Re: [PATCHv2 05/56] drm/omap: dsi: use MIPI_DSI_FMT_* instead of OMAP_DSS_DSI_FMT_*

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Sebastian Reichel <sebastian.reichel@collabora.com>
Cc: Sebastian Reichel <sre@kernel.org>,
	Tomi Valkeinen <tomi.valkeinen@ti.com>,
	Tony Lindgren <tony@atomide.com>,
	Merlijn Wajer <merlijn@wizzup.org>,
	"H. Nikolaus Schaller" <hns@goldelico.com>,
	Rob Herring <robh@kernel.org>,
	linux-omap@vger.kernel.org, dri-devel@lists.freedesktop.org,
	kernel@collabora.com
Subject: Re: [PATCHv2 05/56] drm/omap: dsi: use MIPI_DSI_FMT_* instead of OMAP_DSS_DSI_FMT_*
Date: Tue, 25 Feb 2020 15:58:23 +0200	[thread overview]
Message-ID: <20200225135823.GD4764@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20200224232126.3385250-6-sebastian.reichel@collabora.com>

Hi Sebastian,

Thank you for the patch.

On Tue, Feb 25, 2020 at 12:20:35AM +0100, Sebastian Reichel wrote:
> This replaces OMAP specific enum for pixel format with
> common implementation.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  .../gpu/drm/omapdrm/displays/panel-dsi-cm.c   |  2 +-
>  drivers/gpu/drm/omapdrm/dss/dsi.c             | 49 +++++++------------
>  drivers/gpu/drm/omapdrm/dss/omapdss.h         | 10 +---
>  3 files changed, 20 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> index e7fe5d702337..e6ebfc35243e 100644
> --- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> +++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> @@ -595,7 +595,7 @@ static int dsicm_power_on(struct panel_drv_data *ddata)
>  	int r;
>  	struct omap_dss_dsi_config dsi_config = {
>  		.mode = OMAP_DSS_DSI_CMD_MODE,
> -		.pixel_format = OMAP_DSS_DSI_FMT_RGB888,
> +		.pixel_format = MIPI_DSI_FMT_RGB888,
>  		.vm = &ddata->vm,
>  		.hs_clk_min = 150000000,
>  		.hs_clk_max = 300000000,
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index 8c39823a8295..bb2548d091ef 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -34,6 +34,7 @@
>  #include <linux/sys_soc.h>
>  
>  #include <video/mipi_display.h>
> +#include <drm/drm_mipi_dsi.h>

Maybe sort those two headers alphabetically ?

>  
>  #include "omapdss.h"
>  #include "dss.h"
> @@ -410,7 +411,7 @@ struct dsi_data {
>  
>  	struct dss_lcd_mgr_config mgr_config;
>  	struct videomode vm;
> -	enum omap_dss_dsi_pixel_format pix_fmt;
> +	enum mipi_dsi_pixel_format pix_fmt;
>  	enum omap_dss_dsi_mode mode;
>  	struct omap_dss_dsi_videomode_timings vm_timings;
>  
> @@ -514,22 +515,6 @@ static inline bool wait_for_bit_change(struct dsi_data *dsi,
>  	return false;
>  }
>  
> -static u8 dsi_get_pixel_size(enum omap_dss_dsi_pixel_format fmt)
> -{
> -	switch (fmt) {
> -	case OMAP_DSS_DSI_FMT_RGB888:
> -	case OMAP_DSS_DSI_FMT_RGB666:
> -		return 24;
> -	case OMAP_DSS_DSI_FMT_RGB666_PACKED:
> -		return 18;
> -	case OMAP_DSS_DSI_FMT_RGB565:
> -		return 16;
> -	default:
> -		BUG();

Removing a BUG() is really nice :-) I suppose this never happened, or we
would have heard of it. Still, is there a top-level location where we
could validate the format (assuming it is still used at the end of this
series) ? mipi_dsi_pixel_format_to_bpp() returns -EINVAL if the format
is invalid, and we don't check for that through the code . It doesn't
have to be handled in this patch, it can be done later in the series as
you keep reworking the code.

