From: "Noralf Trønnes via B4 Relay" <devnull+noralf.tronnes.org@kernel.org>
To: Neil Armstrong <neil.armstrong@linaro.org>,
Jessica Zhang <quic_jesszhan@quicinc.com>,
Sam Ravnborg <sam@ravnborg.org>,
David Airlie <airlied@gmail.com>,
Daniel Vetter <daniel@ffwll.ch>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Kamlesh Gurudasani" <kamlesh.gurudasani@gmail.com>,
"Tommaso Merciai" <tommaso.merciai@amarulasolutions.com>,
"Noralf Trønnes" <noralf@tronnes.org>
Subject: [PATCH 3/5] drm/mipi-dbi: Make bits per word configurable for pixel transfers
Date: Tue, 07 May 2024 11:57:28 +0200 [thread overview]
Message-ID: <20240507-panel-mipi-dbi-rgb666-v1-3-6799234afa3e@tronnes.org> (raw)
In-Reply-To: <20240507-panel-mipi-dbi-rgb666-v1-0-6799234afa3e@tronnes.org>
From: Noralf Trønnes <noralf@tronnes.org>
This prepares for supporting other pixel formats than RGB565.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
drivers/gpu/drm/drm_mipi_dbi.c | 14 ++++++++++----
include/drm/drm_mipi_dbi.h | 5 +++++
2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
index fa8aba6dc81c..77f8a828d6e0 100644
--- a/drivers/gpu/drm/drm_mipi_dbi.c
+++ b/drivers/gpu/drm/drm_mipi_dbi.c
@@ -1079,7 +1079,7 @@ static int mipi_dbi_typec1_command_read(struct mipi_dbi *dbi, u8 *cmd,
static int mipi_dbi_typec1_command(struct mipi_dbi *dbi, u8 *cmd,
u8 *parameters, size_t num)
{
- unsigned int bpw = (*cmd == MIPI_DCS_WRITE_MEMORY_START) ? 16 : 8;
+ unsigned int bpw = 8;
int ret;
if (mipi_dbi_command_is_read(dbi, *cmd))
@@ -1091,6 +1091,9 @@ static int mipi_dbi_typec1_command(struct mipi_dbi *dbi, u8 *cmd,
if (ret || !num)
return ret;
+ if (*cmd == MIPI_DCS_WRITE_MEMORY_START)
+ bpw = dbi->write_memory_bpw;
+
return mipi_dbi_spi1_transfer(dbi, 1, parameters, num, bpw);
}
@@ -1184,8 +1187,8 @@ static int mipi_dbi_typec3_command(struct mipi_dbi *dbi, u8 *cmd,
if (ret || !num)
return ret;
- if (*cmd == MIPI_DCS_WRITE_MEMORY_START && !dbi->swap_bytes)
- bpw = 16;
+ if (*cmd == MIPI_DCS_WRITE_MEMORY_START)
+ bpw = dbi->write_memory_bpw;
spi_bus_lock(spi->controller);
gpiod_set_value_cansleep(dbi->dc, 1);
@@ -1256,12 +1259,15 @@ int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi,
dbi->spi = spi;
dbi->read_commands = mipi_dbi_dcs_read_commands;
+ dbi->write_memory_bpw = 16;
if (dc) {
dbi->command = mipi_dbi_typec3_command;
dbi->dc = dc;
- if (!spi_is_bpw_supported(spi, 16))
+ if (!spi_is_bpw_supported(spi, 16)) {
+ dbi->write_memory_bpw = 8;
dbi->swap_bytes = true;
+ }
} else {
dbi->command = mipi_dbi_typec1_command;
dbi->tx_buf9_len = SZ_16K;
diff --git a/include/drm/drm_mipi_dbi.h b/include/drm/drm_mipi_dbi.h
index e8e0f8d39f3a..b36596efdcc3 100644
--- a/include/drm/drm_mipi_dbi.h
+++ b/include/drm/drm_mipi_dbi.h
@@ -56,6 +56,11 @@ struct mipi_dbi {
*/
struct spi_device *spi;
+ /**
+ * @write_memory_bpw: Bits per word used on a MIPI_DCS_WRITE_MEMORY_START transfer
+ */
+ unsigned int write_memory_bpw;
+
/**
* @dc: Optional D/C gpio.
*/
--
2.45.0
next prev parent reply other threads:[~2024-05-07 9:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-07 9:57 [PATCH 0/5] drm/tiny: panel-mipi-dbi: Support 18 bits per color RGB666 Noralf Trønnes via B4 Relay
2024-05-07 9:57 ` [PATCH 1/5] dt-bindings: display: panel: mipi-dbi-spi: Add a pixel format property Noralf Trønnes via B4 Relay
2024-05-07 20:28 ` Rob Herring
2024-05-07 9:57 ` [PATCH 2/5] drm/mipi-dbi: Remove mipi_dbi_machine_little_endian() Noralf Trønnes via B4 Relay
2024-05-07 9:57 ` Noralf Trønnes via B4 Relay [this message]
2024-05-07 9:57 ` [PATCH 4/5] drm/mipi-dbi: Add support for DRM_FORMAT_RGB888 Noralf Trønnes via B4 Relay
2024-05-07 9:57 ` [PATCH 5/5] drm/tiny: panel-mipi-dbi: Support the pixel format property Noralf Trønnes via B4 Relay
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