > > drm_display_mode *mode, > > > > } > > > > > > > > static void sun4i_tcon0_mode_set_common(struct sun4i_tcon *tcon, > > > > - const struct drm_display_mode *mode) > > > > + const struct drm_display_mode *mode, > > > > + u32 tcon_mul) > > > > { > > > > /* Configure the dot clock */ > > > > - clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); > > > > + clk_set_rate(tcon->dclk, mode->crtc_clock * tcon_mul * 1000); > > > > > > > > /* Set the resolution */ > > > > regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, > > > > @@ -335,12 +336,13 @@ static void sun4i_tcon0_mode_set_cpu(struct > > > > sun4i_tcon *tcon, > > > > u8 bpp = mipi_dsi_pixel_format_to_bpp(device->format); > > > > u8 lanes = device->lanes; > > > > u32 block_space, start_delay; > > > > - u32 tcon_div; > > > > + u32 tcon_div, tcon_mul; > > > > > > > > - tcon->dclk_min_div = SUN6I_DSI_TCON_DIV; > > > > - tcon->dclk_max_div = SUN6I_DSI_TCON_DIV; > > > > + tcon->dclk_min_div = 4; > > > > + tcon->dclk_max_div = 127; > > > > > > > > - sun4i_tcon0_mode_set_common(tcon, mode); > > > > + tcon_mul = bpp / lanes; > > > > + sun4i_tcon0_mode_set_common(tcon, mode, tcon_mul); > > > > > > > > /* Set dithering if needed */ > > > > sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); > > > > @@ -366,7 +368,7 @@ static void sun4i_tcon0_mode_set_cpu(struct > > > > sun4i_tcon *tcon, > > > > */ > > > > regmap_read(tcon->regs, SUN4I_TCON0_DCLK_REG, &tcon_div); > > > > tcon_div &= GENMASK(6, 0); > > > > - block_space = mode->htotal * bpp / (tcon_div * lanes); > > > > + block_space = mode->htotal * tcon_div * tcon_mul; > > > > block_space -= mode->hdisplay + 40; > > > > > > > > regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI0_REG, > > > > @@ -408,7 +410,7 @@ static void sun4i_tcon0_mode_set_lvds(struct > > > > sun4i_tcon *tcon, > > > > > > > > tcon->dclk_min_div = 7; > > > > tcon->dclk_max_div = 7; > > > > - sun4i_tcon0_mode_set_common(tcon, mode); > > > > + sun4i_tcon0_mode_set_common(tcon, mode, 1); > > > > > > > > /* Set dithering if needed */ > > > > sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); > > > > @@ -487,7 +489,7 @@ static void sun4i_tcon0_mode_set_rgb(struct > > > > sun4i_tcon *tcon, > > > > > > > > tcon->dclk_min_div = 6; > > > > tcon->dclk_max_div = 127; > > > > - sun4i_tcon0_mode_set_common(tcon, mode); > > > > + sun4i_tcon0_mode_set_common(tcon, mode, 1); > > > > > > > > /* Set dithering if needed */ > > > > sun4i_tcon0_mode_set_dithering(tcon, connector); > > > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h > > > > b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h > > > > index 5c3ad5be0690..a07090579f84 100644 > > > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h > > > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h > > > > @@ -13,8 +13,6 @@ > > > > #include > > > > #include > > > > > > > > -#define SUN6I_DSI_TCON_DIV 4 > > > > - > > > > struct sun6i_dsi { > > > > struct drm_connector connector; > > > > struct drm_encoder encoder; > > > > > > I had more something like this in mind: > > > http://code.bulix.org/nlp5a4-803511 > > > > Worth to look at it. was it working on your panel? meanwhile I will check it. > > I haven't tested it. > > > We have updated with below change [1], seems working on but is > > actually checking the each divider as before start with 4... till 127. > > > > This new approach, is start looking the best divider from 4.. based on > > the idea vs rounded it will ended up best divider like [2] > > But why? > > I mean, it's not like it's the first time I'm asking this... > > If