> -		return 0;
> -	}
> -}
> -
>  #ifdef DSI_PERF_MEASURE
>  static void dsi_perf_mark_setup(struct dsi_data *dsi)
>  {
> @@ -3239,7 +3224,7 @@ static void dsi_config_vp_num_line_buffers(struct dsi_data *dsi)
>  	int num_line_buffers;
>  
>  	if (dsi->mode == OMAP_DSS_DSI_VIDEO_MODE) {
> -		int bpp = dsi_get_pixel_size(dsi->pix_fmt);
> +		int bpp = mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt);
>  		const struct videomode *vm = &dsi->vm;
>  		/*
>  		 * Don't use line buffers if width is greater than the video
> @@ -3370,7 +3355,7 @@ static void dsi_config_cmd_mode_interleaving(struct dsi_data *dsi)
>  	int tclk_trail, ths_exit, exiths_clk;
>  	bool ddr_alwon;
>  	const struct videomode *vm = &dsi->vm;
> -	int bpp = dsi_get_pixel_size(dsi->pix_fmt);
> +	int bpp = mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt);
>  	int ndl = dsi->num_lanes_used - 1;
>  	int dsi_fclk_hsdiv = dsi->user_dsi_cinfo.mX[HSDIV_DSI] + 1;
>  	int hsa_interleave_hs = 0, hsa_interleave_lp = 0;
> @@ -3498,7 +3483,7 @@ static int dsi_proto_config(struct dsi_data *dsi)
>  	dsi_set_lp_rx_timeout(dsi, 0x1fff, true, true);
>  	dsi_set_hs_tx_timeout(dsi, 0x1fff, true, true);
>  
> -	switch (dsi_get_pixel_size(dsi->pix_fmt)) {
> +	switch (mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt)) {
>  	case 16:
>  		buswidth = 0;
>  		break;
> @@ -3619,7 +3604,7 @@ static void dsi_proto_timings(struct dsi_data *dsi)
>  		int window_sync = dsi->vm_timings.window_sync;
>  		bool hsync_end;
>  		const struct videomode *vm = &dsi->vm;
> -		int bpp = dsi_get_pixel_size(dsi->pix_fmt);
> +		int bpp = mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt);
>  		int tl, t_he, width_bytes;
>  
>  		hsync_end = dsi->vm_timings.trans_mode == OMAP_DSS_DSI_PULSE_MODE;
> @@ -3726,7 +3711,7 @@ static int dsi_configure_pins(struct omap_dss_device *dssdev,
>  static int dsi_enable_video_output(struct omap_dss_device *dssdev, int channel)
>  {
>  	struct dsi_data *dsi = to_dsi_data(dssdev);
> -	int bpp = dsi_get_pixel_size(dsi->pix_fmt);
> +	int bpp = mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt);
>  	u8 data_type;
>  	u16 word_count;
>  	int r;
> @@ -3737,16 +3722,16 @@ static int dsi_enable_video_output(struct omap_dss_device *dssdev, int channel)
>  
>  	if (dsi->mode == OMAP_DSS_DSI_VIDEO_MODE) {
>  		switch (dsi->pix_fmt) {
> -		case OMAP_DSS_DSI_FMT_RGB888:
> +		case MIPI_DSI_FMT_RGB888:
>  			data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24;
>  			break;
> -		case OMAP_DSS_DSI_FMT_RGB666:
> +		case MIPI_DSI_FMT_RGB666:
>  			data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
>  			break;
> -		case OMAP_DSS_DSI_FMT_RGB666_PACKED:
> +		case MIPI_DSI_FMT_RGB666_PACKED:
>  			data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18;
>  			break;
> -		case OMAP_DSS_DSI_FMT_RGB565:
> +		case MIPI_DSI_FMT_RGB565:
>  			data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16;
>  			break;
>  		default:
> @@ -3824,7 +3809,7 @@ static void dsi_update_screen_dispc(struct dsi_data *dsi)
>  
>  	dsi_vc_config_source(dsi, channel, DSI_VC_SOURCE_VP);
>  
> -	bytespp	= dsi_get_pixel_size(dsi->pix_fmt) / 8;
> +	bytespp	= mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt) / 8;
>  	bytespl = w * bytespp;
>  	bytespf = bytespl * h;
>  
> @@ -3954,7 +3939,7 @@ static int dsi_update(struct omap_dss_device *dssdev, int channel,
>  
>  #ifdef DSI_PERF_MEASURE
>  	dsi->update_bytes = dw * dh *
> -		dsi_get_pixel_size(dsi->pix_fmt) / 8;
> +		mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt) / 8;
>  #endif
>  	dsi_update_screen_dispc(dsi);
>  
> @@ -4015,7 +4000,7 @@ static int dsi_display_init_dispc(struct dsi_data *dsi)
>  
>  	dsi->mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
>  	dsi->mgr_config.video_port_width =
> -			dsi_get_pixel_size(dsi->pix_fmt);
> +			mipi_dsi_pixel_format_to_bpp(dsi->pix_fmt);
>  	dsi->mgr_config.lcden_sig_polarity = 0;
>  
>  	dss_mgr_set_lcd_config(&dsi->output, &dsi->mgr_config);
> @@ -4353,7 +4338,7 @@ static bool dsi_cm_calc(struct dsi_data *dsi,
>  	unsigned long pck, txbyteclk;
>  
>  	clkin = clk_get_rate(dsi->pll.clkin);
> -	bitspp = dsi_get_pixel_size(cfg->pixel_format);
> +	bitspp = mipi_dsi_pixel_format_to_bpp(cfg->pixel_format);
>  	ndl = dsi->num_lanes_used - 1;
>  
>  	/*
> @@ -4386,7 +4371,7 @@ static bool dsi_vm_calc_blanking(struct dsi_clk_calc_ctx *ctx)
>  {
>  	struct dsi_data *dsi = ctx->dsi;
>  	const struct omap_dss_dsi_config *cfg = ctx->config;
> -	int bitspp = dsi_get_pixel_size(cfg->pixel_format);
> +	int bitspp = mipi_dsi_pixel_format_to_bpp(cfg->pixel_format);
>  	int ndl = dsi->num_lanes_used - 1;
>  	unsigned long hsclk = ctx->dsi_cinfo.clkdco / 4;
>  	unsigned long byteclk = hsclk / 4;
> @@ -4653,7 +4638,7 @@ static bool dsi_vm_calc(struct dsi_data *dsi,
>  	unsigned long pll_min;
>  	unsigned long pll_max;
>  	int ndl = dsi->num_lanes_used - 1;
> -	int bitspp = dsi_get_pixel_size(cfg->pixel_format);
> +	int bitspp = mipi_dsi_pixel_format_to_bpp(cfg->pixel_format);
>  	unsigned long byteclk_min;
>  
>  	clkin = clk_get_rate(dsi->pll.clkin);
> diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
> index b0424daaceed..53fea1cbbc2d 100644
> --- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
> +++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
> @@ -14,6 +14,7 @@
>  #include <linux/platform_data/omapdss.h>
>  #include <uapi/drm/drm_mode.h>

