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hw/arm/bcm2835_property: Add support for RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS 

In more recent Raspbian OS Linux kernels, the fb driver gives up
immediately if RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS fails or no
displays are reported.

This change simply always reports one display. It makes bcm2835_fb work
again with these more recent kernels.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Enrik Berkhan <Enrik.Berkhan@inka.de>
Message-Id: <20220812143519.59134-1-Enrik.Berkhan@inka.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Enrik Berkhan 2022-08-12 16:35:19 +02:00 committed by Richard Henderson
parent 3b16766b5a
commit 3b9a030e84
1 changed files with 4 additions and 0 deletions
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4
hw/misc/bcm2835_property.c
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@ -270,6 +270,10 @@ static void bcm2835_property_mbox_push(BCM2835PropertyState *s, uint32_t value)
stl_le_phys(&s->dma_as, value + 12, 0);
resplen = 4;
break;
case 0x00040013: /* Get number of displays */
stl_le_phys(&s->dma_as, value + 12, 1);
resplen = 4;
break;
case 0x00060001: /* Get DMA channels */
/* channels 2-5 */