From: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx> [ Upstream commit fb25ca37317200fa97ea6b8952e07958f06da7a6 ] The VNCSI_IFMD register controls the data expansion mode and the channel routing between the CSI-2 receivers and VIN instances. According to the chip manual revision 2.20 not all fields are available for all the SoCs: - V3M, V3H and E3 do not support the DES1 field has they do not feature a CSI20 receiver. - D3 only supports parallel input, and the whole register shall always be written as 0. Inspect the per-SoC channel routing table where the available CSI-2 instances are reported and configure VNCSI_IFMD accordingly. This patch supports this BSP change commit: https://github.com/renesas-rcar/linux-bsp/commit/f54697394457 ("media: rcar-vin: Fix VnCSI_IFMD register access for r8a77990") [hverkuil: replace BSP commit ID with BSP URL] Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx> Suggested-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx> Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/media/platform/rcar-vin/rcar-dma.c | 25 +++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c index e5f6360801082..5605a42f6de54 100644 --- a/drivers/media/platform/rcar-vin/rcar-dma.c +++ b/drivers/media/platform/rcar-vin/rcar-dma.c @@ -1330,7 +1330,9 @@ int rvin_dma_register(struct rvin_dev *vin, int irq) */ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel) { - u32 ifmd, vnmc; + const struct rvin_group_route *route; + u32 ifmd = 0; + u32 vnmc; int ret; ret = pm_runtime_get_sync(vin->dev); @@ -1343,9 +1345,26 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel) vnmc = rvin_read(vin, VNMC_REG); rvin_write(vin, vnmc & ~VNMC_VUP, VNMC_REG); - ifmd = VNCSI_IFMD_DES1 | VNCSI_IFMD_DES0 | VNCSI_IFMD_CSI_CHSEL(chsel); + /* + * Set data expansion mode to "pad with 0s" by inspecting the routes + * table to find out which bit fields are available in the IFMD + * register. IFMD_DES1 controls data expansion mode for CSI20/21, + * IFMD_DES0 controls data expansion mode for CSI40/41. + */ + for (route = vin->info->routes; route->mask; route++) { + if (route->csi == RVIN_CSI20 || route->csi == RVIN_CSI21) + ifmd |= VNCSI_IFMD_DES1; + else + ifmd |= VNCSI_IFMD_DES0; - rvin_write(vin, ifmd, VNCSI_IFMD_REG); + if (ifmd == (VNCSI_IFMD_DES0 | VNCSI_IFMD_DES1)) + break; + } + + if (ifmd) { + ifmd |= VNCSI_IFMD_CSI_CHSEL(chsel); + rvin_write(vin, ifmd, VNCSI_IFMD_REG); + } vin_dbg(vin, "Set IFMD 0x%x\n", ifmd); -- 2.27.0