While at it, I would replace this with

#include <drm/drm_mode.h>

, add a blank line here, and keep the drm headers sorted alphabetically.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

>  #include <drm/drm_crtc.h>
> +#include <drm/drm_mipi_dsi.h>
>  
>  #define DISPC_IRQ_FRAMEDONE		(1 << 0)
>  #define DISPC_IRQ_VSYNC			(1 << 1)
> @@ -116,13 +117,6 @@ enum omap_dss_venc_type {
>  	OMAP_DSS_VENC_TYPE_SVIDEO,
>  };
>  
> -enum omap_dss_dsi_pixel_format {
> -	OMAP_DSS_DSI_FMT_RGB888,
> -	OMAP_DSS_DSI_FMT_RGB666,
> -	OMAP_DSS_DSI_FMT_RGB666_PACKED,
> -	OMAP_DSS_DSI_FMT_RGB565,
> -};
> -
>  enum omap_dss_dsi_mode {
>  	OMAP_DSS_DSI_CMD_MODE = 0,
>  	OMAP_DSS_DSI_VIDEO_MODE,
> @@ -210,7 +204,7 @@ struct omap_dss_dsi_videomode_timings {
>  
>  struct omap_dss_dsi_config {
>  	enum omap_dss_dsi_mode mode;
> -	enum omap_dss_dsi_pixel_format pixel_format;
> +	enum mipi_dsi_pixel_format pixel_format;
>  	const struct videomode *vm;
>  
>  	unsigned long hs_clk_min, hs_clk_max;

-- 
Regards,

Laurent Pinchart