the issue is what Micheal described, then the divider has nothing > to do with it. We've had that discussion over and over again. > Sorry to quick copy and paste but my idea is somenthing like: --- drivers/gpu/drm/sun4i/sun4i_dotclock.c | 5 ++++- drivers/gpu/drm/sun4i/sun4i_tcon.c | 9 ++++++--- drivers/gpu/drm/sun4i/sun4i_tcon.h | 1 + drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 2 -- 4 files changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun4i_dotclock.c b/drivers/gpu/drm/sun4i/sun4i_dotclock.c index 417ade3d2565..b8be67cbb037 100644 --- a/drivers/gpu/drm/sun4i/sun4i_dotclock.c +++ b/drivers/gpu/drm/sun4i/sun4i_dotclock.c @@ -74,12 +74,15 @@ static long sun4i_dclk_round_rate(struct clk_hw *hw, unsigned long rate, struct sun4i_tcon *tcon = dclk->tcon; unsigned long best_parent = 0; u8 best_div = 1; + u64 ideal = (u64)rate * tcon->dclk_mul; int i; for (i = tcon->dclk_min_div; i <= tcon->dclk_max_div; i++) { - u64 ideal = (u64)rate * i; unsigned long rounded; + if (!tcon->dclk_mul) + ideal = (u64)rate * i; + /* * ideal has overflowed the max value that can be stored in an * unsigned long, and every clk operation we might do on a diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 64c43ee6bd92..3301952bcf32 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -337,8 +337,9 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon, u32 block_space, start_delay; u32 tcon_div; - tcon->dclk_min_div = SUN6I_DSI_TCON_DIV; - tcon->dclk_max_div = SUN6I_DSI_TCON_DIV; + tcon->dclk_min_div = 4; + tcon->dclk_max_div = 127; + tcon->dclk_mul = bpp / lanes; sun4i_tcon0_mode_set_common(tcon, mode); @@ -366,7 +367,7 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon, */ regmap_read(tcon->regs, SUN4I_TCON0_DCLK_REG, &tcon_div); tcon_div &= GENMASK(6, 0); - block_space = mode->htotal * bpp / (tcon_div * lanes); + block_space = mode->htotal * tcon_div * tcon->dclk_mul; block_space -= mode->hdisplay + 40; regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI0_REG, @@ -408,6 +409,7 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon, tcon->dclk_min_div = 7; tcon->dclk_max_div = 7; + tcon->dclk_mul = 0; sun4i_tcon0_mode_set_common(tcon, mode); /* Set dithering if needed */ @@ -487,6 +489,7 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, tcon->dclk_min_div = 6; tcon->dclk_max_div = 127; + tcon->dclk_mul = 0; sun4i_tcon0_mode_set_common(tcon, mode); /* Set dithering if needed */ diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h index f9f1fe80b206..44b69533778e 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.h +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h @@ -248,6 +248,7 @@ struct sun4i_tcon { struct clk *dclk; u8 dclk_max_div; u8 dclk_min_div; + u8 dclk_mul; /* Reset control */ struct reset_control *lcd_rst; diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h index 5c3ad5be0690..a07090579f84 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h @@ -13,8 +13,6 @@ #include #include -#define SUN6I_DSI_TCON_DIV 4 - struct sun6i_dsi { struct drm_connector connector; struct drm_encoder encoder; -- 2.17.1 Michael > So you need to come with some argument and proof that the divider of > that clock need to change. Otherwise, stop trying to make that happen: > it won't. > > Maxime > > -- > Maxime Ripard, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com -- | Michael Nazzareno Trimarchi Amarula Solutions BV | | COO - Founder Cruquiuskade 47 | | +31(0)851119172 Amsterdam 1018 AM NL | | [`as] http://www.amarulasolutions.com | _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel